Synthesis and molecular structures of dimeric assemblies of telluronium salts derived from o-C6H4(CH2TeMe)(2) and PhMeTe

Hill, Nicholas J., Levason, William, Reid, Gillian and Ward, Antony J. (2002) Synthesis and molecular structures of dimeric assemblies of telluronium salts derived from o-C6H4(CH2TeMe)(2) and PhMeTe. Journal of Organometallic Chemistry, 642 (1-2), 186-190. (doi:10.1016/S0022-328X(01)01229-3).

Abstract

The ditelluroether, o-C6H4(CH2TeMe)(2) reacts with excess MeI in acetone to afford the bis(triorganotelluronium iodide), o-C6H4(CH2TeMe2I)(2), in high yield which has been characterised by H-1-, C-13{H-1}- and Te-125{H-1}-NMR spectroscopy, microanalysis and X-ray crystallography. The crystal structure of this species reveals a weakly associated dimer, assembled through a series of secondary (TeI)-I-... interactions to give a pseudo-cubane Te4I4 core, involving three-coordinate (pyramidal) iodine and six-coordinate (distorted octahedral) tellurium. The o-xylyl backbone units are oriented across the diagonal of two opposite faces of the cubane. This is the first crystallographic study of a triorganotelluronium halide salt derided from a ditelluroether, The crystal structure of PhTeMe2I shows a weakly associated mu(2)-diiodo bridged dimer, in this case with two-coordinate iodine and five-coordinate, distorted square pyramidal tellurium. The stereochemical activity of the Te-based lone pair is discussed for each system and the structures are compared with other related species.

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Contributors

Author: William Levason

Author: Gillian Reid

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