Electroanalytical and spectrophotometric investigations on the metal(II)–1,2-bis(diphenylphosphino)ethane–acetylacetonate system (M = Ni, Pd, or Cu) in acetonitrile
[EN] SUBSTITUTED TRIFLUOROMETHYLOXADIAZOLES FOR COMBATING PHYTOPATHOGENIC FUNGI [FR] TRIFLUOROMÉTHYLOXADIAZOLES SUBSTITUÉS PERMETTANT DE LUTTER CONTRE DES CHAMPIGNONS PHYTOPATHOGÈNES
Reduction of copper(ii) complexes of tridentate ligands by nitric oxide and fluorescent detection of NO in methanol and water media
作者:Pankaj Kumar、Apurba Kalita、Biplab Mondal
DOI:10.1039/c1dt10773a
日期:——
to paramagnetic quenching, does not display any fluorescence; however, on addition of nitricoxide to a methanol or water solution of complex 4, the fluorescence intensity of the fluorophore has been found to be restored. This is attributed to the reduction of the Cu(II) center by nitricoxide to diamagnetic Cu(I). The turn-on of quenched fluorescence intensity has been observed both in methanol and
Electrochemistry of a labile average-valence dicopper system
作者:Joanne Coyle、Alison J. Downard、Jane Nelson、Vickie McKee、Charles J. Harding、Regine Herbst-Irmer
DOI:10.1039/b405587j
日期:——
Electrochemical studies on an average-valent dicopper cryptate demonstrate the existence of a solvent-assisted disproportionation in acetonitrile, which is absent in water. The existence of this process was confirmed via absorption spectroscopy, which allowed the evaluation of thermodynamic parameters. The disproportionation equilibrium is enthalpically controlled, and the results suggest an upper limit for the bond energy of the one-electron Cu–Cu bond of 200 kJ mol−1.
Heterobimetallic cluster cations from the reactions of diphosphazane-bridged derivatives of [Ru<sub>2</sub>(CO)<sub>9</sub>] with metal-containing electrophiles: mechanism of the one-electron oxidation of [Ru<sub>2</sub>(µ-CO)(CO)<sub>4</sub>{µ-(RO)<sub>2</sub>PN(Et)P(OR)<sub>2</sub>}<sub>2</sub>] by silver salts
作者:Dennis W. Engel、Raymond J. Haines、Edgar C. Horsfield、Jörg Sundermeyer
DOI:10.1039/c39890001457
日期:——
Reaction of [Ru2(µ-CO)(CO)4µ-(RO)2PN(Et)P(OR)2}2](R = Me or Pri) with [AuCl(PPh3)], [Cu(MeCN)4]+, and HgCl2 gives cationic products in which the metal substrate is either co-ordinated terminally as in [Ru2(HgCl)(CO)5µ-(RO)2PN(Et)P(OR)2}2]+ or in the bridging mode as in [Ru2µ-Au(PPh3)}(µ-CO)(CO)4µ-(RO)2PN(Et)P(OR)2}2]+, the structure of the latter being confirmed X-ray crystallographically; silver(I)
Thermal and Electrochemical C−X Activation (X = Cl, Br, I) by the Strong Lewis Acid Pd<sub>3</sub>(dppm)<sub>3</sub>(CO)<sup>2+</sup> Cluster and Its Catalytic Applications
作者:Frédéric Lemaître、Dominique Lucas、Katherine Groison、Philippe Richard、Yves Mugnier、Pierre D. Harvey
DOI:10.1021/ja0297786
日期:2003.5.1
The stoichiometric and catalytic activations of alkyl halides and acid chlorides by the unsatured Pd(3)(dppm)(3)(CO)(2+) cluster (Pd(3)(2+)) are investigated in detail. A series of alkyl halides (R-X; R = t-Bu, Et, Pr, Bu, allyl; X = Cl, Br, I) react slowly with Pd(3)(2+) to form the corresponding Pd(3)(X)(+) adduct and "R(+)". This activation can proceed much faster if it is electrochemically induced
Synthesis, Structure, Spectroscopic Properties, and Photochemistry of Homo- and Heteropolynuclear Copper(I) Complexes Bridged by the 2,5-Bis(2-pyridyl)pyrazine Ligand
Cu(I)-Cu(I) and Cu(I)-Ru(II) dinuclear complexesbridged by the 2,5-bppz (2,5-bis(2-pyridyl)pyrazine) ligand have been prepared and characterized including the X-ray crystallographic study of the dinuclear [CuI(PPh3)2}2(mu-2,5-bppz)](PF6)2)2CH3Cl complex: a = 13.974(2), b = 13.993(2), c = 13.537(2) A; alpha = 101.98(1), beta = 103.22(1), gamma = 113.90(1) degrees ; triclinic, P, Z = 1. The trinuclear