Dicyanobis-(1,10-phenanthroline)iron(II), phen2FeCN2, forms a diprotonated derivative in solution in anhydrous hydrogen fluoride; protonation probably takes place on the nitrogen atoms of the cyanide ligands. The 1H n.m.r. spectrum of such solutions shows that the protonated species exists entirely in the cis-configuration. A solid derivative, [phen2Fe(CNH)2](PF6)2, has been isolated.
M. F. A. Dove and J. G. Hallett, J. Chem. Soc. A, 1969, 1204 DOI: 10.1039/J19690001204
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