Enhanced slip distortions in 1-phenyl-2-methyldicarbaplatinaboranes. Conformational destabilisation in the isomerisation of 1-phenyldicarbaplatinaboranes

Thomas D. McGrath, Alan J. Welch

Research output: Contribution to journalArticle

Abstract

The compounds TI2[7-Ph-8-Me-7,8-nido-C2B9H9], [C5H10NH2][7-Ph-8-Me-7,8-nido-C 2B9H10], 1-Ph-2-Me-3,3-L2-3,1,2-PtC2B9H9 [L = PMe2Ph, PEt3, PPh3 or P(C6H4Me-p)3] have been prepared and characterised. The platinum complexes were obtained from the reactions between TI2[7-Ph-8-Me-7,8-nido-C2B9H9] and the appropriate [PtCl2(PR3)2] species. Crystallographic studies upon the compounds where L = PEt3 and two crystalline modifications of that where L = PPh3 afforded evidence of a substantial influence of intramolecular crowding upon the observed structures, so that the lateral slippage (?) of the metal fragment is significantly enhanced: ? = 0.74 and 0.94 and 0.91 Å respectively. These compounds do not isomerise under conditions which produce rearrangement in the corresponding (less-congested) derivatives of 1-phenylcarbaborane, consistent with the proposed conformational destabilisation in the latter system.

Original languageEnglish
Pages (from-to)1755-1763
Number of pages9
JournalJournal of the Chemical Society, Dalton Transactions
Issue number10
DOIs
Publication statusPublished - 1995

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