%XOO .RUHDQ &KHP 6RF 9RO 1R 'RO.LP DQG (XQ-X 6KLQ Noncovalently Linked Zinc Porphyrin-Ru(bpy)3 Dyad Assembled via Axial Coordination

Noncovalently linked electron donor-acceptor dyad consisting of zinc tetratolylporphyrin and pyridine-appended ruthenium trisbipyridine complex was prepared, via axial coordination of pyridine moiety in ruthenium trisbipyridine complex on zinc tetratolylporphyrin. For the purpose of comparison, axial coordination of pyridine-appended 2,2'-bipyridine on zinc tetratolylporphyrin was also investigated. The K values were determined based on absorption or fluorescence studies. The fluorescence of zinc tetratolylporphyrin was efficiently quenched upon axial coordination of pyridine moiety, probably due to the photoinduced electron transfer from zinc tetratolylporphyrin to ruthenium trisbipyridine, supported by free energy estimation