Abstract

Mixed doubles: The dimeric complex [{Fe(tim)}(2)] (see structure, tim = 2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene) represents an unprecedented complex containing an unsupported Fe-Fe bond. The crystal structure confirms the presence of reduced tim units, thus indicating ligand redox activity. Spectroscopic and computational studies establish a triplet ground state for [{Fe(tim)}(2)] and suggest a mixed-valence compound with respect to both the Fe ions and the ligands.

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