The photochemical and photophysical properties of a polymer containing nearly 200 pendant groups Re(CO) 3 (1,10-phenanthroline) + bonded to poly-(vynilpyridine) 600 and the related monomer pyRe(CO) 3 (1,10-phenanthroline) + were investigated in solution phase. The yield of formation and the kinetics of decay of the MLCT excited state were found to be dependent on medium and laser power. MLCT excited states in the polymer undergo a more efficient annihilation and/or secondary photolysis than in the monomer. In the polymer, redox quenching of MLCT excited states by methyl viologen and by 2,2‘,2‘ ‘-nitrilotriethanol revealed the presence of intrastrand electron-transfer processes. These processes exhibited a complex kinetics. Mechanisms of the excited-state annihilation and electron-transfer processes in the polymer are proposed.
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Wolcan et al. (2000) studied this question.
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