NMR study of the interaction between water and tributyl phosphate in the TBP-CCl4-H2O system

Hydrogen bonding between water and tributyl phosphate （TBP） in TBP-CCl-HOsystem has been studied byH NMR.A new model and an empirical equation have been establishedon the basis of Li’s model and the parameters of hydrogen bond between water and TBP are deter-mined by nonlinear optimization method.In TBP-CCl-HO system change ofH chemicalshift of water can be satisfactorily explained by the new model and the empirical equation in thewhole concentration range.When the concentration of water in the organic phase is very low,themain existing forms of water are HO·TBP and HO·2TBP.When the concentration of waterreaches saturation,the main existing form is associated water,but there are still about 20% ofwater existing in the forms of HO·TBP and HO·2TBP.