Although introducing PEG groups to these molecules increased the number of interaction sites with CO2, solvents (1) -(3) showed poorer CO2 absorption than TBP and T i BP due to decreased solvent FFV. Computational studies of the analogous organophosphate solvents were performed, calculating partial negative charges as well as CO2 interaction energies and distances for all O atoms located in these solvents. All five molecules had the lowest partial negative charges, closest CO2 interaction, and largest CO2 interaction energy at the phosphoryl O atom. The addition of etheric groups to TBP fails to improve CO2 absorption because the additional ether groups have CO2 interactions which are much smaller than with the phosphoryl group. The solvent FFV were computed and was found to be largest for T i BP and grew progressively smaller as the length of the PEG group grew longer in solvents (1) -(3). It was concluded that FFV was the dominant factor for determining CO2 absorption ability in organophosphate solvents.