Bond-Stretch Isomerism in Transition-Metal Complexes

Yves Jean, Agusti Lledos, Jeremy K. Burdett, Roald Hoffmann

Research output: Contribution to journalArticleResearchpeer-review

86 Citations (Scopus)


The occurrence of bond-stretch isomers is now experimentally established via X-ray crystal structure determination. These are molecules, also called distortion isomers, whose only structural difference is a dramatic difference in the length of one (usually M—O) or several bonds. In this paper we provide two electronic mechanisms by which this may occur. One involves a real electronic crossing of filled and empty orbitals (a first-order Jahn—Teller effect) and the other a second-order Jahn—Teller distortion of the type important in other bond localization problems (allyl anion, benzene, etc.). The electronic conditions for optimal observation of each process are described for d 1 and d 2 transition-metal complexes. The ideas are extended to d 9 Cu 11 systems. © 1988, American Chemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)4506-4516
JournalJournal of the American Chemical Society
Issue number14
Publication statusPublished - 1 Jul 1988


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