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oa South African Journal of Chemistry - Simulating the agostic interaction in electron-deficient (16-e) group (VI) ML6 complexes : [M(CO)5(C(Me)OMe)] (2+) (M = Cr, Mo, and W) as models : research article

 

Abstract

A large number of theoretical studies have focused on understanding the molecular features of the agostic interaction in various kinds of molecular environments. However, there is a lack of electronic structure information about the agostic interaction in electron-deficient group (VI)ML organometallic complexes. In this simulation study, a unique case of an intramolecular stabilizing interaction has been discovered and evaluated. A geometric analysis revealed that beta-(C-H) and alpha-(C-C) can occupy the seventh and eighth coordination sites in the title Fischer carbene complexes as agostic interactions, which allows classifying the carbene as a 3 ligand in these cases. This theory was supported by the relative energies of the conformers and an NBO analysis. Both C2-C1 () and C2-H1 () were found to interact with the antibonding orbital of M-C6 (*), therefore these interactions are classified as *. These two simultaneous interactions have significant impact on the carbene characteristics; the structure, the atomic charges, infrared stretching vibrations (C-H, C-C, and C-O), and the 1H and the 13C-NMR chemical shifts. From a fundamental organic-organometallic chemistry point of view, this is a new addition to the orbital interaction theory and to group (VI) chemistry.

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/content/chem/64/1/EJC24569
2011-01-01
2016-12-04
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