13476-79-4Relevant articles and documents
Trinuclear triangular copper(II) clusters - Synthesis, electrochemical studies and catalytic peroxidative oxidation of cycloalkanes
Di Nicola, Corrado,Garau, Federica,Karabach, Yauhen Y.,Martins, Luisa M. D. R. S.,Monari, Magda,Pandolfo, Luciano,Pettinari, Claudio,Pombeiro, Armando J. L.
, p. 666 - 676 (2009/05/06)
The reactions of CuII carboxylates (valerate, 2-methylbutyrate, hexanoate, heptanoate) with pyrazole (Hpz) in EtOH or EtOH/water solutions easily afford the triangular trinuclear copper derivatives [Cu 3(μ3-OH)(μ-pz)3(RCOO)2(L) x] [R = CH3(CH2)3, L = H 2O, x = 1 for 5; R = CH3CH2CH(CH3), L = EtOH, x = 2 for 6; R = CH3(CH2)4, L = EtOH, x = 1 for 7; R = CH3(CH2)5, L = EtOH, x = 1 for 8] as it has been previously found for R = H, L = Hpz, x = 2, (1); R = CH3, L = Hpz, x = 1, (2); R = CH3CH2, L = EtOH, x = 1, (3) and [Cu3(μ3-OH)(μ-pz) 3-(CH3(CH2)2COO)2(MeOH) (H2O)], (4). The trinuclear structure common to 5-8 has been assigned on the basis of magnetic susceptibility studies, ESI MS, IR and UV/Vis spectroscopy as well as 1H NMR measurements. The room temp. magnetic susceptibilities of 5-8 almost correspond to the presence of a single unpaired electron for each trinuclear unit. The IR spectra exhibit signals due to the bridging μ3-OH in accordance with what was observed in the spectra of 1-4. Solid-state and MeOH solution UV/Vis spectra show the same features previously reported for 1-4 and 1H NMR spectra of 1-8 show almost identical low field signals that can be assigned to pz- hydrogens. A detailed investigation of the supramolecular structures of 1 and 4 and the single-crystal X-ray study of the polymeric paddlewheel Cu(2-methylbutyrate) 2, A, are also reported. Electrochemical experiments show that in 1-8 the CuII ions can be reduced, in distinct steps, to CuI and Cu0. All the complexes act as catalysts or catalyst precursors for the efficient peroxidative oxidation, by aqueous hydrogen peroxide in acetonitrile and at room temp., of cycloalkanes RH (cyclohexane and cyclopentane) to the corresponding cyclic alcohols and ketones, with overall yields of up to 34% and TONs up to 42. Radical pathways involving the formation of alkyl hydroperoxides (ROOH) are involved. Wiley-VCH Verlag GmbH & Co. KGaA, 2009.
Molar volume and apparent molar volume of copper(II) soap+methanol + benzene system at various temperatures
Mehta,Talesara,Sharma, Rashmi
, p. 383 - 387 (2007/10/03)
Studies on density of copper(II) soaps in mixture of benzene + methanol at various temperatures (40,45,50,55°C) have been made. The cmc values in higher volume percent of methanol are higher than those in higher volume percent of benzene. With regard to chain length of soaps cmc values follow the order C6>C8. Masson equation has been applied successfully to interpret apparent molar volume of copper soaps in benzene + methanol. The studies of temperature effect on various interactions suggest that interactions between soap-solvent molecules increase with the rise in temperature when non-polar hydrocarbon is predominant in the solvent mixture whereas soap-soap interactions increase with the rise in temperature when methanol is predominant at below and above cmc.