Showing papers on "Derivative (chemistry) published in 2018"
180 citations
TL;DR: In this article, a strawsheave-like Ce-BTC derivative with a special morphology and a large surface area was prepared by a simple method, which exhibited excellent catalytic activity, long-term stability and water resistance.
159 citations
TL;DR: The combination of diboron, pyridine and base serves as an efficient source of structurally well-defined super electron donors.
Abstract: Single-electron transfer is an important process in organic chemistry, in which a single-electron reductant (electron donor) acts as a key component Compared with metal-based electron donors, organic electron donors have some unique advantages, such as tunable reduction ability and mild reaction conditions The development of novel organic electron donors with good reduction ability together with ease of preparation is in high demand Based on the pyridine-catalyzed radical borylation reaction developed in our laboratory, we have discovered that, the reaction system consisting of a diboron(4) compound, methoxide and a pyridine derivative could smoothly produce super electron donors in situ Two boryl–pyridine based species, the major one being a trans-2H,2′H-[2,2′-bipyridine]-1,1′-diide borate complex and the minor one being a pyridine radical anion–borate complex, were observed and carefully characterized These complexes were found to be organic super electron donors unprecedented in literature, and their formation mechanisms were studied by DFT calculations The diboron/methoxide/pyridine system enables the preparation of organic super electron donors from easily accessible starting materials under mild conditions, which has the potential to be a general and practical single-electron reducing agent in organic synthesis
83 citations
TL;DR: PNT1 is employed as the electron acceptor in solution-processed bulk heterojunction organic solar cells, demonstrating the potential of this new type of materials for optoelectronic applications.
Abstract: The efficient synthesis of a new solution-processable n-type conjugated polymer network (PNT1) is reported through palladium-catalyzed Stille cross-coupling reaction conditions following the A3 + B2 synthetic approach. A benzo[1,2-b:3,4-b':5,6-b″]trithiophene derivative is used as the A3 knot and an alkyl functionalized naphthalenediimide is utilized as the B2 linker. The thermal, optical, and electrochemical properties are examined in detail, showing high thermal stability, absorbance in the visible part of the solar spectrum, and reversible reduction characteristics similar to those of the fullerene derivative [6,6]-phenyl-C71 -butyric acid methyl ester (PC71 BM). PNT1 is employed as the electron acceptor in solution-processed bulk heterojunction organic solar cells, demonstrating the potential of this new type of materials for optoelectronic applications.
77 citations
TL;DR: A catalytic asymmetric cyclization of novel 4-isothiocyanato pyrazolones and isatin-derived ketimines was developed, delivering a wide range of intriguing dispirotriheterocyclic products in high yield with excellent diastereoselectivities and enantioselectivity.
69 citations
62 citations
18 Jul 2018
TL;DR: Here, naphthalene diamine-based β-diketone derivative (compound LH) was successfully used as a dual signaling probe for divalent cations, Fe2+ and Cu2+ ions, in bimodal methods (colorimetric and fluorometric).
Abstract: Here, naphthalene diamine-based β-diketone derivative (compound LH) was successfully used as a dual signaling probe for divalent cations, Fe2+ and Cu2+ ions, in bimodal methods (colorimetric and fluorometric). It showed fluorescent enhancement for Fe2+ ion by photoinduced electron transfer mechanism and fluorescence quenching for Cu2+ ion by charge-transfer process. Binding stoichiometry for [LH–(Fe2+)2] and [LH–(Cu2+)2] was found to be 1:2 by Job’s plot method and, the binding constants were calculated as 1.6638 × 1010 and 9.22929 × 108 M–1, respectively. Compound LH exhibited OR and XOR logic gate behavior with H+, Fe2+, and Cu2+ as inputs. Further, the compound LH and bovine serum albumin binding interaction showed quenching of fluorescence by Forster resonance energy-transfer mechanism.
60 citations
60 citations
TL;DR: Sixteen new 2-(2-phenylethyl)chromone dimers, including four pairs of enantiomers, along with eight optically pure analogues, were isolated from the resinous wood of Aquilaria sinensis and exhibited significant inhibition of nitric oxide production in lipopolysaccharide-stimulated RAW264.
Abstract: Sixteen new 2-(2-phenylethyl)chromone dimers, including four pairs of enantiomers (1a/1b, 3a/3b, 6a/6b, and 8a/8b), along with eight optically pure analogues (2, 4, 5, 7, and 9–12) were isolated from the resinous wood of Aquilaria sinensis. Their structures were determined by extensive spectroscopic analysis (1D and 2D NMR, UV, IR, and HRMS) and experimental and computed ECD data. Compounds 1–10 feature an unusual 3,4-dihydro-2H-pyran ring linkage connecting two 2-(2-phenylethyl)chromone monomeric units, while compounds 11 and 12 possess an unprecedented 6,7-dihydro-5H-1,4-dioxepine moiety in their structures. A putative biosynthetic pathway of the representative structures via a diepoxy derivative of a chromone with a nonoxygenated A-ring is also proposed. Compounds 1a/1b, 2, 3a/3b, 5, 7, 8a/8b, and 10–12 exhibited significant inhibition of nitric oxide production in lipopolysaccharide-stimulated RAW264.7 cells with IC50 values in the range 7.0–12.0 μM.
58 citations
TL;DR: A new D-A type 1,2-pyridiazine derivative (3,4,5,6-tetrakis(4-methoxyphenyl) pyridazine (TPP) exhibiting turn-on fluorescence upon acid exposure both in solution and in the solid state is reported.
Abstract: Smart luminescent materials that are responsive to external stimuli have received considerable attention. Here, we report a new D-A type 1,2-pyridiazine derivative (3,4,5,6-tetrakis(4-methoxyphenyl)pyridazine (TPP)) exhibiting turn-on fluorescence upon acid exposure both in solution and in the solid state. The protonation of the 1,2-pyridiazine ring caused a variation in the emission colors of the acidification species from blue (406 nm) to orange-red (630 nm) with a huge Δλem (224 nm). As a result, a synthetic rainbow of emission in solution could be achieved from one single molecule, and white photoluminescence was readily tuned by controlled protonation. A trifluoroacetic acid (TFA)-sensor film made from TPP was demonstrated as a TFA-sensitive surface with high sensitivity and reversibility. On the basis of these findings, we constructed a solid-state TPP film with a photoacid generator and demonstrated data encryption and decryption via a cascade protonation reaction that was well controlled by UV light.
56 citations
TL;DR: In this article, a thiadiazol derivative, namely 3-((5-(3,5-dinitrophenyl)-1,3,4-thiadia-drug-2-yl)imino)indolin-1-one (TDIO), was investigated for it inhibitive impacts in 1'M HCl medium on corrosion of mild steel using weight loss and scanning electron microscope techniques.
Abstract: Iraq has been one of the most extensive oil and natural gas industries in the world. The corrosion of mild steel is costly and insufficiency process. It is responsible for great loss in manufacture and environment. Natural and organic inhibitors have been utilized for a long time to inhibit the corrosion. Selected thiadiazol derivative, namely 3-((5-(3,5-dinitrophenyl)-1,3,4-thiadiazol-2-yl)imino)indolin-2-one (TDIO) was investigated for it inhibitive impacts in 1 M HCl medium on corrosion of mild steel using weight loss and scanning electron microscope techniques. The maximum inhibition efficiency up to 90.7% at the maximum inhibitor concentration 0.5 mM. Surface morphology of results demonstrated that TDIO formed adsorbed film on surface of mild steel in hydrochloric acid solution. Give molecular based clarifications to the inhibitive impacts of the studied. The interactions between mild steel surface and the inhibitor molecules have been undertaken to further corroborate the methodological results.
TL;DR: It is demonstrated that the water-soluble naphthalimide-based derivative NC exhibits good cell permeability and could be employed to monitor free copper(II) ion and cysteine in the living cells.
Abstract: Cellular free copper ion is essential yet potentially toxic to living orgasms, thus cells have evolved mechanisms to balance global copper content including the chelation reactions by cysteine. To better understand the delicate counter-balance of free copper(II) ion and cysteine in the living cells, we developed a water-soluble naphthalimide-based derivative NC as a chemosensor for reversible dual detection of copper(II) ion and cysteine. The chemosensor NC exhibits a rapid, sensitive and quantitative response for copper(II) ion in aqueous solution due to the formation of the corresponding complex NC-Cu(II) in the range of 0–5 μM with the detection limit of 7.11 nM. Afterwards, NC is released from NC-Cu(II) complex accompanied with a “turn-on” fluorescence in the presence of cysteine ranging from 0 to 160 μM. It's also worth noting that the linear range of the NC-Cu(II) complex for the cysteine is identical with the intracellular level of cysteine under physiological conditions (30–200 μM). To achieve its practical application, we further demonstrated that the chemosensor NC exhibits good cell permeability and could be employed to monitor free copper(II) ion and cysteine in the living cells.
TL;DR: In this article, a new Schiff base derivative, 2-[(2-hydroxy-5-thiophen-2-yl-benzylidene)-amino]-6-methyl-benzoic acid (5), which has a thiophene ring and N, O donor groups, was successfully prepared by the condensation reaction of 2.
TL;DR: Molecular docking analysis was carried out to identify the potency of inhibition of the title molecule against human's Ubiquinol-Cytochrome C Reductase Binding Protein (UQCRB) and Methylenetetrahydrofolate reductase (MTHFR).
TL;DR: The in situ generated 1-Cu2+ complex can serve as an "on-off" fluorescent probe for high selectivity toward biothiols via Cu2+ displacement approach, which exerts ESIPT recovery.
TL;DR: A cyclic grafted polymer as discussed by the authors has a cyclic backbone and linear grafted side chains and their physical properties and conformations are controlled by steric hindrance from the grafted chains.
TL;DR: A novel fluorescent probe for the detection of H2S in living cells was designed and synthesized by introducing 2,4-dinitrophenyl ether into a phenanthroimidazole derivative and shows excellent sensitivity and high selectivity and competition.
Abstract: A novel fluorescent probe for the detection of H2S in living cells was designed and synthesized by introducing 2,4-dinitrophenyl ether into a phenanthroimidazole derivative The structures of the fluorophore and the probe were characterized using 1H NMR, 13C NMR and mass spectra The probe shows excellent sensitivity, and the detection limit is 111 μM High selectivity and competition are also revealed in corresponding studies The probe can be applied in a wide pH range Cellular assays indicate that the cytotoxicity of the probe is low, and the cellular permeability is good With these desirable properties, the probe demonstrates a possible approach for investigating the biological roles of H2S in living tissues
TL;DR: A TMM derivative is reported, in which the TMM segment is fused with three NiII meso-triarylporphyrins, that satisfies the above criteria and shows delocalized spin density on the propeller-like porphyrin π-network and the triplet ground state owing to the strong ferromagnetic interaction.
Abstract: Trimethylenemethane (TMM) diradical is the simplest non-Kekule non-disjoint molecule with the triplet ground state (ΔEST =+16.1 kcal mol-1 ) and is extremely reactive. It is a challenge to design and synthesize a stable TMM diradical with key properties, such as actual aliphatic TMM diradical centers and the triplet ground state with a large positive ΔEST value, since such species provide detailed information on the electronic structure of TMM diradical. Herein we report a TMM derivative, in which the TMM segment is fused with three NiII meso-triarylporphyrins, that satisfies the above criteria. The diradical shows delocalized spin density on the propeller-like porphyrin π-network and the triplet ground state owing to the strong ferromagnetic interaction. Despite the apparent TMM structure, the diradical can be handled under ambient conditions and can be stored for months in the solid state, thus allowing its X-ray diffraction structural analysis.
TL;DR: In this paper, the synthesis and evaluation of biological properties of 3a,8a-dihydroxy-8-oxo-1,3,3a, 8a-tetrahydroindeno[1,2-d ]imidazol-2(1 H )-iminium chloride were reported.
TL;DR: N,N-Di-R-N′-(4-chlorobenzoyl)thiourea (DiR: diethyl, di-n-propyl and diphenyl) ligands and their Pt(II) complexes (cis-[Pt(L1−4-S,O)2]) have been synthesized and structurally c...
Abstract: N,N-Di-R-N′-(4-chlorobenzoyl)thiourea (Di-R: diethyl, di-n-propyl, di-n-butyl and diphenyl) ligands (HL1–4) and their Pt(II) complexes (cis-[Pt(L1–4-S,O)2]) have been synthesized and structurally c...
TL;DR: In this article, a photo-crosslinked M-Cl membrane reaction through the acid chloride groups was used for Hg2+ detection in aqueous solution (M-MBZN).
Abstract: A Selective fluorescence solid sensor for Hg2+ detection in aqueous solution (M-MBZN) has been developed by grafting N-(2-hydroxyethyl)-4-(4-(1H-benzo[d]imidazol-2-yl)methyl) piperazine-1-yl)-1,8-naphthalimide (MBZN) to a photo-crosslinked M-Cl membrane reaction through the acid chloride groups. The resulting fluorescence sensor undergoes fluorescence enhancement upon binding mercuric ions which provokes a photo-induced electron transfer (PET) inhibition process from the piperazine to the naphthalimide moiety. Various photochemical parameters were determined by using pH-dependent absorption and fluorescence spectroscopies as well as the selective detection of Hg2+. The sensing membrane possesses a switchable “turn-on” fluorescence response to Hg2+ in pure water; it is easy to use and reusable and shows high selectivity and sensitivity.
TL;DR: The newly synthesized cyclohexane dioxime derivative showed its good uptake in tumor cells, which affords a potential radiopharmaceutical that could be used as a good tumor imaging agent.
Abstract: Purpose: Dioxime derivative is reported to exhibit high affinity towards tumor cells. The objective of the present study is to synthesize a new dioxime derivative to be labeled with technetium-99m ...
Patent•
31 May 2018
TL;DR: In this article, a pyrazolo-heteroaryl derivative, a preparation method and medical use of such a derivative were described, where each substituent in the general formula is defined in the description.
Abstract: Disclosed are a pyrazolo-heteroaryl derivative, a preparation method and medical use thereof In particular, the present invention relates to a new pyrazolo-heteroaryl derivative as shown in the general formula (I), a preparation method thereof and a pharmaceutical composition containing the derivative and the use thereof as a therapeutic agent, in particular as a TLR7 agonist, wherein each substituent in the general formula (I) is defined in the description
TL;DR: In this article, the self-assembly synthesis of Cu(II)-silsesquioxane involving 2,9-dimethyl-1,10-phenanthroline (neocuproine) as an additional N ligand at copper atoms was performed.
TL;DR: In this paper, a derivative operando (dOp) method was proposed to improve the resolution of operando NMR spectra by removing time independent signals and further distinguishing between time dependent signals associated with the formation and removal of species.
Abstract: Robust and reliable diagnostic tools that can be employed under operating conditions are crucial to understanding performance and failure mechanisms in battery processes. The operando spectrum of a battery often consists of a strongly overlapping mixture of time dependent and independent resonances due to the compositional complexity. Here we report a new method called derivative operando (dOp) that improves the resolution of operando nuclear magnetic resonance (NMR) spectra by removing time independent signals and further distinguishes between time dependent signals associated with the formation and removal of species. This approach not only provides better resolution but also more clearly reveals correlations between resonances and the chemical transformations occurring at a specific potential. With the dOp-NMR method we detect the formation of lithium graphite intercalation compounds (GICs), including the signatures of LiC72 and its precursors, which have been previously undetected. We also observe a clear correlation of the dOp 7Li NMR spectra of lithium metal dendrites on the counter electrode with the chemistry of the working electrode.
Journal Article•
TL;DR: In this paper, the inhibiting activity of three sets of organic compounds (2,3-dihydroxypropyl)sulfanyl]-N-octylacetamide (DSO), 2-[(2, 3ddihdioxypyl)-sulfanolamide(SSA)-N-decylacetamides (DSD) and 2, 3-dhydroxpropyl]-SSA-SSA (DSDD) were studied and sites for nucleophilic and electrophilic attacks for DSO were observed.
Abstract: The inhibiting activity of 3 sets of organic compounds ([2-[(2,3-dihydroxypropyl)sulfanyl]-N-octylacetamide (DSO), 2-[(2,3-dihydroxypropyl)sulfanyl]-N-decylacetamide (DSD) and 2-[(2,3-dihydroxypropyl)sulfanyl]-N-dodecylacetamide (DSDD)) were studied. The studied anti-corrosion compounds i.e. 2,3-dihydroxypropyl-sulfanyl derivatives were calculated using quantum chemical calculation and several descriptors (highest occupied molecular orbital energy (EHOMO), lowest unoccupied molecular orbital energy (ELUMO) and chemical reactivity indices (global electrophilicity index (ω), chemical hardness (η), electronegativity (χ), local reactivity index, electron affinity and ionization potential) which described the anti-corrosion properties of the studied compounds were obtained. Fukui Indices for nucleophilic and electrophilic Attacks for inhibitors i.e. [2-[(2,3dihydroxypropyl)sulfanyl]-N-octylacetamide (DSO), 2-[(2,3-dihydroxypropyl)sulfanyl]-Ndecylacetamide (DSD) and 2-[(2,3-dihydroxypropyl)sulfanyl]-N-dodecylacetamide (DSDD) were observed and sites for nucleophilic and electrophilic attacks for DSO were C6 (0.047) and O3 (0.170); for DSD, the utmost value for was found on C6 (0.047), and the highest value for was located on C5 with 0.099 while the greatest value for was situated on C6 with 0.047 and the highest value for is found on C3 and C4 with 0.053 each for the DSDD molecule. The molecules used in this study was calculated using quantum chemical calculation and it was achieved using Spartan 14. More so, the QSAR study using multiple linear regression method was executed using Gretl 1.9.8. The selected descriptors among the entire calculated descriptors were used in the development of quantitative structural activity relationship (QSAR) model and the developed model replicated the observed %IE. The correlation coefficient (R 2 ) was calculated to be 0.926, cross validation (CV.R 2 ) was 0.963 and adjusted R 2 was 0.852. Also, ELUMO was the predominating parameter in the corrosion inhibition property of the studied compounds. Received: August 23, 2018. Published: October 24, 2018 doi: 10.17675/2305-6894-2018-7-4-2 Int. J. Corros. Scale Inhib., 2018, 7, no. 4, 498–508 499
TL;DR: Pb2-mediated interlocked hexagonal self-assembly associated with the near-IR 'turn-on' detection of Pb2+ ions in water using a perylene diimide derivative (PDI-HQ).
TL;DR: The results of the Fourier-transform infrared measurement indicated that the triple helix structure of collagen was integrated after cross-linking, and the favorable biocompatibility of collagen hydrogels with 3,4-dihydroxybenzaldehyde demonstrated, indicate that the novel hydrogel had significant potential for applications.
Abstract: 3,4-Dihydroxybenzaldehyde, a derivative of catechol and an agent with an extensive pharmacological and biological activities, was used to modify collagen and prepared hydrogels. The aldehyde group ...
TL;DR: In this paper, the content of hybrid organic-inorganic lead halide perovskite has been investigated for future low-cost and high-efficiency solar technology, and serious concern about the content is expressed.
Abstract: Hybrid organic-inorganic lead halide perovskite has become one of the most attractive materials for future low-cost and high-efficiency solar technology. However, serious concern about the content ...