Homoleptic Cyclohexanethiolato Complexes of Mercury(II)

DOI: 10.1039/DT9920001393

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1393 - 1400 (1992)

Update date:2022-08-04

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Authors:

Alsina, Teresa

Clegg, William

Fraser, Kelly A.

Sola, Joan

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Article abstract of DOI:10.1039/DT9920001393

The complexes Hg(SR)2 1 and (R'=Et 2 or Me 3) have been obtained from the reaction of HgCl2 with NaSR in acetonitrile, with Cl also present for complexes 2 and 3; SR is cyclohexanethiolate.Complex 1 has a polymeric structure consisting of rather bent Hg(SR)2 units linked together by weaker Hg-S bonds <3.004(2) and 2.959(2) Angstroem>; the Hg atoms have highly distorted tetrahedral co-ordination and each thiolate acts as a very asymmetric bridge between two Hg atoms.Complex 2 contains Hg atoms in a distorted trigonal-planar co-ordination environment, the monomeric anions being well separated from each other.The distorsion is mostly in-plane, producing one angle considerably less than, and one considerably greater than, the ideal 120 deg; the largest angle lies opposite the longest Hg-S bond, and the smallest angle opposite the shortest Hg-S bond.Proton and 13C NMR, far-IR and Raman, and low-energy UV spectroscopic data are discussed.The UV data afford additional support for the proposal of a trigonal-planar ^- co-ordination environment for the metal receptor site of the MerR metalloregulatory protein.A correlation of co-ordination geometry, Hg-S bond lengths, and Hg-S stretching frequencies is developed for these and other homoleptic thiolate complexes of mercury.

Full text of DOI:10.1039/DT9920001393

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