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.
Recommended Citation
T. Nguyen et al., "Synthesis of a Stable Compound with Fivefold Bonding between Two Chromium(I) Centers," Science, American Association for the Advancement of Science (AAAS), Jan 2005.
The definitive version is available at https://doi.org/10.1126/science.1116789
Department(s)
Chemistry
Keywords and Phrases
Crystals
International Standard Serial Number (ISSN)
0036-8075
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.
Publication Date
01 Jan 2005
