Abstract
Solvent systems such as CHCl<sub>3</sub>/CCl<sub>4</sub> or CDCl<sub>3</sub>/CCl<sub>4</sub> are useful in showing that organophosphorus esters do exist as rotational isomers in solution. The functional groups such as P=O and POR in organophosphorus esters are the sites of solute/solvent interaction, since their group frequencies are more affected than group frequencies arising primarily within the R group of the organophosphorus esters. This study also shows that different complexes are formed between the solute and solvent systems as well as within the solvent system as the mole % CHCl<sub>3</sub>/CCl<sub>4</sub> or CDCl<sub>3</sub>/CCl<sub>4</sub> increases.
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