Abstract
A series of cyclometallated complexes of the nitrogen donor ligands, azobenzene, N, N-dimethylbenzylamine, 8-methylquinoline, and benzo[ h]quinoline have been examined by 13C NMR. The total number of expected aromatic quaternary and CH carbon atom resonances were determined by comparison of the noise decoupled and single frequency off resonance decoupled spectra of a given complex. In this manner it can be readily determined that cyclometallation may have occurred. In those cases where metal- 13C coupling is observed an unambiguous determination of metal—carbon σ bond formation is achieved.
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