赵建章

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教授

博士生导师

硕士生导师

性别:男

毕业院校:吉林大学

学位:博士

所在单位:化工学院

学科:有机化学. 应用化学. 物理化学

办公地点:西部校区E座208房间

联系方式:0411-84986236

电子邮箱:zhaojzh@dlut.edu.cn

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Effect of substituents on properties of diphenylphosphoryl-substituted bis-cyclometalated Ir(III) complexes with a picolinic acid as ancillary ligand

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论文类型:期刊论文

发表时间:2017-10-01

发表刊物:DYES AND PIGMENTS

收录刊物:SCIE、EI、Scopus

卷号:145

页面范围:136-143

ISSN号:0143-7208

关键字:Cyclometalated Ir(III) complex; Diphenylphosphoryl group; Phosphorescence; Oxygen sensing; Photostability

摘要:A series of diphenylphosphoryl-substituted bis-cyclometalated Ir(III) complexes (POFIrpic, 4Me-POFIrpic, 5Me-POFIrpic, 5F-POFIrpic and 5CF(3)-POFIrpic) with a picolinic acid as the ancillary ligand have been synthesized and characterized. The influence of substituents (CH3, F, CF3) at the pyridyl moiety of the cyclometalating ligand POFdFppy (2-(2',4'-difluoro-3'-diphenylphosphoryl)phenylpyridine) on the photophysical and electrochemical properties of these Ir(III) complexes has been investigated. These Ir(III) complexes exhibit intense emission bands at 455-492 nm and high phosphorescence quantum yields (Phi(PL)) in a range of 54-64% in CH2Cl2. The phosphorescence oxygen sensing properties of these complexes were studied in solution and in polymer film, and a fast response time and excellent operational stability were observed. Two-site model fitting indicates that 5Me-POFIrpic is the most sensitive oxygen sensing material among the complexes, with a quenching constant K-sv(app) of 0.00793 Torr(-1). Photodegradation tests demonstrate that introduction of a CF3 group into the cyclometalating ligand improves the photostability of the corresponding Ir(III) complex. (C) 2017 Elsevier Ltd. All rights reserved.