Showing papers in "Journal of The Chemical Society, Chemical Communications in 1994"
TL;DR: Using two-phase reduction of AuCl4 by sodium borohydride in the presence of an alkanethiol, solutions of 1-3 nm gold particles bearing a surface coating of thiol have been prepared and characterised; this novel material can be handled as a simple chemical compound as mentioned in this paper.
Abstract: Using two-phase (water–toluene) reduction of AuCl4– by sodium borohydride in the presence of an alkanethiol, solutions of 1–3 nm gold particles bearing a surface coating of thiol have been prepared and characterised; this novel material can be handled as a simple chemical compound.
6,251 citations
TL;DR: An ultralarge pore titanium silicate with MCM-41 structure has been prepared by direct hydrothermal synthesis; this material gives rise to useful catalysts for the selective oxidation of small and large organic compounds.
Abstract: An ultralarge pore titanium silicate with MCM-41 structure has been prepared by direct hydrothermal synthesis; this material gives rise to useful catalysts for the selective oxidation of small and large organic compounds.
629 citations
TL;DR: The crystal structure of 1-ethyl-3methylimidazolium (EMI+) hexafluorophosphate consists of interionic interactions dominated by cation-anion coulombic forces with minimal hydrogen bonding as discussed by the authors.
Abstract: The crystal structure of 1-ethyl-3-methylimidazolium (EMI+) hexafluorophosphate consists of interionic interactions dominated by cation–anion coulombic forces with minimal hydrogen bonding and serves as a model for EMI+ room temperature molten salts containing weakly complexing anions.
333 citations
TL;DR: In this article, 1-Hydroxy-7-azabenzotriazole (HOAt) and its corresponding uronium and phosphonium salts are shown to be superior to their benzotrizole analogs in solid-phase peptide synthesis.
Abstract: 1-Hydroxy-7-azabenzotriazole (HOAt) and its corresponding uronium and phosphonium salts are shown to be superior to their benzotriazole analogs in solid-phase peptide synthesis, thereby making possible the automated synthesis of peptides containing hindered amino acids.
297 citations
TL;DR: In this paper, the synthesis and single crystal X-ray structures of two interwoven cationic frameworks that are based upon tetrahedral and trigonal CuI ions were reported.
Abstract: The synthesis and single crystal X-ray structures are reported of two interwoven cationic frameworks that are based upon tetrahedral and trigonal CuI ions; the resulting architectures are diamondoid, [CuI(bipy)2(PF6)]∞(bipy = 4,4′-bipyridyl)1, and honeycomb, [CuI)2(pz)3(SiF6)]∞(pz = pyrazine)2, respectively.
294 citations
TL;DR: C60 and C70 can be solubilized into water with poly(vinylpyrrolidone)(PVP) and the aqueous solutions of C 60 and C 70 are applied to haemolysis test.
Abstract: C60 and C70 can be solubilized into water with poly(vinylpyrrolidone)(PVP) and the aqueous solutions of C60 and C70 are applied to haemolysis test.
236 citations
TL;DR: Substitution of vanadium into the framework of mesoporous MCM-41 molecular sieves has been achieved; these materials were found to be very efficient catalysts for the selective oxidation of large organic molecules using hydrogen peroxide as mentioned in this paper.
Abstract: Substitution of vanadium into the framework of mesoporous MCM-41 molecular sieves has been achieved; these materials were found to be very efficient catalysts for the selective oxidation of large organic molecules using hydrogen peroxide.
234 citations
TL;DR: The title porphyrin shows non ideal cmc with formation of J-aggregates, due to the formation of intermolecularly stabilized zwitterions, which at high concentration also results in Haggregate as discussed by the authors.
Abstract: The title porphyrin shows non ideal cmc with formation of J-aggregates, due to the formation of intermolecularly stabilized zwitterions, which at high concentration also results in H-aggregates.
233 citations
TL;DR: Boronic acid derivative 1 displays a remarkable fluorescence enhancement over a large pH range in aqueous media upon the saccharide binding as mentioned in this paper, which can be seen as an indicator of the presence of acid molecules.
Abstract: Boronic acid derivative 1 displays a remarkable fluorescence enhancement over a large pH range in aqueous media upon the saccharide binding.
212 citations
TL;DR: In this article, the complexation of cis or trans meso-dipyridyl porphyrins by trans substituted metal ions (PdII, PtII) of square planar coordination geometry leads to the self-assembly of multiporphyrin arrays of square architecture.
Abstract: The complexation of cis or trans meso-dipyridyl porphyrins by cis or trans substituted metal ions (PdII, PtII) of square planar coordination geometry leads to the self-assembly of multiporphyrin arrays of square architecture.
206 citations
TL;DR: In this article, three novel coordination polymers, [Ag(N)-N)2]X (N−N = 4,4′-bipyridyl, X = CF3SO3−1; N−N= 4-cyanopyridine, X= BF4−1, in two polymorphs, 2 and 3, are prepared and investigated by single crystal X-ray analysis; 1 and 2 contain three-dimensional cationic frameworks, both consisting of four equivalent interpenetrating diamondoid lattices.
Abstract: Three novel coordination polymers, [Ag(N–N)2]X (N–N = 4,4′-bipyridyl, X = CF3SO3––1; N–N = 4-cyanopyridine, X = BF4–, in two polymorphs, 2 and 3)], are prepared and investigated by single crystal X-ray analysis; 1 and 2 contain three-dimensional cationic frameworks, both consisting of four equivalent interpenetrating diamondoid lattices, while 3 is formed by two-dimensional layers of distorted squares.
TL;DR: Water-soluble malonic acid derivatives of C60 have been synthesised by hydrogenolysis of stereochemically defined mono-, bis-and tris-adducts of C 60 and di(ethoxycarbonyl)methylene.
Abstract: Water-soluble malonic acid derivatives of C60 have been synthesised by hydrogenolysis of stereochemically defined mono-, bis- and tris-adducts of C60 and di(ethoxycarbonyl)methylene.
TL;DR: In this article, a magneto-structural relationship showing linear dependence of antiferromagnetic exchange coupling constant on Ni-O-Ni bridge angle as well as the intramolecular Ni ⋯ Ni distance has been obtained with a series of phenoxy-bridged macrocyclic dinickel(II) complexes with centrosymmetric structures.
Abstract: A magneto-structural relationship showing linear dependence of antiferromagnetic exchange coupling constant (–J) on Ni–O–Ni bridge angle as well as the intramolecular Ni ⋯ Ni distance has been obtained with a series of phenoxy-bridged macrocyclic dinickel(II) complexes with centrosymmetric structures.
TL;DR: The phases AFeIIFeIII(C2O4)3(A = NPrn4; NBun4; PPh4) have been synthesised and characterised chemically, structurally and magnetically; they behave as ferrimagnets, but the tetrabutylammonium salt shows a highly unusual negative magnetisation at low temperature.
Abstract: The phases AFeIIFeIII(C2O4)3(A = NPrn4; NBun4; PPh4) have been synthesised and characterised chemically, structurally and magnetically; they behave as ferrimagnets, but the tetrabutylammonium salt shows a highly unusual negative magnetisation at low temperature.
TL;DR: A mixture of hexafluoroisopropanol-dichloromethane (1:4 v/v) was used in this paper for peptide fragment cleaving.
Abstract: A mixture of hexafluoroisopropanol–dichloromethane (1:4 v/v) acts as a fast, effective and convenient reagent for cleaving protected peptide fragments with a minimal amount of racemization from 2-chlorotrityl chloride resin.
TL;DR: In this paper, the synthesis and X-ray crystal structure of a linear unsymmetrical trinuclear cobalt(II) complex with a syn-syn bis(2-pyridyl)amido ligand, possessing a short, localized CoII-CoII bond and a spin crossover square-pyramidal CoII ion, is described.
Abstract: The synthesis and X-ray crystal structure of a linear unsymmetrical trinuclear cobalt(II) complex with a syn–syn bis(2-pyridyl)amido ligand, possessing a short, localized CoII–CoII bond and a spin crossover square-pyramidal CoII ion, is described.
TL;DR: Dictyostatin 1 2, a new type of macrocyclic lactone bearing a 22-membered ring system, has been isolated from a Republic of Maldives marine sponge and found to strongly inhibit growth of the murine P388 lymphocytic leukaemia.
Abstract: Dictyostatin 1 2, a new type of macrocyclic lactone bearing a 22-membered ring system, has been isolated (3.4 × 10–7% yield) from a Republic of Maldives marine sponge in the genus Spongia and found to strongly inhibit growth of the murine P388 lymphocytic leukaemia.
TL;DR: The first series of organometallic silicon dendritic macromolecules, containing a controlled number of redox-active centres, were synthesized and characterized in this paper, where they were used for the first time.
Abstract: The first series of organometallic silicon dendritic macromolecules, containing a controlled number of redox-active centres, are synthesized and characterized.
TL;DR: In this paper, the use of surfactants as templates allows the synthesis of mesostructured transition-metal oxides by a cooperative, interface controlled condensation process, and the synthesis process is shown to work well in many applications.
Abstract: The use of surfactants as templates allows the synthesis of mesostructured transition-metal oxides by a cooperative, interface controlled condensation process.
TL;DR: In this article, the fluorescence of molecules 1−3 was enhanced by factors of up to 67 in the presence of magnesium and calcium ions in neutral water, which allows the selective monitoring of magnesium ions under simulated physiological conditions and permits the construction of truth tables with OR logic when these molecules are viewed as ion input-photon output molecular devices.
Abstract: The fluorescence of molecules 1–3 is enhanced by factors of up to 67 in the presence of magnesium and calcium ions in neutral water which allows the selective monitoring of magnesium ions under simulated physiological conditions and permits the construction of truth tables with OR logic when these molecules are viewed as ion input–photon output molecular devices.
TL;DR: In this article, a mesoporous MCM-41 family was synthesized with a Si : Al ratio as low as 8.5 : 1, without observing octahedral aluminium.
Abstract: A Crystalline mesoporous member of the MCM-41 family has been synthesised with a Si : Al ratio as low as 8.5 : 1, without observing octahedral aluminium.
TL;DR: The self-assembly of the complementary components AP2 and AU2, through hydrogen bonding via uracil and 2,6-diacylaminopyridine groups, yields polymeric supramolecular rigid rods (AP2, AU2)n that present a lyotropic mesophase.
Abstract: The self-assembly of the complementary components AP2 and AU2, through hydrogen bonding via uracil and 2,6-diacylaminopyridine groups, yields polymeric supramolecular rigid rods (AP2, AU2)n that present a lyotropic mesophase.
TL;DR: In this article, control of silicoaluminate activity during synthesis of MCM-41 leads to thicker pore walls, and hence to improved thermal and hydrothermal stabilities.
Abstract: Control of silicoaluminate activity during synthesis of MCM-41 leads to thicker pore walls, and hence to improved thermal and hydrothermal stabilities.
TL;DR: NMR investigations of the kinetics and thermodynamics of the competitive binding of L-methionine (Met), L-histidine (His), and 5′-monophosphates of guanosine (5′-GMP) to [Pt(dien)Cl]+(dien = 1,5-diamino-3-azapentane) in aqueous solution show that 5′'-GMP selectively displaces S-bound Met.
Abstract: NMR investigations of the kinetics and thermodynamics of the competitive binding of L-methionine (Met), L-histidine (His), and 5′-monophosphates of guanosine (5′-GMP), adenosine (5′-AMP), thymidine (5′-TMP) and cytidine (5′-CMP) to [Pt(dien)Cl]+(dien = 1,5-diamino-3-azapentane) in aqueous solution show that 5′-GMP selectively displaces S-bound Met, a finding which has implications for DNA platination by anticancer drugs in vivo.
TL;DR: Alkyl alkynoates are synthesized directly from alk-1-ynes, CO2, and bromoalkanes in the presence of a catalytic amount of copper(I) or silver (I) salt as discussed by the authors.
Abstract: Alkyl alkynoates are synthesized directly from alk-1-ynes, CO2, and bromoalkanes in the presence of a catalytic amount of copper(I) or silver(I) salt.
TL;DR: The first silylene complex of nickel was obtained from the stable silyene 1,3-di-tert and tetracarbonylnickel as discussed by the authors, which was characterized by single crystal X-ray diffraction and NMR spectroscopy.
Abstract: [Ni(LSi)2(CO)2]3; the first silylene complex of nickel, has been obtained from the stable silylene 1,3-di-tert-2,3-dihydro-1H-1,3,2-diazasilol-2-ylidene (LSi)1 and tetracarbonylnickel; complex 3 was characterized by single crystal X-ray diffraction and NMR spectroscopy (1H, 13C, 29Si).
TL;DR: In this article, a one-dimensional polymer, Cd2(µ-bpe)3]-NO3)4}n[1, bpe = 1,2-bis(4-pyridyl)ethane, is prepared; its structure is strikingly characterised by heptacoordinate CdII ions as well as by a unique main framework, i.e. two bpe units bridge two Cd II ions giving a cyclic closed structure which is linked to the next one by another bpe unit.
Abstract: A one-dimensional polymer {[Cd2(µ-bpe)3](NO3)4}n[1, bpe = 1,2-bis(4-pyridyl)ethane] is prepared; its structure is strikingly characterised by heptacoordinate CdII ions as well as by a unique main framework, i.e. two bpe units bridge two CdII ions giving a cyclic closed structure which is linked to the next one by another bpe unit.
TL;DR: In this paper, the Ni/La₂O₃ catalysts were used for carbon dioxide reforming of natural gas (methane) to synthesis gas and achieved near complete conversion of methane and carbon dioxide, and around 100% selectivity to carbon monoxide and hydrogen.
Abstract: This invention refers to a novel nickel-based catalyst which exhibits excellent activity and stability for carbon dioxide reforming of natural gas (methane) to synthesis gas. The catalyst consists of nickel crystallites in contact with La₂O₃ carrier or in the form of nickel supported on La₂O₃ carrier or in the form of nickel on La₂O₃ particles dispersed on a conventional carrier such as γ-Al₂O₃. The stable and active surface of Ni/La₂O₃ is formed, following two hours of the reaction of carbon dioxide reforming of methane at temperatures higher than 600°C. In contrast to conventional nickel-based catalysts, e.g. Ni/γ-Al₂O₃, the new Ni/La₂O₃ catalysts (at the stable state) are not prone to coking in the temperature range of 550-850°C, exhibiting excellent stability. Near complete conversion of methane and carbon dioxide, and around 100% selectivity to carbon monoxide and hydrogen are achieved over the Ni/La₂O₃ catalysts under stoichiometric conditions at temperatures in the neighbourhood of 8oo°C and a superficial contact time of ca. 0.02 seconds.
TL;DR: The new tripodal ligand tris-[3-(2′-pyridyl)pyrazol-1-yl]hydroborate, comprising three N,N-bidentate chelating arms linked by the apical boron atom, has been synthesized as mentioned in this paper.
Abstract: The new tripodal ligand tris-[3-(2′-pyridyl)pyrazol-1-yl]hydroborate (L–), comprising three N,N-bidentate chelating arms linked by the apical boron atom, has been synthesized; the crystal structure of [EuL(MeOH)2F][PF6] reveals the nine-coordinate metal lying within the hexadentate ligand cavity.
TL;DR: The OH group of the iminol complex [IrH2L′(PPh3)2]SbF6·2H2O where L′ is a tautomer of quinolin-8-acetamide, takes part in an O-H ⋯ H-Ir hydrogen bond.
Abstract: The OH group of the iminol complex [IrH2L′(PPh3)2]SbF6·2H2O where L′ is the iminol tautomer of quinolin-8-acetamide, takes part in an O–H ⋯ H–Ir hydrogen bond.