Rogue Scholar

Published January 23, 2010 in Henry Rzepa's Blog

So ingrained is the habit to think of a bond as a simple straight line connecting two atoms, that we rarely ask ourselves if they are bent, and if so, by how much (and indeed, does it matter?). Well Hursthouse, Malik, and Sales, as long ago as 1978, asked just such a question about the unlikeliest of bonds, a quadruple Cr-Cr bond, found in the compound di-μ-trimethylsilylmethyl-bis-[(tri-methylphosphine)

References

Inorganic ChemistryOrganic ChemistryPhysical and Theoretical Chemistry

A Static Agostic .alpha.-CH.cntdot..cntdot..cntdot.M Interaction Observable by NMR Spectroscopy: Synthesis of the Chromium(II) Alkyl [Cr2(CH2SiMe3)6]2- and Its Conversion to the Unusual "Windowpane" Bis(metallacycle) Complex [Cr(.kappa.2-C,C'-CH2SiMe2CH2)2]2-

https://doi.org/10.1021/om00017a023

Published May 1, 1994 in Organometallics

Authors Paige M. Morse, Michael D. Spencer, Scott R. Wilson, Gregory S. Girolami

General Chemistry

Crystal and molecular structure of di-µ-trimethylsilylmethyl-bis[(tri-methylphosphine)(trimethylsilylmethyl)chromium(II)](4 Cr–Cr)

https://doi.org/10.1039/dt9780001314

Published January 1, 1978 in J. Chem. Soc., Dalton Trans.

Authors Michael B. Hursthouse, K. M. Abdul Malik, Keith D. Sales

Blisteringly bent (quadruple) bonds

References

A Static Agostic .alpha.-CH.cntdot..cntdot..cntdot.M Interaction Observable by NMR Spectroscopy: Synthesis of the Chromium(II) Alkyl [Cr2(CH2SiMe3)6]2- and Its Conversion to the Unusual "Windowpane" Bis(metallacycle) Complex [Cr(.kappa.2-C,C'-CH2SiMe2CH2)2]2-

Crystal and molecular structure of di-µ-trimethylsilylmethyl-bis[(tri-methylphosphine)(trimethylsilylmethyl)chromium(II)](4 Cr–Cr)