Synthesis, structure, and photophysical properties of a bis-cyclometalated heteroleptic iridium(III) complex containing 2,2′-dipyridylamine
摘要:
The synthesis, X-ray crystal structure and luminescence properties of a new bis-cyclometalated heteroleptic complex, [Ir(ppy)(2)(HD-PA)]PF6) (1, ppy = 2-phenylpyridine, HDPA = 2,2'-dipyridylamine), are reported. Both at room temperature and 77 K, complex 1 exhibits intense blue emission, assigned as (MLCT)-M-3 [d pi(Ir)pi*(HDPA)] phosphorescence. Analysis of voltammetric data also provides evidence in support of this assignment. (c) 2006 Elsevier B.V. All rights reserved.
Two new blue-phosphorescent Ir(III) cyclometalated complexes demonstrating the pushing-up effects of amino on levels of Pi-type molecular orbitals
作者:Wei-Ting Chen、Yi-Jing Chen、Chun-Sheng Wu、Jin-Ju Lin、Wei-Lin Su、Shu-Hui Chen、Shao-Pin Wang
DOI:10.1016/j.ica.2013.06.021
日期:2013.11
Orbital interactions between nitrogen's 2p-orbital, 2p(N), and the higher-lying HOMO/ LUMO would push-up the latter even higher. This destabilization effect exerted by an amino explains the high-lying LUMO of the 2,2'-dipyridyl amine (HDPA) ancillary ligand, as well as the high-lying LUMO in Ir(ppy)(2)HDPA(+) (ppy = 2-phenylpyridine). The pi-destabilization effect on MOs exerted by a fluoro must be incorporated into consideration to explain the site-dependent characteristics observed by related color-tuning studies. Two new blue phosphorescent fluorinated Ir(ppy)(2)HDPA(+) complexes have been synthesized by introducing fluoro(s) at suitable phenyl-carbon(s): having small 2p(pi)(C) content in HOMO and/ or large 2p(pi)(C) content in LUMO. (C) 2013 Elsevier B.V. All rights reserved.