Coexistence of MLCT Excited States of Different Symmetry upon Photoexcitation of a Single Molecular Species

Abstract

Photoexcitation of [Ru(tpy)(bpy)(μ-CN)Ru(py)4Cl]2+ ([RuRu]2+) at 387 nm results in the population of two 3MLCT excited states of different symmetry that coexist on the nanosecond scale. Common to both states is an excited electron in a tpy-based orbital. Their configuration differs in the position of the hole. In one excited state, 3MLCTz, the hole sits in an orbital parallel to the intermetallic axis allowing for a strong metal–metal electronic interaction. As a result, 3MLCTz is highly delocalized over both metal centers and shows an intense photoinduced intervalence charge transfer (PIIVCT) NIR signature. In the other excited state, 3MLCTxy, the hole is localized in an orbital perpendicular to the intermetallic axis and hence, significant intermetallic coupling is absent. This state shows no PIIVCT in the NIR and its spectrum is very similar to the one observed for the monometallic [Ru(tpy)(bpy)(CN)]+ reference. Both 3MLCT excited states have nanosecond lifetimes. The intervening energy barrier for a h...