Crystal structure of hydrated diphenylguanidinium hexafluoroferrate (III)

The crystal structure of 3C13H14N3+FeF63−·3.5H2O was determined. Both phenyl rings of the diphenylguanidine cation are oriented syn to the central CNH2 group. The anions and cations are held together by a three-dimensional network of hydrogen bonds. In the synthesis of this compound, a second phase (iron trifluoride trihydrate) was formed and identified by powder diffraction data. Mössbauer results show two different iron environments compatible with the two phases reported.