[Studies on FT-Raman spectra of II B-metal complexes with ligand dmit and dmid].

The powder solid state FT-Raman spectra of four unsymmetric dithiolate complexes with formulas (Me4N)2 [M(Ln) (SPh)2] (M=Cd and Zn, L1 = dmit = 1,3-dithiole-2-thione-4,5-dithiolate, L2 = dmid = 1,3-dithiole-2-one-4,5-dithiolate, SPh = thiophenolate) (2-5) and [Bu4 N]2 [Zn(dmit) 2] (1) were studied and characterized by changing the structures of ligands or the metals of the complexes. The blue shift of the C==C peak around 1420 cm(-1) is about 38 cm(-1) when the dmit2- is replaced by dmifd2- . When Zn2+ is replaced by Cd2+ , or dmit2- is replaced by dmid2- , the 990 cm(-1) peaks of the pentacyclic ring shift to red by about 11 and 7 cm(-1) respectively. Two peaks at 463 and 300 cm(-1) were assigned to stretching vibration and bending vibration respectively for the S--C--S bond of S2 C==CS2 in dmit2- or dmid2- . Red shifts of those two peaks are found when dmit2- is replaced by SPh- , or Zn2+ is replaced by Cd2+ ; but they will shift to blue when dmit2- is replaced by dmid2- . There are two peaks of Cd-S vibrations with the sulfur atom from thiophenolate and from the ligands dmit2- or dmid2- , which are at about 180 and 140 cm(-1) respectively. Just like Cd-S, the vibration of Zn--S has two peaks as well, which are at about 193 and 155 cm(-1), respectively.