119th General Meeting of the KCS

Type Poster Presentation
Area 무기화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code INOR.P-62
Subject Synthesis and Photophysical Properties of Iridium(III) Cyclometalates with 1,2-Dihydronaphthyl-Containing C^N Ligands
Authors KUMAR AJAY, NGUYEN VAN NGHIA, 박재영, 이민형*
울산대학교 화학과, Korea
Abstract Novel Ir(III) cyclometalates, (dnpz)2Ir(acac) (1c), (dnpy)2Ir(acac) (2c), and fac-Ir(dnpy)3 (2d) (dnpz = 1-(1,2-dihydronaphthalen-4-yl)pyrazole; dnpy = 2-(1,2-dihydronaphthalen-4-yl)pyridine) based on 1,2-dihydronaphthyl-containing C^N Ligands were synthesized and characterized. X-ray diffraction study on 2d revealed facial arrangement of three dnpy ligand around the Ir center. PL spectra of 1c and 2c―2d exhibited yellow to orange emission centered at 539―590 nm, which was red-shifted compared to that (λem = 508 nm) of fac-Ir(ppy)3 (3). While tris-complex 2d showed high quantum efficiency (Φ = 0.57), heteroleptic complexes 1c and 2c were poorly emissive in toluene (Φ = 0.008 and 0.11). In contrast, PLQYs of the film samples of 1c and 2c were much increased (Φ = 0.05 and 0.21). Cyclic voltammetry measurements indicated that the 1,2-dihydronaphthy moiety increased metal-centered HOMO level, while it stabilized LUMO level due to conjugation with N-heterocyclic fragments. Details of synthesis, characterization, and photophysical properties of complexes will be discussed.
E-mail ajaychem14@gmail.com