Title

Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers

Abstract

Although, in principle, transition metals can form bonds with 6 shared electron pairs, only quadruply-bonded compounds can be isolated as stable species at room temperature. Now, reduction of {Cr(µ-Cl)Ar'}2 (Ar' = C6H3-2,6(C6H3-2,6-Pri2)2 Pri = isopropyl) with a slight excess of potassium graphite has produced a stable compound with fivefold Cr-Cr bonding. The very air and moisture sensitive, dark red crystals of Ar'CrCrAr' were isolated in >40% yield. X-ray diffraction revealed a Cr-Cr bond length of 1.8351(4) angstroms and a planar, trans-bent core geometry. These data, together with its temperature independent paramagnetism, as well as computational studies, support sharing of 5 electron pairs in 5 bonding molecular orbitals between two 3d5 chromium(I) ions.

Department(s)

Chemistry

Library of Congress Subject Headings

Crystals

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 American Association for the Advancement of Science (AAAS), All rights reserved.


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