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Open Access Crystal structure of dichlorido(4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane)iron(III) hexafluoridophosphate

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The title compound, [FeCl2(C14H30N4)]PF6, contains Fe3+ coordinated by the four nitrogen atoms of an ethylene cross-bridged cyclam macrocycle and two cis chloride ligands in a distorted octahedral environment. In contrast to other similar compounds this is a monomer. Intermolecular C—H...Cl interactions exist in the structure between the complex ions. Comparison with the mononuclear Fe2+ complex of the same ligand shows that the smaller Fe3+ ion is more fully engulfed by the cavity of the bicyclic ligand. Comparison with the μ-oxido dinuclear complex of an unsubstituted ligand of the same size demonstrates that the methyl groups of 4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane prevent dimerization upon oxidation.
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Document Type: Research Article

Affiliations: 1: Department of Chemistry and Physics, Southwestern Oklahoma State University, Weatherford, OK 73096, USA 2: Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, England

Publication date: January 1, 2015

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