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Novel Copper (novel + copper)
Selected AbstractsA Novel Copper(I) Halide Framework Templated by Organic,Inorganic Hybrid Polyoxometalate Chains Formed In Situ: A New Route for the Design and Synthesis of Porous FrameworksEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 22 2006Hua Jin Abstract A 1D organic,inorganic hybrid polyoxometalate chain has been used as a non-coordinating anionic template for the construction of a novel 3D copper halide 4,4,-bipy framework, namely [Cu3ICl(4,4,-bipy)4][CuII(1,10-phen)2Mo8O26]. X-ray diffraction experiments revealed that the title compound consists of chloride-bridged trinuclear CuI units linked by neutral organic 4,4,-bipy groups into a 3D framework with hexagon-like channels in which 1D organic,inorganic hybrid polyoxometalate chains reside. This is the first example of a 1D organic,inorganic hybrid polyoxometalate chain functioning as a novel anionic template for the construction of a 3D framework. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] ChemInform Abstract: Two Novel Copper,Undecaniobates Decorated by Copper,Organic Cations [{Cu(H2O) L}2{CuNb11O35H4}]5- (L: 10-Phenanthroline, 2,2,-Bipyridine) Consisting of Plenary and Monolacunary Lindqvist-Type Isopolyniobate Fragments.CHEMINFORM, Issue 40 2010Jing-Yang Niu Abstract Compounds (III) and (IV) represent the first examples of copper undecaniobates. [source] Aerobic Oxidation of Benzylic Alcohols in Water by 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)/Copper(II) 2- N -Arylpyrrolecarbaldimino ComplexesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 16 2009Abstract Novel copper(II) 2- N -arylpyrrolecarbaldimine-based catalysts for the aerobic oxidation of benzylic alcohols mediated by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical are reported. The catalytic activity for both synthesized and in situ made complexes in alkaline water solutions was studied revealing high efficiency and selectivity (according to GC selectivity always >99%) for both of these catalytic systems. For example, quantitative conversion of benzyl alcohol to benzaldehyde can be achieved with the in situ prepared bis[2- N -(4-fluorophenyl)-pyrrolylcarbaldimide]copper(II) catalysts in 2,h with atmospheric pressure of O2 at 80,°C. Interestingly, these catalysts can utilize dioxygen as well as air or hydrogen peroxide as the end oxidants, producing water as the only by-product. [source] Novel copper(II) heterochelate: synthesis, structural features and fluorescence studiesAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 7 2010G. J. Kharadi Abstract Fluorescence properties of four based derivatives [An] (where n = 1,4) and their Cu(II) heterochelates of the type [Cu(An)(CQ)(OH)],xH2O {where A1 = 3-(2-oxo-2H-chromen-3-yl)-4H-furo[3,2-c]chromen-4-one, A2 = 8-methyl-3-(2-oxo-2H-chromen-3-yl)-4H-furo[3,2-c]chromen-4-one, A3 = 6-methyl-3-(2-oxo-2H-chromen-3-yl)-4H-furo[3,2-c]chromen-4-one, A4 = 8-chloro-3-(2-oxo-2H-chromen-3-yl)-4H-furo[3,2-c]chromen-4-one and x = 3, 2, 4, 1} were studied at room temperature. The fluorescence spectra of heterochelates show red shift, which may be due to the chelation by the ligands to the metal ion. It enhances ligand ability to accept electrons and decreases the electron transition energy. The kinetic parameters such as order of reaction (n), energy of activation (Ea), entropy (,S#), pre-exponential factor (A), enthalpy (,H#) and Gibbs free energy (,G#) have been reported. The antimicrobial activity of Clioquinol and Cu(II) heterochelates have been determined and described. All the heterochelates showed a more effective antimicrobial activity than the free ligand. Copyright © 2010 John Wiley & Sons, Ltd. [source] Sequential Copper-Catalyzed Rearrangement,Allylic Substitution of Bicyclic Hydrazines with Grignard ReagentsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 6 2009Stefano Crotti Abstract The problem of the synthesis of trans- 1,4-disubstituted hydrazino- and aminocyclopentenes has been resolved by a sequential copper-catalyzed rearrangement,allylic alkylation of 2,3-diazabicyclo[2.2.1]heptenes. The cis -fused 5,5-membered allylic carbazate which is formed in situ by a novel copper(II) triflate [Cu(OTf)2]/(±)-BINAP-catalyzed rearrangement, can be alkylated with a broad spectrum of Grignard reagents with a predominant SN2,-regioselectivity. The N-Boc protecting group proved to be optimal as regards yields, reaction times and regioselectivities. [source] Cu[Al(ORF)4] Starting Materials and their Application in the Preparation of [Cu(Sn)]+ (n=12, 8) ComplexesCHEMISTRY - A EUROPEAN JOURNAL, Issue 27 2009Gustavo Santiso-Quiñones Dr. Abstract Naked copper,? A newly developed simple two-step route to weakly coordinated CuI starting materials that were used to prepare novel copper,cyclosulfur adducts, including the first M+,S12 complex (see figure, RF= C(CF3)3, C(CH3)(CF3)2, or CH(CF3)2). Reactions with the [Al{OC(CF3)3}4], counterion mimic gas-phase chemistry inside a mass spectrometer (to form [Cu(S12)]+). An effective route to stable, almost-"naked" CuI salts of weakly coordinating anions (WCAs) of the type [Al(ORF)4], has been developed. Born,Fajans,Haber cycles and theoretical calculations suggest that this methodology is useful for the generation of CuI salts regardless of the larger WCA used. The first homoleptic CuI,arene complex [Cu(1,2-F2C6H4)2]+[Al{OC(CF3)3}4], (1), the first CuI,methylenechloride complex [Cu(CH2Cl2)Al{OC(CH3)(CF3)2}4] (2), and the donor-free dimer [CuAl{OCH(CF3)2}4]2 (3) were synthesized in quantitative yields by sonicating Li[Al(ORF)4] (RF=C(CF3)3, C(CH3)(CF3)2, or CH(CF3)2), AgF, and a three-fold excess of CuI in 1,2-F2C6H4 (1) or CH2Cl2 (2, 3). Substances 1,3 are good starting materials for further CuI chemistry, and the reaction of 1,3 with the weak Lewis base cyclooctasulfur gave the first CuI,sulfur complexes of type [Cu(S12)(S8)]+[Al{OC(CF3)3}4], (4), [Cu(CH2Cl2)(S12)]+[Al{OC(CF3)3}4], (5), [A1Cu(1,5-,1,,1 -S8)CuA1] (6; A1=[Al{OC(CH3)(CF3)2}4],), and a CuI,S8 1D coordination polymer with [Cu2(S8)2A22] (7; A2=[Al{OCH(CF3)2}4],), as a monomeric repeat unit. Complexes 4 and 5 are the first example of any metal coordinated to cyclo-S12 and 4 is the first example of a complex having an element in two allotropic modifications as a ligand. [source] Synthesis, Crystal Structures and Thermal Stabilities of [Cu(bpp)2(bpdc)(H2O)2]n·2nH2O and [Cu(bpp)2]n·n (tdc) ·7.5nH2OCHINESE JOURNAL OF CHEMISTRY, Issue 10 2008Jing-Hua YU Abstract Two novel copper(II) coordination polymers [Cu(bpp)2(bpdc)(H2O)2]n·2nH2O (1) and [Cu(bpp)2]n·n(tdc)·7.5nH2O (2) (H2bpdc=biphenyl-4,4,-dicarboxylic acid, bpp=1,3-di(4-pyridyl)propane and H2tdc=thiophene-2,5-dicartboxylic acid) have been synthesized by the reactions of Cu(NO3)2 and bpp with the H2bpdc or H2tdc, respectively at room temperature. In the complexes 1 and 2, their Cu atoms have a distorted octahedral geometry, and two water molecules coordinate weakly to the Cu atom in the long axial direction. Both complexes have one-dimensional linear polymer structures. In complex 1, both carboxylate groups of the bpdc can coordinate to Cu atom, while both carboxylate groups of the tdc dianion in complex 2 do not coordinate to the Cu atom, which only balance the charge. In the both complexes, the bpp ligand has different conformation: trans - trans in complex 1 and trans - gauche in complex 2. The thermal gravimetric analyses indicate that both complexes are stable under 110 and 160 °C, respectively. [source] | ||||||||||||||||||||||