Infrared spectra (400–135 cm.–1) of some thiourea co-ordination complexes

Abstract

Infrared spectra in the range 400–135 cm.^–1 are reported for the complexes M(tu)₄Cl₂(tu = thiourea, M = Mn, Ni, Pd), [M(tu)₂X₂](M = Co,Zn, Cd; X = Cl, Br, I), and [Ni(tu)₆]X₂(X = Br, NO₃). The metal–sulphur stretching vibrations were observed mainly in the range 300–200 cm.^–1, while metal–halogen stretching frequencies for the tetrahedral complexes were similar to those of the MX₄^2– ions. The assignment of some lower-energy bands is also considered.