Structural and physicochemical characteristics of tetrabutylammonium tetrahalogenoferrates(III), [(C4H9)4N][FeBr4-nCln]

A series of tetrahalogenoferrates(III), [FeBr4-nCln](-) (n = 0-4) stabilized with the tetrabutyl ammonium cation, of general formula [(C4H9)(4)N][FeBr4-nCln], has been synthesized. The crystal and molecular structure of [(C4H9)(4)N][FeCl4] was determined. The iron cation adopts slightly distorted tetrahedral coordination with two opposite angles smaller than tetrahedral one, two equal to tetrahedral and two larger than tetrahedral. The bond valences were computed. The total valence of iron atom is equal to 3.08. In the structure can be found only one hydrogen bond C(l)-H center dot center dot center dot Cl. Except mentioned there are no unusually intermolecular short contacts between ions existing in the structure. All [(C4H9)(4)N][FeBr4-nCln] (n=04) compounds are isostructural in solid state.