Abstract

The present study has shown that some normal vibrations shift to lower frequency while others shift to higher frequency as the mole % of the solvent system increases. The <i>v</i>P=O mode for compounds containing the P(=O)Cl₂ group shifts to lower frequency with increase in the mole % CHCl₃/CCl_4. The P=O group is believed to be complexed with the solvent system. Both the <i>v</i>_asym.PCl₂ and <i>v</i>_sym. PCl₂ modes shift to higher frequency as the mole % CHCl₃/CCl₄ increases. The application of IR and different solvent systems aids in assigning rotational isomer band pairs.

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