The disproportionation of diselenium dichloride, Se2Cl2, and diselenium dibromide, Se2Br2

Abstract

Diselenium dichloride and dibromide have been shown by Raman and 77Se-nmr spectroscopy to be equilibrium mixtures of Se2X2 and small amounts of SeX2 and SenX2. Equilibrium constants have been estimated for the disproportionation reactions,[Formula: see text]The origin of "spurious" peaks in the reported vibrational spectra of Se2Br2 and Se2Cl2, which have been variously assigned to overtone and combination bands and impurities has been clarified. Mixtures of Se2Br2 and Se2Cl2 are shown to contain Se2BrCl in equilibrium according to[Formula: see text]Keywords: 77Se nmr, Raman spectroscopy, selenium halides, diselenium dichloride, diselenium dibromide.