Di-orthometallated triphenyl phosphite iridium complex as a ‘turn-on’ phosphorescent chemodosimeter probe for silver ions

• Published in: Inorganic chemistry communications 2018-12, Vol.98, p.62-67
• Main Authors: Mei, Qunying, Shu, Jun, Zhou, Shixiong, Zhou, Huidong, Tong, Bihai, Wang, Song
• Format: Article
• Language: English
• Subjects: Chemodosimeter; Crystal structure; Cyclometalated iridium(III) complex; Phosphite; Photoluminescence; Silver(I) ions
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2018.10.003

A di-orthometallated triphenyl phosphite iridium complex Ir(dttpit)(phen)Cl (dttpitH2 = tris (2, 4-di-tert-butylphenyl) phosphite, phen = phenanthroline), has been synthesied and characterized. The crystal structure was determined by X-ray crystallography. The photoluminescence spectrum of Ir(dttpit)(phen)Cl in CH3CN shows emission maximum at 528 nm. In 0.01 wt% PMMA films, its quantum yields and lifetime are 0.16 and 1.78 μs, respectively. The emission of Ir(dttpit)(phen)Cl at 528 exhibits 1393% enhance upon addition of Ag+ in CH3CN/H20. The ratio of Ir(dttpit)(phen)Cl responding to Ag+ is 1:1, and the limit of detection is 0.13 μM. Ir(dttpit)(phen)Cl is a highly selective chemosensor for Ag+ over other metal ions. The interaction between the chlorine atom and Ag+ is responsible for the highly selective and sensitive phosphorescent senor for Ag+. A di-orthometallated triphenyl phosphite iridium complex Ir(dttpit)(phen)Cl has been synthesized and fully characterized. The phosphorescence behaviour of Ir(dttpit)(phen)Cl toward different metal cations have also be studied which indicating a strong phosphorescence enhance by Ag+. The interaction ratio with Ag+ is 1:1. [Display omitted] •An iridium complex with di-orthometallated triphenyl phosphite has been synthesized.•Ir(dttpit)(phen)Cl is a ‘turn-on’ phosphorescent chemodosimeter probe for Ag+.•The detection mechanism has been proved.