A Tetrakis(amidinato)dichromium Complex with a ̜Supershort̝ Chromium-Chromium Quadruple Bond

Avi Bino, F. Albert Cotton*, Wolfgang Kaim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

A Cr2(amidinato)4 compound has for the first time been prepared in the form of crystals suitable for structure determination, and the structure has been solved and refined by X-ray crystallography. The amidinato ligand used is [MeNCPhNMe]-. The complex crystallizes in space group Pi with Z=1. Unit cell dimensions are a=9.770 (2) υ, b=11.717 (2) υ, c=9.620 (2) υ, a=113,93 (2)°, β=104.48 (2)°, 7=101.30 (2)°, and V=918 (1) υ3. The Cr2(MeNCPhNMe)4 molecule has virtual D4hsymmetry and there is no axial coordination, since the four methyl groups on each end screen the axial positions very effectively. The Cr-Cr distance is 1.843 (2) υ, making this one of the shorter of the ̜supershort̝ Cr-Cr quadruple bonds. This structure thus provides further evidence that the long Cr-Cr distances found in all Cr2(O2CR)4 and Cr2(O2CR)4L2compounds are primarily the result of axial coordination.

Original languageEnglish
Pages (from-to)3566-3568
Number of pages3
JournalInorganic Chemistry
Volume18
Issue number12
DOIs
StatePublished - 1979
Externally publishedYes

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