Abstract
Infrared spectra of thiourea and its adducts were determined in the region between 4000 and 400cm-1 with a high resolution spectrophotometer. The spectra of adducts were almost similar. Through an investigation with polarized light on orientated thin crystals of adducts, nearly all fundamental bands were assigned. The assignments were also performed to the absorption bands of deuterated thiourea and its inclusion compound with decaline.
The results were examined with the product rule, the agreement being fairly good. Considerable changes were observed in NH stretching vibrations and wagging one, which showed strengthening of the intermolecular hydrogen bonds. The energy gain owing to this change would stabilize the adduct crystal.
