Infrared Study of Some Organophosphorus Esters in Carbon Tetrachloride and/or Chloroform 1% Solutions

Solvent systems such as CHCl 3 /CCl 4 or CDCl 3 /CCl 4 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 3 /CCl 4 or CDCl 3 /CCl 4 increases.