P222
The Photophysical Properties of Novel Ruthenium(II) Bipyridyl-Nickel(II) Schiff Base Binuclear Complexes
P. Wang, K. Kasuga, N. Komatsuzaki, Y. Himeda, S. Murata, H. Sugihara, H. Arakawa
NIMC
The spectroscopic and photophysical properties of binuclear ruthenium(II) -nickel(II) complexes in which ruthenium(II) poly(bipyridine) complex and nickel(II) complex are covalently linked were investigated in this work. Rusults indicate that a strong disturbance of excited ruthenium(II) complex was found in the excited states of binuclear complexes. Emission quantum yields decrease by 10-20 times, and lifetimes of emission change from about 800ns to 30-40ns by comparision with those for ruthenium(II) mononuclear complex. Results also show that the excited-state oxidation mechanism is unfavorable, but the excited-state reduction mechanism is feasible thermodynamically in ruthenium(II)-nickel(II) binuclear complexes. Furthermore, triplet-triplet intramolecular energy transfer may occur from the excited ruthenium(II) complex to the ground state of nickel(II) complex in these binuclear complexes. The present results suggest that the emission quenching of ruthenium !
complex in binuclear complex may result from both intramolecular energy transfer and electron transfer.
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