SULPHUR-NITROGEN CHELATING AGENTS .7. 5-AND 6-COORDINATE COMPLEXES OF COBALT(2), NICKEL(2), AND COPPER(2) WITH AN S-N-S TRIDENTATE LIGAND

Mono-ligand complexes of the tridentate ligand N-(2-methylthiophenyl)- 2'-methylthiophenylmethyleneimine (SNS) of the type MX2(SNS) (M = Co, Ni, Cu; X = Cl, Br, I, or FCS) have been prepared. The electronic spectra indicate that the cobalt halide complexes are five-coordinate, whereas the complex Co(NCS)2- (SNS) and the nickel complexes are six- coordinate and polymeric. The copper complexes CuX2(SNS) (X = Cl, Br) are possibly five-coordinate. The bis-complexes of nickel [Ni(SNS)2]X2 (X = ClO4, BF4) are high- spin but the complex [Co(SNS)2](ClO4)2 appears to be a rare example of a low-spin octahedral complex of cobalt(II). © 1969, CSIRO. All rights reserved.