Photoluminescence of a new water-insoluble polysiloxane film containing pendant Ru(bpy) and its quenching by dioxygen

✍ Scribed by Keiji Nagai; Nobuo Takamiya; Masao Kaneko

• Book ID: 102940436
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 690 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970930

✦ Synopsis

Abstract

A new water‐insoluble polysiloxane containing pendant Ru(bpy) (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.