Ligating properties of tertiary phosphine/arsine sulphides or selenides—VI. Addition compounds of zinc(II), cadmium(II) and mercury(II) with sulphides or selenides of triphenyl- and tri- -tolylphosphines and 1,3-trimethylenebis (diphenylphosphine)

Post-transition elements react with ligands, triphenylphosphine sulphide or selenide (Ph₃PS or Ph₃PSe), tri-p-tolylphosphine sulphide or selenide (T₃PS or T₃PSe) and 1,3-trimethylenebis-(diphenylphosphine sulphide or selenide) (PDPS or PDPSe) in suitable organic solvents forming complexes of compositions: MX₂. L(M = Zn, X = I, L = all except Ph₃PS: M = Cd, X = I, L = T₃PS, T₃PSe, M = Hg, L = T₃PSe, X = Cl, Br, I); ZnI₂·2Ph₃PS, Hg(NO₃)₂·2Ph₃PS, CdBr₂·3T₃PSe and 3Hg(NO₃)₂·4Ph₃PSe. All these have been characterized through elemental analyses, ir spectra (4000−200 cm⁻¹) and molar conductance (nitrobenzene). Complexes are essentially nonelectrolytes. Tetrahedral structures have been assigned to all except a 1 : 3 complex which has been assigned a bridged octahedral structure.