Abstract
Abstract The infrared spectra of addition compounds of cyanogen halides (ClCN, BrCN) with inorganic halides (SbCl 5 , TiCl 4 , AlCl 3 , AlBr 3 ) have been measured in the region from 4000 to 250 cm −1 . The displacement of bands by the formation of a co-ordination bond and the appearance of metal-to-nitrogen stretching vibrations indicate the acceptance of a lone pair of electrons from the nitrogen atom of cyanogen halides in virtue of Lewis acid. The bands observed in the addition compounds of cyanogen halides (ClCN, BrCN) with SbCl 5 have been assigned on the basis of C 4 v symmetry, and those with TiCl 4 of D 4h symmetry. The bands observed in the addition compounds of ClCN with AlCl 3 and of BrCN with AlBr 3 have been assigned on the basis of C 3 v symmetry. The displacement of CN stretching frequency has also been studied for the addition compounds of ClCN with inorganic halides (AlCl 3 , TiCl 4 ) in the solution of SOCl 2 or POCl 3 .
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