Cobalt(<scp>III</scp>) alkyl complexes of 1,2-bis(2-pyridinecarboxamido)benzene (H<sub>2</sub>bpb) and 4,5-dichloro-1,2-bis(2-pyridinecarboxamido)benzene (H<sub>2</sub>bpc) and X-ray crystal structures of [Co(bpc)(CH<sub>2</sub>CH<sub>2</sub>CMeCH<sub>2</sub>)(H<sub>2</sub>O)] and [Co(bpb)Et(H<sub>2</sub>O)]
作者:Shing-Tat Mak、Wing-Tak Wong、Vivian Wing-Wah Yam、Ting-Fong Lai、Chi-Ming Che
DOI:10.1039/dt9910001915
日期:——
A series of organo and non-organo cobalt complexes of bpb and bpc ligands [H2bpb = 1,2-bis(2-pyridinecarboxamido)benzene, H2bpc = 4,5-dichloro-1,2-bis(2-pyridinecarboxamido)benzene] have been synthesised. Complexes prepared include Na[CoL(CN)2], Na[CoL(N3)2], [CoL(py)2]ClO4 and [CoL(R) (H2O)] (L = bpb or bpc; py = pyridine; R = Me, Et, Pr(i) or CH2CH2CMe = CH2). The complex [CoL(CH2CH2CMe = CH2) (H2O)] was formed as a rearrangement product from the reaction of 3,3-dimethylallyl bromide and [CoL].H2O in the presence of NaBH4 and NaOH in methanol. The complexes [Co(bpc) (CH2CH2CMe = CH2) (H2O)] 1 and [Co(bpb)Et(H2O)] 2 have been characterized by X-ray crystallography: 1, space group Pnma, a = 13.934(2), b = 12.204(2), c = 13.173(2) angstrom, Z = 4, and R = 0.046 for 1129 observed reflections; 2, space group Pnma, a = 15.072(1), b = 12.119(2), c = 9.884(3) angstrom, Z = 4, and R = 0.034 for 1387 observed reflections. Electrochemical studies on the one-electron oxidation of these complexes suggest the involvement of the equatorial ligand in these processes.