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

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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.

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