Structure-property relationships in a new series of two-photon absorbing D-π-D divinyl-biphenyl derivatives

Two-photon absorption cross-sections of divinyl-biphenyl derivatives molecules can be enlarged by the increasement of their charge transfer dipoles with the substitution of their terminal donor groups, but it also has a limit that as the dipole larger than a value the symmetrical π-system will rotate around the center single bond.