期刊
DYES AND PIGMENTS
卷 147, 期 -, 页码 291-299出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.08.024
关键词
Optical power limiting; Aggregation induced emission; Photophysics; Pt(II) diimine complex; Bodipy; Triplet excited state
资金
- National Natural Science Foundation of China [21602106]
- Natural Science Foundation of Jiangsu Province-Outstanding Youth Foundation [BK20170104]
- Industry-Academy-Research Prospective joint project of Jiangsu Province [BY2016005-06]
- National Key Research and Development Program of China [2016YFB0301703]
A series of Pt(II) complexes bearing difluoro-boron-dipyrromethene (Bodipy) acetylide ligands and different alkyl/aryl substituted 2,2'-bipyridyl ligands (Pt-1 - Pt-3) were synthesized and characterized. Their photophysics, aggregation included emission (AIE) and optical power limiting properties were systematically investigated via UV-Vis absorption, emission, transient absorption, and nonlinear transmission spectroscopy/technique. These complexes exhibit (1)pi-pi* transitions/metal-to-ligand charge transfer ((MLCT)-M-1) absorption bands in UV-Vis spectral region and green fluorescence assigned to (1)pi-pi* state mixed with (MLCT)-M-1 character. All complexes exhibit obvious AIE in CH3CN-water solution system. When water fraction increased, nanoparticles of Pt(II) complexes were formed owing to the aggregation, and the emission intensity and triplet excited state lifetime both increased. In addition, complexes Pt-1 - Pt-3 all exhibit triplet transient absorption (TA) in visible region, where reverse saturable absorption (RSA) could occur. The strength of RSA at 532 nm follows the trend: Pt-2 > Pt-3 > Pt-1. The significant AIE, TA and OPL properties of these complexes would be useful for rational design of transition-metal complexes with high emission quantum yield, broadband excited-state absorption, long excited-state lifetime, and strong nonlinear absorption for multi-functional applications. (C) 2017 Elsevier Ltd. All rights reserved.
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