Photoinduced electron transfer and/or energy transfer in molecular assemblies combining ruthenium(II) polypyridine complexes, as donor components, and fullerene-type acceptors have been extensively studied, and their electrochemical and photophysical properties are of particular interest.A series of Ru(II) bisterpyridine C60 dyads linked via para-phenyleneethynylene units of different lengths have been prepared. The functionalization on the fullerene sphere was accomplished via 1,3 cycloaddition reaction to form pyrrolidine and cyclopropane rings. The photophysical properties have been investigated by steady-state as well as time-resolved spectroscopy. Upon light excitation of the Ru(II) center, the emission was strongly quenched by the fullerene. Transient absorption spectroscopy revealed characteristic absorption changes that have been ascribed to the fast decay of the Ru(II)-based 3MLCT transition and formation of the lowest excited C60 triplet state. Nanosecond flash photolysis allowed to determine the decay (t1/2 = 1 �s) of the latter one towards the ground state.

Ruthenium(II) terpyridyl-fullerene assemblies: Synthesis, electrochemical, and photophysical properties

248th National Meeting (2014)

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