Tailoring Oxygen Sensitivity with Halide Substitution in Difluoroboron Dibenzoylmethane Polylactide Materials

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• 作者：Christopher A. DeRosa ; Caroline Kerr ; Ziyi Fan ; Milena Kolpaczynska ; Alexander S. Mathew ; Ruffin E. Evans ; Guoqing Zhang ; Cassandra L. Fraser
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 28, 2015
• 年：2015
• 卷：7
• 期：42
• 页码：23633-23643
• 全文大小：471K
• ISSN：1944-8252

文摘

The dual-emissive properties of solid-state difluoroboron 尾-diketonate-poly(lactic acid) (BF₂bdkPLA) materials have been utilized for biological oxygen sensing. In this work, BF₂dbm(X)PLA materials were synthesized, where X = H, F, Cl, Br, and I. The effects of changing the halide substituent and PLA polymer chain length on the optical properties in dilute CH₂Cl₂ solutions and solid-state polymer films were studied. These luminescent materials show fluorescence, phosphorescence, and lifetime tunability on the basis of molecular weight, as well as lifetime modulation via the halide substituent. Short BF₂dbm(Br)PLA (6.0 kDa) and both short and long BF₂dbm(I)PLA polymers (6.0 or 20.3 kDa) have fluorescence and intense phosphorescence ideal for ratiometric oxygen sensing. The lighter halide-dye polymers with hydrogen, fluorine, and chlorine substitution have longer phosphorescence lifetimes and can be utilized as ultrasensitive oxygen sensors. Photostability was also analyzed for the polymer films.