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论文类型：期刊论文

发表时间：2020-02-01

发表刊物：SENSORS AND ACTUATORS B-CHEMICAL

收录刊物：EI、SCIE

卷号：304

关键字：Cyclometalated Pt(II) complexes; Oxygen sensing; Substituent effect; Photostability; Fluorine

摘要：Fluorinated cyclometalated Pt(II) complexes Pt(Fppy)(acac) and Pt(dFppy)(acac), phenyl-substituted LA1, and 2,4-difluorophenyl-substituted LA2 were synthesized and applied as phosphorescent probes for monitoring of molecular oxygen compared with a model complex Pt(ppy)(acac). The phosphorescence of all Pt(II) complexes in tetrahydrofuran (THF) or immobilized in ethyl cellulose (EC) films was gradually quenched with the increase of the oxygen concentration. The intensity ratio I-0/I-9.61 and I-0/I-100 were used to evaluate oxygen sensitivities of the Pt(II) complexes in THF and in EC film, respectively. LA1 demonstrates the highest oxygen sensitivity with I-0/I-9.61 of 19.5 in THF, and I-0/I-100 of 13.5 and a K-SV(app) of 16.9 bar(-1) in EC film. The photostability tests of the Pt(II) complexes immobilized EC films show that, phenyl and fluorine substituents have a synergistic effect on improving the photostability of the complexes. The LA2-immobilized EC film demonstrates the highest photostability and excellent operational stability (3.8 s on going from 100% N-2 to 100% O-2 and 4.5 s on going from 100% O-2 to 100% N-2), which is a potential photostable probe for online monitoring of molecular oxygen.