Abstract
The nature of the lowest excited states of a series of osmium(II) porphyrins has been investigated using static and time-resolved emission spectroscopy and ultrafast transient absorption measurements. It is found that a metal-to-ring 3 (d,π * ) charge transfer excited state is the lowest excited state of the Os II P(CO)(L) and Os II P(L) 2 complexes, where the porphyrin macrocycle (P) is either tetratolyl- or octaethylporphyrin and the axial ligand L is a σ-donor such as pyridine. Previous studies on OsTTP(CO)(py) had led to the assignment of the lowest excited state as the 3 (π,π * ) state of the porphyrin ring
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