Department of Chemistry , University of Utah , 315 South 1400 East, Room 2020 , Salt Lake City , Utah 84112 , United States.
Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore 560012 , India.
J Am Chem Soc. 2019 Sep 18;141(37):14565-14569. doi: 10.1021/jacs.9b08403. Epub 2019 Sep 6.
Light-harvesting is one of the key steps in photosynthesis, but developing artificial light-harvesting systems (LHSs) with high energy transfer efficiencies has been a challenging task. Here we report fluorescent hexagonal Pt(II) metallacycles as a new platform to fabricate artificial LHSs. The metallacycles ( and ) are easily accessible by coordination-driven self-assembly of a triphenylamine-based ditopic ligand with di-platinum acceptors and , respectively. They possess good fluorescence properties both in solution and in the solid state. Notably, the metallacycles show aggregation-induced emission enhancement (AIEE) characteristics in a DMSO-HO solvent system. In the presence of the fluorescent dye Eosin Y (ESY), the emission intensities of the metallacycles decrease but the emission intensity of ESY increases. The absorption spectrum of ESY and the emission spectra of the metallacycles show a considerable overlap, suggesting the possibility of energy transfer from the metallacycles to ESY, with an energy transfer efficiency as high as 65% in the system.
捕光作用是光合作用的关键步骤之一，但开发具有高效能量转移效率的人工捕光系统（LHS）一直是一项具有挑战性的任务。在这里，我们报告了荧光六方 Pt(II) 金属环作为构建人工 LHS 的新平台。金属环（和）可通过基于三苯胺的双齿配体与双铂受体和的配位驱动自组装轻松获得。它们在溶液和固态中均具有良好的荧光性质。值得注意的是，金属环在 DMSO-H2O 溶剂体系中表现出聚集诱导发射增强（AIEE）特性。在荧光染料曙红 Y（ESY）存在下，金属环的发射强度降低，但 ESY 的发射强度增加。ESY 的吸收光谱和金属环的发射光谱有相当大的重叠，表明能量可能从金属环转移到 ESY，在系统中能量转移效率高达 65%。
