DeRosa Christopher A, Kerr Caroline, Fan Ziyi, Kolpaczynska Milena, Mathew Alexander S, Evans Ruffin E, Zhang Guoqing, Fraser Cassandra L
Department of Chemistry, University of Virginia , Charlottesville, Virginia 22904, United States.
ACS Appl Mater Interfaces. 2015 Oct 28;7(42):23633-43. doi: 10.1021/acsami.5b07126. Epub 2015 Oct 19.
The dual-emissive properties of solid-state difluoroboron β-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.
固态二氟硼β-二酮酸酯-聚乳酸（BF2bdkPLA）材料的双发射特性已被用于生物氧传感。在这项工作中，合成了BF2dbm(X)PLA材料，其中X = H、F、Cl、Br和I。研究了改变卤化物取代基和PLA聚合物链长度对稀CH2Cl2溶液和固态聚合物薄膜光学性质的影响。这些发光材料基于分子量显示出荧光、磷光和寿命可调性，以及通过卤化物取代基进行的寿命调制。短链BF2dbm(Br)PLA（6.0 kDa）以及短链和长链BF2dbm(I)PLA聚合物（6.0或20.3 kDa）具有适用于比率氧传感的荧光和强磷光。具有氢、氟和氯取代的较轻卤化物染料聚合物具有更长的磷光寿命，可作为超灵敏氧传感器。还对聚合物薄膜的光稳定性进行了分析。
