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Ultrafast Excited State Dynamics of Tris-(2,2’-Bipyridine) Ruthenium(II) by Alvin Tien-Wei Yeh Doctor of Philosophy in Chemistry University of Californi~ Berkeley Professor Charles V. Shank, Chair Time resolved anisotropy measurements and time dependent transient absorption measurements are used to study the evolution of the photoexcited Franck-Condon state to the formation of the long-lived triplet metal-to-ligand charge-transfer (3MLCT) state in tris-(2,2’-bipyridine) ruthenium. [Ru(bpy)3]2+ represents a large class of inorganic compounds with interesting and potentially applicable photophysical properties. These compounds have generated much interest in the inorganic chemistry community because their photophysical properties are easily manipulated by synthetic chemistry methods. However, little remains known about the processes which govern the evolution horn initial photoexcitation to the formation of the long-lived excited state. Metal to ligand charge transfer, when used to describe inorganic compounds, is a description of how the compound reacts to the absorption of light. Typically, these inorganic compounds are made of a transition metal with organic ligands, consisting of carbon, nitrogen and oxygen, coordinated in a highly symmetrical manner to the metal center. The highest occupied molecular orbitals (HOMO) in these compounds are isoenergetic with the frontier atomic orbitals of the metal and are localized to the metal

Ultrafast excited state dynamics of tris-(2,2'-bipyridine) Ruthenium (II)