A diphenylamino-substituted cationic cyclometalated Ir(iii) complex: its aggregation-induced phosphorescent emission and oxygen sensing properties. (10th June 2019)

• Record Type: Journal Article
• Authors: Wang, Lei; Gao, Zhanming; Liu, Chun; Jin, Xin
• Is Part Of: Materials chemistry frontiers. Volume 3:Number 8(2019)
• Page Start: 1593
• Page End: 1600
• Publication Date: 2019-06-10
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c9qm00227h
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : A new diphenylamino (DPA)-substituted cationic cyclometalated Ir(iii ) complex, Ir2, demonstrates aggregation-induced phosphorescent emission (AIPE) and exhibits higher sensitivity to O2 in an EC film than non-DPA-modifiedIr1 . Abstract : A cationic cyclometalated Ir(iii ) complex, Ir2, with aggregation-induced phosphorescent emission (AIPE) has been prepared and fully characterized. The effects of the diphenylamino (DPA) group on the photophysical properties, redox properties and oxygen sensing behaviors of the Ir(iii ) complex were investigated systematically, and compared with non-DPA-substituted complexIr1 . The results show that the introduction of an electron-donating DPA group at the 4-position on the phenyl ring of the cyclometalating ligand affects the HOMO levels of the corresponding Ir(III ) complex significantly, resulting in a marked decrease in the energy gap. DPA-substitutedIr2 demonstrates obvious aggregation-induced phosphorescent emission, while non-DPA-substitutedIr1 is AIPE-inert. The phosphorescence oxygen sensing properties of both complexes were studied in polymer films, and fast response time and excellent operational stability were observed. Two-site model fitting results indicate thatIr2 exhibits higher sensitivity to O2 than that ofIr1 . The DPA-substituted cationic cyclometalated Ir(iii ) complex is a potential candidate for efficient luminescent oxygen sensing.