VIBRATIONAL SPECTRA AND STRUCTURE OF ORGANOLEAD COMPOUNDS .2. TETRAPHENYLLEAD HEXAPHENYLDILIAD TRIPHENYLLEAD HALIDES AND DIPHENYLLEAD DIHALIDES

The infrared and Raman spectra of tetraphenyllead and of hexaphenyldilead have been recorded over the range 4000-70 cm-1 and assignments for the various fundamentals have been made. The spectra have been recorded both in the solid state and in solution. Those of hexaphenyldilead are consistent with the staggered ethane-type structure; the Pb-Pb stretching frequency in this molecule is at 114 cm-1 in the solid state and at 109 cm-1 in solution. The triphenyllead halides and the diphenyllead dihalides, where soluble, are shown to behave as monomers in benzene solution, and their infrared and Raman spectra over the range 450-70 cm-1 have been assigned satisfactorily on this basis. In the solid state, however, the spectra, as well as other evidence, suggest that the mono- and dihalides are polymeric by way of halogen bridging. Triphenyllead chloride in benzene or in cyclohexane solution shows an isotopic splitting of the Pb-Clstretching mode of ~6 cm-1. © 1969, American Chemical Society. All rights reserved.