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Complexes of heterocyclic thiones and group 12 metals: Part VI. Preparation and characterisation of complexes of cadmium(II) halides with 1-methylimidazoline-2(3H)-thione, 1,3-thiazolidine-2-thione and 1,3-benzothiazoline-2-thione. Crystal structures of polymeric (1,3-thiazolidine-2-thione)cadmium(II) chloride, bis(1,3-thiazolidine-2-thione) cadmium(II) iodide

Lookup NU author(s): Emeritus Professor Bill Clegg, Dr Ross Harrington

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Abstract

Reactions of 1-methylimidazoline-2(3H)-thione (meimz2SH), 1,3-thiazolidine-2-thione (tzdSH) and 1,3-benzothiazoline-2-thione (bztzSH) with cadmium(II) halides in ethanol solutions result in the formation of 1:1 complexes for the chloride, both 1:1 and 2:1 complexes for the bromide, and only 2:1 complexes for the iodide. Spectroscopic evidence confirms the exocyclic sulfur atom to be the donor in all cases. Cadmium(II) acetate and the heterocyclic ligands in the presence of triethylamine form the insoluble deprotonated complexes. The structure of (tzdSH)CdCl2 consists of double halogen-bridged chains, linked into sheets via NH⋯Cl interactions and with the heterocycle coordinated to the metal via the exocyclic sulfur atom. Thus each cadmium is approximately octahedrally surrounded by one sulfur, 2 two-coordinate and 3 three-coordinate chlorine atoms. In contrast (tzdSH) 2CdI2 forms chains via I⋯S interactions; the metal is tetrahedrally coordinated by two sulfur and two iodine atoms. The structure of (meimz2SH)2CdBr2 consists of discrete complex molecules with essentially tetrahedrally coordinated Cd and no significant intermolecular interactions; the six molecules in the asymmetric unit are related by pseudo-symmetry and are very similar except for variation in the orientation of the heterocyclic substituents. © 2003 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Bell NA, Clegg W, Coles SJ, Constable CP, Harrington RW, Hursthouse MB, Light ME, Raper ES, Sammon C, Walker MR

Publication type: Article

Publication status: Published

Journal: Inorganica Chimica Acta

Year: 2004

Volume: 357

Issue: 7

Pages: 2091-2099

ISSN (print): 0020-1693

ISSN (electronic): 1873-3255

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.ica.2003.10.036

DOI: 10.1016/j.ica.2003.10.036


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