The infrared spectra of some phenyl-substituted pentavalent antimony compounds

Abstract

In compounds of the type Ph 3SbY 2 and (Ph 3Sb-O-SbPh 3Y 2 the C(Ph)-Sb asymmetric stretching frequency occurs between 471 and 445 cm -2. Absorption due to Sb-O-Sb occurs near 750 cm -2. In triphenylantimony dinitrate the nitrate group is considerably more covalent than in trimethylantimony dinitrate. The spectral results with compounds of the type Ph 3SbY 2 are consistent with a trigonal bipyramidal molecule. X-ray diffraction studies by previous workers have clearly demonstrated such a structure for only Ph 3SbCl 2. Oxybis(triphenylantimony) diperchlorate appears to contain a perchlorate ion. The other compounds of the type (Ph 3Sb-O-SbPh 3)Y 2 which we have studied appear to be covalent and probably consist of two trigonal bipyramidal Ph 3SbY groups sharing an apical oxygen atom.