Abstract
The singlet and lowest-lying triplet states of the univalent group 13 ligands MeM, (η5-C5H5)M, (η5-C5Me5)M, and (H3Si)2NM (M = B, Al, Ga, In) have been investigated by DFT methods. Each ligand possesses a singlet ground state. Four models were considered for the interaction of these ligands with the Fe(CO)4 fragment: a purely M → Fe σ-bonded model (A) supplemented by one back-bonding interaction from Fe to M (B), or a M → Fe σ-bonded model supplemented by two back-bonding interactions from Fe to M (C), and a MFe double-bonded model (D). In general, the DFT calculations indicated that the RM ligands behave as two-electron donors (i.e. bonding model A). The RM ligands with non π-bonding substitutents, R, were found to have some π-acceptor capability that would be appropriate for iron → ligand back-bonding. However, evidence for such an interaction was only found in the case of MeBFe(CO)4.
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