Complex compounds of iron(II, III) with 2-(2′-pyridyl)benzimidazole

Abstract

Complex compounds of iron(II,III) with 2-(2′-pyridyl)benzimidazole (PBZ) of the types: (a) [Fe(PBZ) 3]X 2. nH 2O (where X = Cl −, Br −, I −, NO 3 −, ClO 4 −, and 1 2 SO 4 2−; (b) [Fe(PBZ) 2X 2].2H 2O (X = NCS − or CN −); and (c) [Fe(PBZ) 2(H 2O) 2]X, (where X = SO 4 2− , C 2O 4 2− and S 2O 3 2− ) are reported. The compound [Fe(PBZ) 2(NCS) 2] has been obtained in cis and trans form. The complexes show room temperature magnetic moments in the range, 4.96–5.46 B.M., corresponding to 5T 2g state. From the electronic reflectance spectra the crystal field parameters 10Dq, B and β have been obtained. One binuclear complex, [(PBZ) 2(SO 4)FeOFe(SO 4)(PBZ) 2] 17H 2 and a trischelate [Fe(PBZ) 3]Cl 3 of iron(III) with 2T 2g ground state were also obtained.