Showing papers in "Journal of The Chemical Society, Chemical Communications in 1990"
TL;DR: Gold surfaces intended for surface plasmon resonance sensors have been derivatized with a flexible matrix composed of carboxymethylated dextran to provide fast and efficient coupling of proteins and other ligands at low concentrations using the principles of ionic pre-concentration.
Abstract: Gold surfaces intended for surface plasmon resonance sensors have been derivatized with a flexible matrix composed of carboxymethylated dextran to provide fast and efficient coupling of proteins and other ligands at low concentrations using the principles of ionic pre-concentration; these hydrophilic and protein compatible hydrogel surfaces allow increased immobilization capacity as compared to monolayer based coatings, for applications in biospecific interaction analysis.
802 citations
TL;DR: In this paper, the mass and 13C NMR spectra of the species C60(Buckminster fullerene) and C70(fullerene-70) have been obtained, and the results indicate the existence of a family of stable fullerenes.
Abstract: Pure samples of the species C60(Buckminsterfullerene) and C70(fullerene-70) have been prepared, and their structures characterised by their mass and 13C NMR spectra; the results indicate the existence of a family of stable fullerenes, thus confirming that carbon possesses a third form in addition to diamond and graphite.
584 citations
TL;DR: In this paper, a convergent approach for the synthesis of dendritic macromolecules is presented and its scope and versatility demonstrated with the synthesis and characterization of a series of monodisperse DPMs based on 3,5dihydroxybenzyl alcohol as the monomer unit up to a molecular weight of 40 689.
Abstract: A novel convergent approach for the synthesis of dendritic macromolecules is presented and its scope and versatility demonstrated with the synthesis of a series of monodisperse dendritic polyether macromolecules based on 3,5-dihydroxybenzyl alcohol as the monomer unit up to a molecular weight of 40 689.
418 citations
TL;DR: Zn(H2O)2(4,4′-bipy)2]n2n+ sheets, which interpenetrate so that any particular sheet has an infinite number of perpendicular ones enmeshed or concatenated with it as mentioned in this paper.
Abstract: Zn(4,4′-bipy)2SiF6·2H2O (4,4′-bipy = 4,4′-bipyridine) consists of two perpendicular and equivalent stacks of infinite, essentially square grid [Zn(H2O)2(4,4′-bipy)2]n2n+ sheets, which interpenetrate so that any particular sheet has an infinite number of perpendicular ones enmeshed or concatenated with it.
343 citations
TL;DR: The zeolite ZSM-5 has been synthesized from amorphous aluminosilicate gels in a vapour of ethylenediamine, triethylamine, and water and characterized by XRD and chemical analysis as mentioned in this paper.
Abstract: The zeolite ZSM-5 has been synthesized from amorphous aluminosilicate gels in a vapour of ethylenediamine, triethylamine, and water and characterized by XRD and chemical analysis.
341 citations
TL;DR: The interaction of two suitably designed complementary ditopic molecular components generates spontaneously an organized supramolecular architecture displaying molecular sorting and orientation.
Abstract: The interaction of two suitably designed complementary ditopic molecular components (1,2) and (3,4) generates spontaneously an organized supramolecular architecture displaying molecular sorting and orientation.
218 citations
TL;DR: In this paper, the shape-selective oxidation of linear alkanes with H2O2 is catalysed by pentasil zeolite titanosilicate; the rates for linear alkane are much higher than those of branched and cyclic alkanes.
Abstract: Shape-selective oxidation of alkanes with H2O2 is catalysed by pentasil zeolite titanosilicate; the rates for oxidation of linear alkanes are much higher than those of branched and cyclic alkanes.
186 citations
TL;DR: In this paper, the peroxycarboxylic acids formed continuously in situ by lipase-catalysed perhydrolysis of the corresponding carboxyric acids were used for alkenes.
Abstract: Epoxidation of alkenes was achieved under extremely mild conditions by employing peroxycarboxylic acids formed continuously in situ by lipase-catalysed perhydrolysis of the corresponding carboxylic acids.
167 citations
TL;DR: In this paper, the authors derived rules describing hydrogen bond preferences of 2-aminopyrimidine from the crystal structure and stoicheiometries of cocrystals with mono- or di-carboxylic acids.
Abstract: Rules describing hydrogen bond preferences of 2-aminopyrimidine were derived from the crystal structure of 2-aminopyrimidine, stoicheiometries of cocrystals of 2-aminopyrimidine with mono- or di-carboxylic acids, and the crystal structure of the 1 : 1 2-aminopyrimidine/succinic acid cocrystal.
163 citations
TL;DR: In this article, single crystal X-ray diffraction studies indicate that E-D-CHCH-B(mes)2 and E-4-MeO-C6H4-E-4MeOÕC 6H4ÕBÔBÕÔ2 crystallises in the acentric space group P212121 and exhibits powder SHG of 1.064 µm laser light.
Abstract: Hydroboration of π-donor substituted alkynes D–CC–H [D = Ph2P, 4-X–C6H4-(X = H, MeS, MeO, H2N), and (η5-C5H5)Fe(η5-C5H4-)] with dimesitylborane {[(mes)2BH]2, mes = 2,4,6-Me3C6H2} yields air-stable ‘push–pull’E-alkenes of the form E-D–CHCH–B(mes)2, which possess large molecular hyperpolarizabilities, β, as shown by electric-field induced second-harmonic generation (EFISH) experiments at 1.91 µm; single crystal X-ray diffraction studies indicate that E-Ph–CHCH–B(mes)2 and E-4-MeO–C6H4–CHCH–B(mes)2 crystallise in centrosymmetric space groups, whereas E-Ph2P–CHCH–B(mes)2 crystallises in the acentric space group P212121 and exhibits powder SHG of 1.064 µm laser light.
162 citations
TL;DR: For example, β-and γ-cyclodextrin can form complexes with poly(propylene glycol) of various molecular weights to give crystalline compounds in high yields as discussed by the authors.
Abstract: β- and γ-cyclodextrin form complexes with poly(propylene glycol) of various molecular weights to give crystalline compounds in high yields, although they do not form complexes with propylene glycol, dipropylene glycol, nor tripropylene glycol; α-cyclodextrin does not form complexes with poly(propylene glycol)
TL;DR: In this article, the catalytic dimerization of propene to hexenes isomers by nickel complexes is described. But they do not specify the solvents used for this process.
Abstract: Organochloroaluminate molten salts based on aluminium trichloride or ethylaluminium dichloride and 1-methyl-3-butylimidazolium chloride, 1-butylpyridinium chloride or tetrabutylphosphonium chloride can be used as solvents for the catalytic dimerization of propene to hexenes isomers by nickel complexes.
TL;DR: N-Iodosuccinimide and trifluoromethanesulphonic acid provide a powerful source of Iodonium ion which allows ‘disarmed’ pent-4-enyl glycosides that normally respond sluggishly to lodonium dicollidine perchlorate to react rapidly and to exhibit stereodirection via neighbouring group participation of C-2 esters.
Abstract: N-Iodosuccinimide and trifluoromethanesulphonic acid provide a powerful source of Iodonium ion which allows ‘disarmed’ pent-4-enyl glycosides that normally respond sluggishly to lodonium dicollidine perchlorate, to react rapidly and to exhibit stereodirection via neighbouring group participation of C-2 esters.
Abstract: The synthesis and characterization of free-standing flexible films and powder forms of pernigraniline base, the fully oxidized form of polyaniline, by the oxidation of emeraldine base with m-chloroperbenzoic acid is reported.
TL;DR: The Mg|(LB monolayer)|Pt structures of Z-β-(1-hexadecyl-4-quinolinium)-α-cyano-4styryldicyanomethanide (C16H33-Q3CNQ) show asymmetric currentvoltage characteristics; the behaviour is attributed to the organic monolayers although whether it is due to the presence of the permanent dipole moment or molecular rectification is unclear.
Abstract: The Mg|(LB monolayer)|Pt structures of Z-β-(1-hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide (C16H33–Q3CNQ) show asymmetric current–voltage characteristics; the behaviour is attributed to the organic monolayer although whether it is due to the presence of the permanent dipole moment or molecular rectification is unclear.
TL;DR: Optically active 1-(3-pyridyl)alkanols, chiral self-catalysts, produced themselves of the same configuration in the enantioselective addition of dialkylzinc reagents to pyridine-3-carbaldehyde.
Abstract: Optically active 1-(3-pyridyl)alkanols, chiral self-catalysts, produced themselves of the same configuration in the enantioselective addition of dialkylzinc reagents to pyridine-3-carbaldehyde.
TL;DR: Partial asymmetric synthesis has been observed in intramolecular C-H insertion, aromatic cycloaddition, and cyclopropanation reactions of α-diazoketones catalysed by homochiral rhodium(II) mandelate carboxylates derived from L-proline as mentioned in this paper.
Abstract: Partial asymmetric synthesis has been observed in intramolecular C–H insertion, aromatic cycloaddition, and cyclopropanation reactions of α-diazoketones catalysed by homochiral rhodium(II) mandelate and rhodium(II) carboxylates derived from L-proline.
TL;DR: The synthesis is reported of a binuclear copper(I) complex 2 which exhibits the catalytic phenolase and catecholase activity of tyrosinase.
Abstract: The synthesis is reported of a binuclear copper(I) complex 2 which exhibits the catalytic phenolase and catecholase activity of tyrosinase.
Journal Article•
TL;DR: The Mg|(LB monolayer)|Pt structures of Z-β-(1-hexadecyl-4-quinolinium)-α-cyano-4 -styryldicyanomethanide (C 16 H 33 -Q3CNQ) show asymmetric currentvoltage characteristics; the behaviour is attributed to the organic monolayers although whether it is due to the presence of the permanent dipole moment or molecular rectification unclear as mentioned in this paper.
Abstract: The Mg|(LB monolayer)|Pt structures of Z-β-(1-hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide (C 16 H 33 -Q3CNQ) show asymmetric current-voltage characteristics; the behaviour is attributed to the organic monolayer although whether it is due to the presence of the permanent dipole moment or molecular rectification unclear
TL;DR: Upon encapsulating the ligand PhNH(CH2)6NH( CH2)4NH2, the nonadecacyclic molecular receptor cucurbituril exhibits a bimodal binding pattern contingent upon pH.
Abstract: Upon encapsulating the ligand PhNH(CH2)6NH(CH2)4NH2, the nonadecacyclic molecular receptor cucurbituril (C36H36N24O12) exhibits a bimodal binding pattern contingent upon pH.
TL;DR: In this paper, the photophysical properties of Eu3+, Tb3+, and Gd3+ ions are investigated and the Tb 3+ complex exhibits a high luminescence quantum yield (0.2) and a long luminecence lifetime (1.5 ms) upon ligand excitation in aqueous solution.
Abstract: Complexes in which the Eu3+, Tb3+, and Gd3+ ions are encapsulated in the p-t-butylcalix[4]arene-tetra-acetamide ligand, (1) have been synthesized and their photophysical properties investigated; the Tb3+ complex exhibits a high luminescence quantum yield (0.2) and a long luminescence lifetime (1.5 ms) upon ligand excitation in aqueous solution.
TL;DR: The resolution of (±)-2-azabicyclo[2.2.1]hept-5-en-3-one (3), a versatile intermediate in the synthesis of carbocyclic nucleosides, is described as mentioned in this paper.
Abstract: The resolution of (±)-2-azabicyclo[2.2.1]hept-5-en-3-one (3), a versatile intermediate in the synthesis of carbocyclic nucleosides, is described; both optical forms of the lactam have been obtained in very high optical purity (> 98% enantiomeric excess) in rapid, facile, large-scale biotransformation processes using whole cell catalysts and the laevorotatory enantiomer has been converted into (–)-carbovir.
TL;DR: In this paper, hydrogen fluoride-induced protiodetrimethylsilylation of trimethyl silylethynyl(phenyl)iodonium tetrafluoroborate (TFLB) was demonstrated to be a reagent for α-ethynylation of β-dicarbonyl compounds.
Abstract: Hydrogen fluoride-induced protiodetrimethylsilylation of trimethylsilylethynyl(phenyl)iodonium tetrafluoroborate (5), prepared from bis(trimethylsilyl)ethyne (4), affords ethynyl(phenyl)iodonium tetrafluoroborate (1), a reagent for α-ethynylation of β-dicarbonyl compounds under mild conditions.
TL;DR: The crystal and molecular structures of the complexes [PdLCl] and [PtL(MeCN)][PF6] have been determined; in each case, the cyclometallated ligand behaves as a terdentate C,N,N-donor, analogous to 2,2′:6′,2″-terpyridine; in the case of the platinum complex metal-metal interactions are observed, giving rise to alternate long-short contacts [3.28(1), 4.59(1)A] between canons as discussed by the authors
Abstract: The crystal and molecular structures of the complexes [PdLCl] and [PtL(MeCN)][PF6](HL = 6-phenyl-2,2′-bipyridine) have been determined; in each case, the cyclometallated ligand behaves as a terdentate C,N,N-donor, analogous to 2,2′:6′,2″-terpyridine; in the case of the platinum complex metal–metal interactions are observed, giving rise to alternate long–short contacts [3.28(1), 4.59(1)A] between canons.
TL;DR: In this paper, the first preparation of spherical polyaniline particles was reported, having a "rice-grain" or "needle-shaped" morphology, and they were shown to have a similar properties to those of rice-grain or needle-shaped particles.
Abstract: To date polyaniline particles have only been prepared having a ‘rice-grain’ or needle-shaped morphology; we report here the first preparation, we believe, of spherical polyaniline particles.
TL;DR: In this paper, a dioxygen was oxidized stoicheiometrically by cobalt(III) trifluoroacetate in CF3CO2H solution at 150-180 °C and 10-40 atm.
Abstract: Methane has been oxidized stoicheiometrically by cobalt(III) trifluoroacetate in CF3CO2H solution at 150–180 °C and 10–40 atm to give methyl trifluoroacetate in 90 ± 10% yield based on CoIII, which is reduced to CoII; in the presence of O2(1–5 atm) the reaction becomes catalytic with respect to the cobalt(III) salt, giving methyl trifluoroacetate as the sole product of the oxidation of methane by dioxygen.
TL;DR: The [CrPb9(C0)3]4-anion has a bicapped square antiprismatic geometry and is the first structurally characterized example of a Pb9 cluster as mentioned in this paper.
Abstract: The [CrPb9(C0)3]4– anion, which has a bicapped square antiprismatic geometry, is the first structurally characterized example of a Pb9 cluster and is the first transition metal-plumbide cluster.
TL;DR: Sodium hexatitanate, Na2Ti6O13, with a tunnel structure, combined with oxidized Ru, was found to be an efficient photocatalyst for the complete decomposition of water.
Abstract: Sodium hexatitanate, Na2Ti6O13, with a tunnel structure, combined with oxidized Ru, was found to be an efficient photocatalyst for the complete decomposition of water.
TL;DR: A series of bowl-shaped dodeca-alkanoyloxy macrocyclic derivatives was described in this article, and four compounds of this series (1c-g) display a Dho columnar mesophase.
Abstract: A series of bowl-shaped dodeca-alkanoyloxy macrocyclic derivatives (1) is described; four compounds of this series (1c–g) display a Dho columnar mesophase.
TL;DR: Crown ether linked DNA-intercalators have shown an enhanced binding ability to DNA in the presence of certain kinds of metal ions, due to a cationic property given by the co-ordination of the crown ether moiety to the metal ions.
Abstract: Crown ether linked DNA-intercalators have shown an enhanced binding ability to DNA in the presence of certain kinds of metal ions, due to a cationic property given by the co-ordination of the crown ether moiety to the metal ions.