The infrared spectra of B2O3and HBO2vapors have been rehyphen;examined by means of a longhyphen;path highhyphen;temperature absorption cell. The vibrational spectrum previously assigned to B2O3now appears to be due to HBO2. Since the band near 2000 cmminus;1, indicating the presence of boronmdash;oxygen double bonds, apparently belongs not to B2O3, but to HBO2, a Vhyphen;shaped structure for the B2O3molecule appears unacceptable. The absorption spectrum of B2O3vapor has one broad feature near 1400 cmminus;1which can be correlated with B2O3bands observed in an inert gas matrix. The present spectra and a reanalysis of previously published matrix spectra are shown to be consistent with a bipyramidal B2O3structure of symmetryD3h.
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