Synthesis and Structural Characterization of Iron(II) Derivatives of Heterocyclic Tridentate Amines

Compounds of general formula FeX 2(L) {L=2,6-bis(3,5-dimethyl-N-pyrazolyl)pyridine, C 15H 17N 5; bis[3,5-dimethyl-N-pyrazolyl)methyl]-isopropylamine, C 15H 25N 5; bis(benzimidazol-2-yl-methyl)amine, C 16H 15N 5, 1,3-bis(benzimidazolyl)propane, C 17H 16N 4; bis(benzimidazolyl-2-methyl)ether, C 16H 14N 4O; bis(benzimidazolyl-2-methyl)thioether, C 16H 14N 4S} have been synthesized by reacting the amine with Fe 4Cl 8(THF) 6 or FeI 2(CO) 4 in toluene. The complexes FeCl 2(C 15H 17N 5)·MeCN and FeCl 2(C 16H 15N 5)(MeOH) have been characterized by single crystal X-ray diffraction together with the parent triamines, C 15H 17N 5 and C 16H 15N 5, for comparison. The reaction of FeI 2(CO) 4 with bis(benzimidazolyl-2-methyl)thioether, C 16H 14N 4S, led to the product of partial carbonyl substitution FeI 2(CO) 2(C 16H 14N 4S).