The polarized infrared spectra of single crystals of diborane as well as the spectra of the vapor and liquid are presented and analyzed. Evidence for the existence of three solid phases is discussed and the structure of the lowhyphen;temperature form partially elucidated. This phase is found to be monoclinic with two or more molecules per primitive unit cell located on sites of symmetry no higher thanCi. Confirmatory evidence for Lord and Nielsen's assignment of ngr;9ap;950 cmminus;1and Smith and Mills' assignment of ngr;7ap;850 cmminus;1is presented. It is suggested that the strong electronic absorptions in the nothyphen;toohyphen;far ultraviolet are ofB1usymmetry. Some indication of a special interaction in the solid state is found.
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