104267-57-4Relevant academic research and scientific papers
Transmetalation of tetranuclear copper complexes. 9. Stoichiometry and kinetics of transmetalation of (μ4-O)[NCu]4X6 Complexes by M(NS)2 reagents in aprotic solvents
Davies, Geoffrey,El-Sayed, Mohamed A.,El-Toukhy, Ahmed
, p. 3899 - 3903 (2008/10/08)
Tetranuclear copper(II) complexes (μ4-O)[(DENC)Cu]4X6 (A; DENC = N,N-diethylnicotinamide; X = Cl, Br) are stoichiometrically transmetalated by 1 mol of structurally characterized M(NS)2 reagents (NS is a monoanionic S-methyl hydrazine-carbodithioate Schiff base; M = Co, Ni, Zn) in aprotic solvents. The chromatographically isolated products are equimolar tetranuclear (μ4-O)[(DENC)4Cu3M(H2O)]X 6 and Cu(NS)2. Reactants A and products (μ4-O)[(DENC)4Cu3M(H2O)]X 6 have electronic spectral features at 775 and 850 nm. The rate laws for reactions of excess A with M(NS)2 in methylene chloride and nitrobenzene depend on X, M, and the structure of the NS ligand. The proposed mechanisms contain common Cu-X-M-S rings that facilitate metal replacement in A; however, metal replacement apparently is not rate-determining in the majority of the 18 systems investigated.
