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

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

Maria C DeRosa, Peter J Mosher, Glenn P A Yap, K-S Focsaneanu, Robert J Crutchley, Christopher E B Evans

Inorg Chem. 2003 Aug 11;42(16):4864-72.

PMID: 12895108

Abstract:

This study reports new luminescent oxygen sensors in which the luminophore is covalently bound to the polymer matrix and compares their behavior to related sensors in which the luminophore is dispersed within the matrix. The cyclometalated iridium complex [Ir(ppy)(2)(vpy)Cl], 1, has been synthesized and characterized spectroscopically (absorption and emission) and by 1-D and 2-D (1)H NMR, elemental analysis, and X-ray crystallography. Complex 1 was attached via hydrosilation to hydride-terminated poly(dimethylsiloxane) (PDMS), yielding material 2. Successful luminophore attachment was determined spectroscopically from the emission properties, and through the altered physical 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 the spectroscopic properties of the luminophore. Evaluation of 2 as a luminescent oxygen sensor revealed significantly improved sensitivity over dispersions of 1 in PDMS. Material 2 was also blended with polystyrene (PS) to improve the physical properties of the sensor films. The blend sensors exhibited increased sensitivity relative to films of 2 alone and maintained short response times to rapid changes in air pressure. In contrast, 1 partitioned into the PS phase when dispersed in a PDMS/PS blend, resulting in longer sensor response times.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP70900219	Poly(dimethylsiloxane), hydride terminated		70900-21-9	Price

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