A spectroscopic study of sulphide, selenide, and telluride complexes of palladium(II) and mercury(II)

Abstract

trans-Square planar complexes of the type PdX₂L₂ (X = Cl, Br, I, NO₃, NO₂ and L = R₂S, Et₂Se, Et₂Te, PhRS, PhEtSe) have been prepared and studied using low-frequency i.r., ¹H N.M.R., and u.v.-visible spectroscopic techniques. The i.r. and u.v.-visible spectral bands have been assigned. The ¹H N.M.R. spectra have proved informative in separating out the different electronic effects transmitted through both the bonding system as well as through space. Evidence for low temperature inversion about the pyramidal sulphur atom has been obtained for a number of complexes. The dimeric, halogen-bridged mercury(II) complexes [HgX₂L]₂ (X = Cl, Br; L = R₂S Et₂S, Et₂Te and X = I; L = Et₂Se) have been isolated and studied in a similar manner.