Structural and spectroscopic consequences of a chemical change in an iron complex

18 Structural and spectroscopic consequences of a chemical change in an iron complex 

Molecular structures of (a) [LFeCl] and (b) [LFe( r.-0)FeL] hydrogen atoms are omitted for clarity. Courtesy of Prof Thorsten Glaser, University of Bielefeld. 

Each of the complexes can be thought of as formally derived from [LFe] , but they have different ligands at the fifth coordination site, chloride in [LFeCl] and a bridging oxygen in [LFe(p,-0)FeL]. The nature of this fifth ligand has a significant effect on their geometric and electronic structure, which can be probed by various spectroscopic techniques. 

LMCT transitions involving the phenolate ligands, while the low-energy bands at 17500cm for [LFeCl] and at 23200 cm for [LFe( jL-0)FeL] correspond to — dij. phenolate LMCT transitions (in the latter 

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