Iron complexes of the dibenzophospholyl ligand: a synthetic and crystallographic study

Abstract

Iron complexes bearing the dibenzophospholyl (DBP) ligand have been prepared. Reaction of DBP-Li with CpFe(CO)2Br gave [(µ2-DBP)Fe2Cp2(CO)4]Br and reaction of DBP-Li with CpFe(CO)2I gave [(µ2-DBP)Fe2Cp2(CO)4]I. Reaction of bis(1,1'-dibenzophospholyl) and [CpFe(CO)2]2 yielded a mixture of cis- and trans-(µ2-DBP)2Fe2Cp2(CO)2. The mixture was also obtained on heating of [(µ2-DBP)Fe2Cp2(CO)4]X (X = Br, I). The ligands are sigma-bonded through the phosphorus atom in all complexes. The compounds were characterized by 1H, 13C, and 31P NMR and IR spectroscopies, mass spectrometry, micro analysis, and X-ray diffraction.Key words: dibenzophospholyl, iron, heterocycle.