Structural and spectroscopic study of chelate carbonyl and phosphoryl antimony(v) complexes

Chelate complexes of antimony tetrachloride with dibenzoylmethane and (benzoylchloro-methyl)diphenylphosphine oxide were stndicd by X-ray diffraction, I R, and Raman spectroscopy. The antimony atom has a slightly distorted octahedral coordination in the complexes. The bond lengths in the chelate cycles are evidence for an appreciable electron delocalization in the O-C-C-C-0 and O-C-C-P-0 chains. Unlike the C₃O₂Sb chelate cycle, the chelate cycle with the phosphorus atom is nonplanar. The assignment of the stretching vibrations frequencies of the C-O, P-0, C-C, Sb-O, and Sb-CI bonds was presumably made on the basis of the IR and Raman spectral data.Deceased in 1995.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1474–1479, June, 1996.