Penta- and hexa-coordinate adducts of bis(diaryldithiophosphinato) cobalt(II)

Abstract

Abstract Pentacoordinate adducts of composition Co(X)2(L) where X = diphenyldithiophosphinato or di(p-tolyl)dithiophosphinato and L = α-picoline, β-picoline, λ-picoline, 2-aminopyridine, quinoline and isoquinoline and the hexacoordinate adducts Co(X)2(L)2 where L = pyridine, λ-picoline and isoquinoline are reported. The spectral studies and magnetic measurements over a temperature range 79−350°K are consistent with the proposed pentacoordinate structure for 1:1 adducts and hexacoordinate structure for 1:2 adducts. Thermal decomposition of the adducts leads to the conclusion that the steric effects are likely to be responsible for the formation of 1:1 adducts.