Authors
Robert Wolf, Chengbao Ni, Tailuan Nguyen, Marcin Brynda, Gary J Long, Andrew D Sutton, Roland C Fischer, JC Fettinger, Matthew Hellman, Lihung Pu, Philip P Power
Publication date
2007/12/24
Journal
Inorganic chemistry
Volume
46
Issue
26
Pages
11277-11290
Publisher
American Chemical Society
Description
The effects of different terphenyl ligand substituents on the quintuple Cr−Cr bonding in arylchromium(I) dimers stabilized by bulky terphenyl ligands (Ar) were investigated. A series of complexes, ArCrCrAr (1−4; Ar = C6H2-2,6-(C6H3-2,6-iPr2)2-4-X, where X = H, SiMe3, OMe, and F), was synthesized and structurally characterized. Their X-ray crystal structures display similar trans-bent C(ipso)CrCrC(ipso) cores with short Cr−Cr distances that range from 1.8077(7) to 1.8351(4) Å. There also weaker Cr−C interactions [2.294(1)−2.322(2) Å] involving an C(ipso) of one of the flanking aryl rings. The data show that the changes induced in the Cr−Cr bond length by the different substituents X in the para positions of the central aryl ring of the terphenyl ligand are probably a result of packing rather than electronic effects. This is in agreement with density functional theory (DFT) calculations, which predict that the model …
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R Wolf, C Ni, T Nguyen, M Brynda, GJ Long, AD Sutton… - Inorganic chemistry, 2007