Abstract
A nitrido-bridged iron phthalocyanine has recently been shown to catalyze hydrocarbon activation, displaying in this respect distinctly different reactivity than the monomeric phthalocyanine or the oxo-bridged dimer. Here, DFT calculations are shown on models of this catalyst, indicating a distinct difference in electronic structures between the μ-oxo and μ-nitrido-bridged dimers, with the nitride acting as a remarkable charge reservoir and acquiring S = 1 N-character while the oxo bridge remains redox-inert; this difference in charge localization appears to be mirrored by a tendency towards higher symmetry in the Fe–N/O bonds with the nitrido bridge compared to the oxo one, and by a tendency of the nitride to favour lower-spin states more efficiently than the oxide.
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