Melina Kayoko Itokazu, André Sarto Polo, Neyde Yukie Murakami Iha, "Light driven isomerization of coordinated ligand and modulation of fac- photoluminescence in rigid media", International Journal of Photoenergy, vol. 3, Article ID 623858, 22 pages, 2001. https://doi.org/10.1155/S1110662X01000174
Light driven isomerization of coordinated ligand and modulation of fac- photoluminescence in rigid media
The excited state reactivity and photophysical properties of fac- (phen = 1,10-phenanthroline, L = trans- or cis-1,2-bis(4-pyridyl)ethylene, bpe) in PMMA (poly(methyl methacrylate)) films have been investigated and compared with those in acetonitrile solution.313 or 365 nm irradiation of the rhenium complex in PMMA leads to UV-vis spectral changes due to the isomerization of the coordinated bpe ligand. The fac- product presents a markedly enhanced luminescence due to a lower lying metal-to-ligand charge transfer (MLCT) excited state in the cis isomer. This emitting property can be conveniently applied as a probe or sensor.The cis is omer ratio in the photostationary state (PSS) is substantially smaller in solid films than in solution. The photochemical behavior of the free trans-1,2-bis(4-pyridyl)ethylene in PMMA is also reported to establish comparisons with the investigation carried out in acetonitrile solution as well as with the behavior of the coordinated ligand.
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