Abstract
The binuclear cyanoferrate, tetraphenylphosphonium pentacyanoiron(III)-μ-cyano-amminetetracyanoiron(III), [(C 6H 5) 4P] 4[Fe 2(CN) 10NH 3] 4−, was synthesized by air oxidation of aqueous solutions of Na 3[Fe(CN) 5NH 3] · 3H 2O. Single crystal X-ray diffraction studies show the compound to contain the binuclear, cyano-bridged anion, [(NC) 5FeNCFe(CN) 4NH 3] 4−. This compound is structurally identical to the one prepared by A. Ludi et al., [Inorg. Chim. Acta, 34, 113 (1979)], with the exception that [Fe(CN) 6] 3− is not required for the synthesis of this compound. The Fe(III) atoms are antiferromagnetically coupled through the CN − bridge, as shown by a maximum in the magnetic susceptibility at 50 K. The electronic and IR spectra of the complex in the solid state and in solution are discussed.
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