title: trans-Tetrachlorobis(N, N'-dimethylimidazolidine-2-thione)tellurium(IV), a thiourea complex of tellurium with asymmetric Te-S bonds
abstract: The structure of the title compound, [TeCl(4)(C(5)H(10)N(2)S)(2)] or C(10)H(20)Cl(4)N(4)S(2)Te, has been solved in order to study the stereochemical activity of the lone pair of electrons on Te(IV). The two crystallographically independent molecules in the asymmetric unit both show a distorted octahedral coordination of the Te atom. The two Te-S bonds are trans to each other in both molecules and are greatly asymmetric, with bond lengths of 2.5686 (7) versus 2.8557 (8) A and 2.5859 (7) versus 2.8165 (9) A. The Te-Cl bond lengths lie in the range 2.5236 (7)-2.5589 (8) A. The asymmetric Te-S bonds and a large S-Te-Cl angle of ca 97 degrees involving the long Te-S bonds indicate stereochemical activity of the lone pair of electrons on Te.
authors.affiliation: Department of Chemistry, University of Bergen, Allegaten 41, 5007 Bergen, Norway. steinar.husebye@kj.uib.no.
authors.initials: S
authors.lastname: Husebye
authors.initials: KW
authors.lastname: Tornroos