Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes.

ABSTRACT: The picosecond excited state dynamics of [Ru(tpm)(bpy)(NCS)]⁺ (RubNCS⁺ ) and [Ru(tpm)(bpy)(CN)]⁺ (RubCN⁺ ) (tpm = tris(1-pyrazolyl)methane, bpy = 2,2'-bipyridine) have been analyzed by means of transient absorption measurements and spectroelectrochemistry. Emissive ³MLCTs with (GS)HOMO(h⁺)-(GS)LUMO(e^-) configurations are the lowest triplet excited states regardless of whether 387 or 505 nm photoexcitation is used. 387 nm photoexcitation yields, after a few picoseconds, the emissive ³MLCTs. In contrast, 505 nm photoexcitation populates an intermediate excited state that we assign as a ³MLCT state, in which the hole sits in a metal-centered orbital of different symmetry, prior to

SUBMITTER: Cadranel A 

PROVIDER: S-EPMC5674176 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature