Showing papers in "Chinese Journal of Chemistry in 2005"
TL;DR: Mercurous chloride catalyzed Mannich condensation of terminal alkynes with secondary amines and aldehydes has been developed and generated β-aminoalkynes in good yields.
Abstract: Mercurous chloride catalyzed Mannich condensation of terminal alkynes with secondary amines and aldehydes has been developed. The reaction generated β-aminoalkynes in good yields.
96 citations
TL;DR: In this article, the micro-capsule obtained was a round, smooth and hollow microcapsule with its wall made up of innumerable small and solid sub-microcapsules with the core of fish oil.
Abstract: To improve the oxidative stability and application of fish oil, it was microencapsulated by simple coacervation followed by spray drying. Simple coacervation took place by adding malt dextrin into the emulsion of fish oil and hydroxypropyl methylcellulose (HPMC) solution. Influences of several process parameters on the microencapsulation were evaluated and the oxidative stability and microstructure of microcapsules were analyzed. Results showed that the coacervation could be observed only when dextrose equivalent value (DE value) of malt dextrin, concentration of HPMC solution and fish oil percentage in microcapsules were no more than 20, 5% and 40%, respectively. Moreover, microencapsulation efficiency was higher at HPMC solution concentration of 4% and fish oil percentage of less than 30%. The oxidative stability of fish oil was improved by the microencapsulation and done best in the case of replacing malt dextrin by 40% with acacia. Scanning electronic microscopic photographs showed that the microcapsule obtained was a round, smooth and hollow microcapsule with its wall made up of innumerable small and solid submicrocapsules with the core of fish oil.
65 citations
TL;DR: In this paper, a series of 10-methyl derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave heating without catalyst.
Abstract: A series of 10-methyl-1,2,3,4,5,6,7,8,9,10-decahydroacridine-1,8-dione derivatives were synthesized by one-pot reaction of aldehyde, dimedone or 1,3-cyclohexanedione and methylamine in glycol or water under microwave heating without catalyst. The method has the advantage of short routine and reaction time, high yields as well as friendly environment. And the reaction was not only suitable for aliphatic and aromatic monoaldehyde, but also for aromatic dialdehyde.
41 citations
TL;DR: In this article, a hydrogen-air fuel cell was constructed using ceramics as solid electrolyte and porous platinum as electrodes, and the cell performance at temperature from 600-1000 °C was examined.
Abstract: Ceramic BaCe0.8Ho0.2O3−α with orthorhombic perovskite structure was prepared by conventional solid state reaction, and its conductivity and ionic transport number were measured by ac impedance spectroscopy and gas concentration cell methods in the temperature range of 600–1000 °C in wet hydrogen and wet air, respectively. Using the ceramics as solid electrolyte and porous platinum as electrodes, the hydrogen-air fuel cell was constructed, and the cell performance at temperature from 600–1000 °C was examined. The results indicate that the specimen was a pure protonic conductor with the protonic transport number of 1 at temperature from 600–900 °C in wet hydrogen, a mixed conductor of proton and electron with the protonic transport number of 0.99 at 1000 °C. The electronic conduction could be neglected in this case, thus the total conductivity in wet hydrogen was approximately regarded as protonic conductivity. In wet air, the specimen was a mixed conductor of proton, oxide ion and electron hole. The protonic transport numbers were 0.01–0.09, and the oxide-ionic transport numbers were 0.27–0.32. The oxide ionic conductivity was increased with the increase of temperature, but the protonic conductivity displayed a maximum at 900 °C, due to the combined increase in mobility and depletion of the carriers. The fuel cell could work stably. At 1000 °C, the maximum short-circuit current density and power output density were 346 mA/cm2 and 80 mW/cm2, respectively.
37 citations
TL;DR: In this paper, the performance of the newly developed G3B3 and CBS-QB3 methods in calculating absolute bond dissociation energy (BDE) was assessed and it was found that these two methods could predict the BDE with an accuracy of about 8.4 kJ/mol.
Abstract: The performance of the newly developed G3B3 and CBS-QB3 methods in calculating absolute bond dissociation energy (BDE) was assessed. It was found that these two methods could predict the BDE with an accuracy of about 8.4 kJ/mol and therefore, they exhibited similar performance as the standard G3 and CBS-Q methods. On the other hand, it was demonstrated that the B3LYP method significantly underestimated the absolute BDE by 16.7–20.9 kJ/mol. This finding was valuable and timely because many researchers could use this relatively cheap method in studying radical reactions. Finally, 38 compounds were showed for which the theoretical BDE seriously deviated from the experimental data.
35 citations
TL;DR: In this article, the reaction of electron-deficient cyclopropane derivatives with benzoylmethylenetriphenylarsorane (2) and methoxycarbonylmethylene-triphenylarane (4) was found to form cis,trans-1-methoxy carbonyl-2-aryl-3-benzoyl-7,7-dimethyl-6,8-dioxo-spiro[3,5]nona-5,9-dione (3a-3e) and
Abstract: The reaction of electron-deficient cyclopropane derivatives, cis-1-methoxycarbonyl-2-aryl-6,6-dimethyl-5,7-dioxospiro[2,5]octa-4,8-diones with benzoylmethylenetriphenylarsorane (2) and methoxycarbonylmethylene-triphenylarsorane (4) was found to form cis,trans-1-methoxycarbonyl-2-aryl-3-benzoyl-7,7-dimethyl-6,8-dioxo-spiro[3,5]nona-5,9-dione (3a–3e) and trans, cis,trans-5-[2′-methoxycarbonyl-2′-(triphenylarsoranylidene)acetyl]-6-oxo-3-aryl-tetrahydro-pyran-2,4-dicarboxylic acid dimethyl esters (5a–5c) respectively with high stereoselectivity. The possible reaction mechanisms for the formation of the different products were also proposed.
33 citations
TL;DR: In this article, the performances of the density functional theory (DFT) methods in calculating XH bond dissociation energies (BDE, XC, N, O, Si, P, S) were evaluated.
Abstract: The performances of the density functional theory (DFT) methods in calculating XH bond dissociation energies (BDE, XC, N, O, Si, P, S) were evaluated. It was found that most DFT methods including B3LYP, B3PW91, G96LYP, PBE1PBE and BH&HLYP significantly underestimated the XH BDE by as much as 13–24 kJ/mol. The underestimation is not due to the use of finite basis set, because the DFT methods still significantly underestimate the XH BDE with the complete basis set. Therefore, these DFT methods can not be used to calculate the BDE directly. Nevertheless, the B3P86 method shows very small underestimation for the XH BDE. Further analysis suggests that there be no advantage for using the restricted open-shell DFT methods. The unrestricted DFT methods actually perform slightly better than the restricted open-shell DFT methods in most cases. Finally, it was found that the underestimation by the DFT methods was largely systematic. The use of the calibrated UDFT/6-311++G(d, p) method was recommended to calculate the XH BDE.
33 citations
TL;DR: In this article, a direct asymmetric aldol addition of methyl ketones to 2,2,2-trifluoro-1-phenylethanone and its ring-substituted derivatives was achieved using L-proline as a chiral promoter.
Abstract: Direct asymmetric aldol addition of methyl ketones to 2,2,2-trifluoro-1-phenylethanone and its ring-substituted derivatives was achieved using L-proline as a chiral promoter. Various optically active β-trifluoromethyl-β-hydroxy ketones were obtained in almost quantitative yields with moderate enantioselectivities up to 64 % ee.
32 citations
TL;DR: A novel electrochemical method as a sensitive and convenient technique for the determination of heme proteins based on their interaction with ZnO nanorods was developed in this article, where the results showed that both hemoglobin and cytochrome c could be oxidized on the modified electrode and the oxidation currents were linear to the concentrations of the analytes in aqueous solutions.
Abstract: A novel electrochemical method as a sensitive and convenient technique for the determination of heme proteins based on their interaction with ZnO nanorods was developed A ZnO nanorod modified glassy carbon electrode (ZnO/GCE) was prepared and the electrochemical behaviors of heme proteins, such as hemoglobin (HB) and cytochrome c (Cyt-c), on this modified electrode have been studied The results showed that both HB and Cyt-c could be oxidized on the modified electrode and the oxidation currents were linear to the concentrations of the analytes in aqueous solutions In addition, the results of flow injection analysis (FIA) further suggested the high stability and reproducibility of the ZnO nanorod modified electrode So this method can be applied to the determination of HB and Cyt-c in biological systems
30 citations
TL;DR: An α-cyclodextrin (α-CD) incorporated carbon nanotube (CNT)-coated electrode was fabricated and applied to the simultaneous determination of dopamine (DA) and epinephrine (EP).
Abstract: An α-cyclodextrin (α-CD) incorporated carbon nanotube (CNT)-coated electrode was fabricated and applied to the simultaneous determination of dopamine (DA) and epinephrine (EP). It has been found that the modified electrode shows strong catalytic effects on the electro-separation of DA and EP, and the cathodic potential difference between DA and EP is about 390 mV. The reducing peak current is proportional to DA and EP concentrations in the range of 2.0×10-6–1.0×10-3 and 1.0×10-6–1.0×10-3 mol·L-1, respectively. Their detection limits can reach 1×10-6 and 5×10-7 mol·L-1, respectively. Because the oxidation of ascorbic acid (AA) is an irreversible reaction in α-CD/CNT film, the interference of AA in determination of DA and EP is eliminated.
29 citations
TL;DR: The bioassay tests showed that these title compounds exhibit moderate anticancer activity in vitro by MTT method and compounds 6c and 6d could inhibit ERK phosphorylation in NIH 3T3 cell induced by PDGF.
Abstract: A series of 2,3,4-trimethoxyacetophenoxime esters containing benzothiazole moiety were synthesized by the reaction of oxime with acyl chloride in alkaline medium. Their structures were established by elemental analysis, IR, and 1H NMR spectra. The bioassay tests showed that these title compounds exhibit moderate anticancer activity in vitro by MTT method and compounds 6c and 6d could inhibit ERK phosphorylation in NIH 3T3 cell induced by PDGF.
TL;DR: In this article, a matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using carbon nanotubes as matrix has been applied to the analysis of amino acid mixture successfully.
Abstract: Twenty common amino acids have been analyzed successfully by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using carbon nanotubes as matrix. From the spectra, little or no background interference or fragmentation of the analytes has been observed. This method was also applied to the analysis of amino acid mixture successfully. Carbon nanotubes have some features such as large surface area to disperse the analyte molecules sufficiently and prevent the sample aggregation and strong ultraviolet absorption to transfer energy easily to the analyte molecules. The present method has potential application for the rapid and sensitive analysis of amino acids and their mixture
TL;DR: In this article, the synthesis of formic acid from carbon dioxide and hydrogen using a silica immobilized ruthenium catalyst as precursor has been studied in different reaction conditions, and the results revealed that the TOF (turn over frequency) of HCOOH achieved 1481.5 h-1 on the catalyst near the critical pressure point of CO2 with H2 pressure of 4.0 MPa.
Abstract: The synthesis of formic acid from carbon dioxide and hydrogen using a silica immobilized ruthenium catalyst as precursor has been studied in different reaction conditions. The results revealed that the TOF (turn over frequency) of HCOOH achieved 1481.5 h-1 on immobilized ruthenium catalyst near the critical pressure point of CO2 with H2 pressure of 4.0 MPa, reaction temperature of 80 °C and PPh3/Ru molar ratio of 6:1. The reaction activity of immobilized catalyst was higher than that of homogeneous catalyst, and the immobilized catalyst also offered the practical advantages such as easy separation and reuse.
TL;DR: In this paper, the authors presented novel synthesis of NaA zeolite membrane with good performance using microwave heating, which involved two steps, prior seeding 120 nm of LTA crystals on substrate and then employing a secondary hydrothermal synthesis.
Abstract: The paper presented novel synthesis of NaA zeolite membrane with good performance using microwave heating. The method involved two steps, prior seeding 120 nm of LTA crystals on substrate and then employing a secondary hydrothermal synthesis. Effects of seeding times, synthesis time and synthesis times were investigated in this work. The quality evaluation of membranes respectively used single component gases (HE and N2) and H2/N2 (equivalent volume) mixture. The ideal H2,/N2 selectivity increased from 1.90 of the substrate to 6.37 of the three-stage synthesized membrane, which was distinctly higher than the corresponding Knudsen diffusion selectivity of 3.74. However, the real H2/N2 selectivity of the three-stage synthesis was much lower than the corresponding ideal selectivity and close to the corresponding Knudsen diffusion selectivity of 3.74.
TL;DR: Samarium diiodide (SmI2) was found to be an efficient catalyst for the condensation of o-phenylenediamine and ketones to afford the corresponding 2,3-dihydro-1H-benzo[b][1,4]-diazepines in moderate to excellent yields under very mild and solvent-free conditions.
Abstract: Samarium diiodide (SmI2) was found to be an efficient catalyst for the condensation of o-phenylenediamine and ketones to afford the corresponding 2,3-dihydro-1H-benzo[b][1,4]-diazepines in moderate to excellent yields under very mild and solvent-free conditions. The real active species here was suggested to be a Sm(III) intermediate formed in situ and the mechanism of the present reaction was proposed.
TL;DR: In this paper, an efficient and green procedure for the urea catalyzed Knoevenagel condensation was developed, in which a catalytic ammount of urea, stoichiometric aldehyde and active methylene compound reacted under solvent-free conditions at 100 °C for 5-60 min to give nearly quantitative yield of product.
Abstract: An efficient and green procedure for the urea catalyzed Knoevenagel condensation was developed. In the presence of a catalytic ammount of urea, stoichiometric aldehyde and active methylene compound reacted under solvent-free conditions at 100 °C for 5-60 min to give nearly quantitative yield of product.
TL;DR: In this article, cobalt hexacyanoferrate (CoHCF) nanoparticles were synthesized by simply mixing appropriate reactants in the absence of surfactant or template.
Abstract: Cobalt hexacyanoferrate (CoHCF) nanoparticles, with an average size of less than 50 nm for individual crystallite, were synthesized by simply mixing appropriate reactants in the absence of surfactant or template. Elemental analysis provided a stoichiometric formula, K0.2Co1.4[Fe(CN)6]·xH2O for this compound. The involvement of both ferromagnetic Co1.5II[FeIII(CN)6] and antiferromagnetic KCoIII[FeII(CN)6] species in the CoHCF complex was effectively proved by Fourier transform infrared spectroscopy, so was the existence of certain amounts of interstitial water molecules. A glassy carbon electrode modified with these CoHCF nanoparticles had high stable and reversible cyclic voltammetric responses even at high scan rates and its electrochemical properties were affected by the nature of counter cations and the concentration of supporting electrolyte. The prepared nanoparticle films, as a mediator on electrode surface, exhibited considerable electrocatalytic activity toward the oxidation of dopamine.
TL;DR: In this article, N-hydroxylacridinedione derivatives were synthesized by three-component reaction of aromatic aldehydes, 1,3-dicarbonyl compounds and hydroxylamine hydrochloride using triethylbenzylammonium chloride (TEBA) as the catalysis in water.
Abstract: N-Hydroxylacridinedione derivatives were synthesized by three-component reaction of aromatic aldehydes, 1,3-dicarbonyl compounds and hydroxylamine hydrochloride using triethylbenzylammonium chloride (TEBA) as the catalysis in water. The reaction has many advantages including good yields, easy to be separated and environmental friendliness.
TL;DR: In this paper, the binding of flucytosine to bovine serum albumin (BSA) was studied by means of fluorescence and absorption spectra under the conditions of simulant clay physiology.
Abstract: The binding of flucytosine to bovine serum albumin (BSA) was studied by means of fluorescence and absorption spectra under the conditions of simulant clay physiology. It showed a powerful ability to quench the fluorescence launching from BSA. After analyzing the fluorescence quenching data by Stern-Volmer equation and Lineweaver-Burk double-reciprocal equation, it was found that they matched the latter better and so they belonged to static quenching. The binding constant was calculated to be 5.710×103 L·mol-1 at 297 K. The binding locality was a distance 2.49 nm away from tryptophan residue-212 based on Forster's non-radiation energy transfer mechanism. The binding power is mainly the hydrogen bond and van der Waals force according to the thermodynamic parameters. The information of BSA conformation was acquired by synchronous fluorescence spectrum and three-dimensional fluorescence spectrum.
TL;DR: The interaction between naproxen and yeast DNA was studied and was found to be a groove binding mode by UV spectra, the influence of ion strength and I− quenching effect, independent on DNA concentration.
Abstract: The interaction between naproxen and yeast DNA was studied using fluorescence spectrometry and ultra-violet (UV) spectrometry. The addition of yeast dsDNA to naproxen solution resulted in a strong fluorescence quenching. Both the Stern-Volmer and the Scatchard plots of the fluorescence quenching showed a curve with two slopes and a threshold DNA concentration of about 100 µmol·L−1. The interaction between naproxen and the dsDNA was found to be a groove binding mode by UV spectra, the influence of ion strength and I− quenching effect. This mode was independent on DNA concentration. However, the increase in DNA concentration changed the binding constant K of naproxen to yeast dsDNA and the number of binding sites in DNA base pairs (n).
TL;DR: Groups 5 and 6 metal chlorides such as MoCl5, WCl6, NbCl5 and TaCl5 were found to be simple and very efficient catalysts for the aromatic H/D exchange reactions as discussed by the authors.
Abstract: Groups 5 and 6 metal chlorides such as MoCl5, WCl6, NbCl5 and TaCl5 were found to be simple and very efficient catalysts for the aromatic H/D exchange reactions. Compared with other metal chlorides such as ZnCl2, SnCl4 and TiCl4, groups 5 and 6 metal chlorides showed better catalytic activity in the H/D exchange reaction of naphthalene with C6D6. Deuteration of anthracene using MoCl5 as a catalyst proceeded within 24 h at room temperature. Other aromatic compounds such as toluene, diphenylmethane and 1,1,2-triphenylethane were also deuterated smoothly in C6D6 within 24 h at room temperature.
TL;DR: In this paper, a one-pot synthesis of a series of 5-oxo-5,6,7,8-tetrahydro-4H-benzo-[b]-pyran derivatives via three-component coupling reactions of aldehydes, dimedone and malononitrile in room temperature ionic liquids (RTILs) without any catalyst has been reported.
Abstract: A one-pot synthesis of a series of 5-oxo-5,6,7,8-tetrahydro-4H-benzo-[b]-pyran derivatives via three-component coupling reactions of aldehydes, dimedone and malononitrile in room temperature ionic liquids (RTILs) without any catalyst has been reported. In the meantime, the reuse of ionic liquids and the effect of different ionic liquids as solvent on the reaction have also been investigated.
TL;DR: In this article, the experimental data of benzene, benzyl alcohol (BA), benzonitrile (BN), benzoyl chloride (BC), chlorobenzene (CB), and their thirty six binary mixtures, with benzene as common component, were measured at 303.15 K over the entire mole fraction range.
Abstract: Densities, ρ, ultrasonic speeds, u, viscosities, η , and refractive indices, n, of pure benzene, benzyl alcohol (BA), benzonitrile (BN), benzoyl chloride (BC), chlorobenzene (CB) and their thirty six binary mixtures, with benzene as common component, were measured at 303.15 K over the entire mole fraction range. From these experimental data the values of deviations in ultrasonic speed, Δu, isentropic compressibility, Δks, excess acoustic impedance, ZE, deviation in viscosity, Δη, and excess Gibbs free energy of activation of viscous flow, G*E, and partial molar isentropic compressibility, of BA, BN, BC and CB in benzene were computed. The variation of these derived functions with composition of the mixtures suggested the increased cohesion (molecular order) in the solution and that interaction (A-B)>(A-A) or (B-B). Moreover, theoretical prediction of ultrasonic speed, viscosity and refractive index of all the four binary mixtures was made on the basis of empirical and semi-empirical relations by using the experimental values of the pure components. Comparison of theoretical results with the experimental values was made in order to assess the suitability of these relations in reproducing the experimental values of u, η and n. Also, molecular radii of pure liquids and the average molecular radii of binary mixtures were evaluated using the corresponding refractive indices of pure liquids and binary mixtures. The average molecular radii of binary mixtures were found to be additive with respect to mole fraction of the pure component.
TL;DR: In this paper, a conducting polymer, poly(thionine), modified electrode as matrix to DNA immobilization as well as transducer to label-free DNA hybridization detection was introduced.
Abstract: In this work, the application of a conducting polymer, poly(thionine), modified electrode as matrix to DNA immobilization as well as transducer to label-free DNA hybridization detection was introduced. The electropolymerization of thionine onto electrode surface was carried out by a simple two-step method, which involved a preanodization of glassy carbon electrode at a constant positive potential in thionine solution following cyclic voltammetry scans in the solution. Electrochemical detection was performed by differential pulse voltammetry in the electroactivity potential domain of poly(thionine). The resulting poly(thionine) modified electrode showed a good stability and electroactivity in aqueous media during a near neutral pH range. Additionally, the pendant amino groups on the poly(thionine) chains enabled poly(thionine) modified electrode to immobilize phosphate group terminated DNA probe via covalent linkage. Hybridization process induced a clear decrease in poly(thionine) redox current, which was corresponding to the decrease in poly(thionine) electroactivity after double stranded DNA was formed on the polymer film. The detection limit of this electrochemical DNA hybridization sensor was 1.0×10−10 mol/L. Compared with complementary sequence, the hybridization signal values of 1-base mismatched and 3-base mismatched samples were 63.9% and 9.2%, respectively.
TL;DR: In this article, seven new sesquiterpenoids, namely eupatochinilides I-VII (1, 7), together with eight known compounds, euponin (8), mollisorin A (9), niveusin B (10), 8β-(4′,acetoxy-tiglyloxy)-3β -hydroxy-6Hβ,7Hα-germacra-1(10)E,4E,11(13)-trien-6,12-olide (11), e
Abstract: Seven new sesquiterpenoids, namely eupatochinilides I–VII (1–7), together with eight known compounds, euponin (8), mollisorin A (9), niveusin B (10), 8β-(4′,-acetoxy-tiglyloxy)-3β -hydroxy-6Hβ,7Hα-germacra-1(10)E,4E,11(13)-trien-6,12-olide (11), eupalinilide B (12), 8β-(4′-hydroxytigloyloxy)-5-desoxy-8-desacyleuparotin (13), 3-deacetyeupalinin A (14), and 15-hydroxyleptocarpin (15), were isolated from the ethanolic extract of the whole plant of Eupatorium chinense L. Their structures and stereochemistry were established by spectroscopic methods and GIAO based 13C NMR chemical shift calculations.
TL;DR: In this article, the effect of LaCl3 on the K3Fe(CN)6 reduction rate and the oxygen-evolving rate of PSII particles of spinach, and the spectral characterization of the D1/D2/Cytb559 complex consisting of three polypeptides from spinach were studied.
Abstract: The effect of LaCl3 on the K3Fe(CN)6 (FeCy) reduction rate and the oxygen-evolving rate of PSII particles of spinach, and the spectral characterization of the D1/D2/Cytb559 of a PSII reaction center complex consisting of three polypeptides from spinach were studied. The experimental results showed that LaCl3 could significantly accelerate the transformation from light energy to electric energy, the electron transport, water photolysis and oxygen evolution of PSII of spinach, which was related to the spectral characterization of the D1/D2/Cytb559 complex. Soret band and Q band of Chl-a of UV-vis spectrum of D1/D2/Cytb559 complex were blue shifted, and the fluorescence emission peak was blue shifted in LaCl3 treated spinach compared with that in the control. The EXAFS (extended X-ray absorption fine structure spectroscopy) revealed that La3+ was coordinated with 8 nitrogen or oxygen atoms in the first coordination shell with LaN or LaO bond length of 0.254 nm, and with 6 nitrogen or oxygen atoms in the second coordination shell with LaN or LaO bond length of 0.321 nm in the D1/D2/Cytb559 complex. The CD suggested that the secondary structure of D1/D2/Cytb559 complex have been little affected by the treatment of LaCl3.
TL;DR: In this paper, the cobalt(II) nitrate reaction with 1,10-phenanthroline (phen) and 5-sulfosalicylic acid (H3ssal) led to a novel complex.
Abstract: Cobalt(II) nitrate reacted with 1,10-phenanthroline (phen) and 5-sulfosalicylic acid (H3ssal) to yield the cobalt(II) complex [Co(phen)2(H2O)2](Hssal)·4H2O (1) and the reaction of 1 with copper acetate led to a novel complex [Co(phen)(H2O)4][Cu2(ssal)2(phen)2]·5H2O (2). These two complexes were cation-anion species and the cationic motif [Co(phen)2(H2O)2]2+of 1 could be converted to [Co(phen)(H2O)4]2+ in the formation process of new anion [Cu2(phen)2(ssal)2]2− of 2. In both complexes abundant hydrogen bonds construct different supramolecular architectures, thus the conversion reaction can provide a new path to create novel supramolecular network.
TL;DR: In this article, an immersing technique using porous alumina membranes as the template was used for the formation of organic nanotubes from two kinds of chiral molecules, R-di-2-naphthylprolinol (DNP) with an asymmetric carbon atom and R-(+)-1,1'-bi-2 naphthol dimethyl ether (BNDE) with the conformational asymmetry.
Abstract: Organic nanotubes from two kinds of chiral molecules, R-di-2-naphthylprolinol (DNP) with an asymmetric carbon atom and R-(+)-1,1'-bi-2-naphthol dimethyl ether (BNDE) with the conformational asymmetry, were prepared by the immersing technique using porous alumina membranes as the template. It was found that the nanotubes from DNP with an asymmetric carbon atom presented the same chirality as the solution with slight red shift of the CD signals upon the formation of the nanotubes, while no well-defined chirality could be identified for the nanotubes from BNDE with the conformational asymmetry.
TL;DR: In this article, Ni/SiO2 catalysts promoted by alkali metals K and Cs or alkaline earth metals Mg, Ca, Sr and Ba were prepared, characterized by H2-TPR and XRD, and used for the synthesis gas via methane reforming with CO2.
Abstract: Ni/SiO2 catalysts promoted by alkali metals K and Cs or alkaline earth metals Mg, Ca, Sr and Ba were prepared, characterized by H2-TPR and XRD, and used for the production of synthesis gas via methane reforming with CO2. Though K and Cs promoted Ni catalysts could eliminate coke deposition, the reforming activity of these promoted catalysts was decreased heavily. Mg and Ca promoted Ni/SiO2 catalysts exhibited excellent coke resistance ability with minor loss of the reforming activity of Ni/SiO2. Ba showed poor coke resistance ability and small amount of Sr increased the formation of coke. The possible mechanism of these promoters was discussed.
TL;DR: It is reported, for the first time, that Archaerhodopsin-4 (AR4) could be reconstituted into phospholipid liposomes by self-assembly by maintaining its biological activity in proteoliposome, but also keeps a preferred orientation in self- assembly.
Abstract: This paper reports, for the first time, that Archaerhodopsin-4 (AR4) could be reconstituted into phospholipid liposomes by self-assembly. AR4 is a new membrane protein isolated from halobacteria H.sp. xz515 in a salt lake of Tibet, China. This is a bacteriorhodopsin (bR) like protein, function as a light-driven proton pump. Experimental measurements verified that similar to bR, AR not only remains its biological activity in proteoliposome, but also keeps a preferred orientation in self-assembly.