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Photoluminescence of a new water‐insoluble polysiloxane film containing pendant Ru(bpy) 3 2+ and its quenching by dioxygen
Author(s) -
Nagai Keiji,
Takamiya Nobuo,
Kaneko Masao
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970930
Subject(s) - quenching (fluorescence) , photoluminescence , chemistry , solubility , exponential decay , kinetics , photochemistry , molecule , luminescence , polymer chemistry , fluorescence , analytical chemistry (journal) , materials science , organic chemistry , physics , optics , optoelectronics , quantum mechanics , nuclear physics
A new water‐insoluble polysiloxane containing pendant Ru(bpy) 3 2+(bpy = 2,2′‐bipyridine) was studied with respect to the photoluminescence and its quenching by dioxygen. The emission was quenched by O 2 in water more efficiently than in gas phase, and the Stern‐Volmer plots showed a downward deviating curve. To determine which of several quenching models can be applied to the present system, the emission decays under various O 2 concentration were measured, and analyzed by a double exponential decay. From the simulations of the decay using the kinetic parameters obtained from the model analysis, it has been concluded that the quenching by O 2 is caused by static quenching (model 4). The O 2 concentration in the film in contact with water estimated from the quenching parameters was much higher than the solubility of O 2 estimated from the solubility coefficient in a dry film. These results suggest specific affinity of the polysiloxane for O 2 molecule in water.