Abstract
Complexes between various nitriles and ICl have been studied in solution by infrared spectroscopic methods. The bond is directed from the nitrogen to the iodine atom and is probably of the charge transfer type. The infrared data indicate that in the case of acetonitrile the halogen molecule is situated on the three-fold symmetry axis. Formation constants ( K c ) of these 1:1 complexes in carbon tetrachloride at 28°C were obtained from intensity changes of the CN stretching bands. The donor strength of the nitriles R-CN is dependent upon the inductive effects of the substituent R. In the complexes the CN stretching bands had higher frequencies ( v), higher integrated intensities ( B) and generally larger half intensity widths (ν 1 2 ) than those of the free nitriles. Spectral parameters for these bands are given.
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