A Single‐Anion‐Based Red‐Emitting Cationic Diiridium(III) Complex Bearing a Pyrimidine‐Based Bridging Ligand for Oxygen Sensing. Issue 9 (2nd March 2018)

• Record Type: Journal Article
• Authors: Shi, Chao; Li, Qiuxia; Zou, Liang; Lv, Zhuang; Yuan, Aihua; Zhao, Qiang
• Is Part Of: European journal of inorganic chemistry. Issue 9(2018)
• Page Start: 1131
• Page End: 1136
• Publication Date: 2018-03-02
• Subjects: Luminescence -- N ligands -- Iridium -- Sensors -- Bridging ligands -- Oxygen; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201800004
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : Compared with double‐anion‐based cationic diiridium complexes, the study of single‐anion‐based cationic diiridium complexes as emitters is largely unexplored. In this work, two methods were used to prepare single‐anion‐based cationic diiridium complexIr‐Ir‐1 bearing 2‐pyrimidine‐benzimidazole as bridging ligand, both sides of which are symmetrical structures comprising 2‐phenylpyridine as cyclometalated ligand. It shows efficient red phosphorescence emission with redshift of the emission wavelength by 85 nm relative to the corresponding monoiridium complexIr‐1 . Moreover, it exhibits long emission lifetime and high oxygen sensitivity, which were attributed to the intraligand charge‐transfer excited state. Hence, Ir‐Ir‐1 was used as a oxygen probe to monitor intracellular O2 content by time‐resolved luminescence imaging. Abstract : A single‐anion‐based, red‐emitting, cationic diiridium complex was synthesized, and it exhibits long phosphorescence lifetime, high emission efficiency, and high oxygen sensitivity. Additionally, it was successfully used to monitor intracellular O2 levels by means of both emission intensity and phosphorescence lifetime.