Literature data of the 0-0 transition energy nu(max) of the collision induced 1 Delta(g) phosphorescence of O-2 in solution are analyzed. It is shown that the solvent shift of nu(max) is composed additively of a red-shift, caused by dispersive interactions between the solvent in the surrounding of the colliders O-2((1) Delta(g)) and solvent molecule, and a blue-shift which is due to the inherent collision induced nature of the (1) Delta(g) --> (3) Sigma(g)(-) transition and due to changes in the repulsive part of the effective intermolecular potential in the condensed phase with electronic excitation.