This is a copy of the slides presented at the meeting but not formally written up for the volume.

Presented is the initial photophysical investigation of a series of transition metals complexed with an organic, two photon absorbing chromophore. This system is capable of a dual-mode nonlinear response. Upon two photon excitation, rapid intersystem crossing generates a long-lived and strongly absorbing triplet excited state capable of further nonlinear absorption via a reverse saturable absorption pathway.