Synthesis, Characterization, and Evaluation of [Ir(ppy)2(vpy)Cl] as a Polymer-Bound Oxygen Sensor

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• 作者：Maria C. DeRosa ; Peter J. Mosher ; Glenn P. A. Yap ; K.-S. Focsaneanu ; Robert J. Crutchley ; and Christopher E. B. Evans
• 刊名：Inorganic Chemistry
• 出版年：2003
• 出版时间：August 11, 2003
• 年：2003
• 卷：42
• 期：16
• 页码：4864 - 4872
• 全文大小：140K
• 年卷期：v.42,no.16(August 11, 2003)
• ISSN：1520-510X

文摘

This study reports new luminescent oxygen sensors in which the luminophore is covalently bound to the polymermatrix and compares their behavior to related sensors in which the luminophore is dispersed within the matrix. Thecyclometalated iridium complex [Ir(ppy)₂(vpy)Cl], 1, has been synthesized and characterized spectroscopically(absorption and emission) and by 1-D and 2-D ¹H NMR, elemental analysis, and X-ray crystallography. Complex1 was attached via hydrosilation to hydride-terminated poly(dimethylsiloxane) (PDMS), yielding material 2. Successfulluminophore attachment was determined spectroscopically from the emission properties, and through the alteredphysical behavior of 2 compared to a dispersion of 1 in PDMS. Hydrosilation of 1 with dimethylphenylsilane yielded[Ir(ppy)₂(DMPSEpy)Cl], 3, which was fully characterized and used to probe the effect of hydrosilation on thespectroscopic properties of the luminophore. Evaluation of 2 as a luminescent oxygen sensor revealed significantlyimproved sensitivity over dispersions of 1 in PDMS. Material 2 was also blended with polystyrene (PS) to improvethe physical properties of the sensor films. The blend sensors exhibited increased sensitivity relative to films of 2alone and maintained short response times to rapid changes in air pressure. In contrast, 1 partitioned into the PSphase when dispersed in a PDMS/PS blend, resulting in longer sensor response times.