TIME-RESOLVED IR STUDY OF THE PHOTOBEHAVIOR OF W(CO)5(4-ACPY) (4-ACPY= 4-ACETYLPYRIDINE)

Fast time-resolved infrared spectroscopy (TRIR) is used to probe the p hotochemistry of W(CO)5(4-acetylpyridine) inn-heptane. Visible irradia tion (510nm) populates the lowest MLCT state, which is monitored by TR IR. Subsequent dissociation to W(CO)5...n-heptane, via equilibrium wit h the 3LF state, is also followed. On UV irradiation (308 nm), the LF state is populated directly and W(CO)5...n-heptane appears immediately . With 510-nm irradiation, the yield of W(CO)5...n-heptane as a functi on of temperature is measured to give a value for the energy pp betwee n the lowest MLCT state and the 3LF state, approximately 4000 cm-1.