Self-Assembled Fluorescent Pt(II) Metallacycles as Artificial Light-Harvesting Systems
Self-Assembled Fluorescent Pt(II) Metallacycles as Artificial Light-Harvesting Systems
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DOI：
10.1021/jacs.9b08403
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发表时间：
2019-09-18
影响因子：
15
通讯作者：
Stang, Peter J.
中科院分区：
文献类型：
--
作者：
Acharyya, Koushik;Bhattacharyya, Soumalya;Stang, Peter J.
光捕获是光合作用的关键步骤之一，但开发具有高能量传递效率的人工光捕获系统（LHS）一直是一项具有挑战性的任务。在这里，我们报告荧光六角Pt（II）金属杂环作为一个新的平台，制造人工LHS。金属杂环（4和5）是很容易获得的协调驱动的自组装的三苯胺为基础的ditopic配体1与双铂受体2和3，分别。它们在溶液和固体状态下都具有良好的荧光性质。值得注意的是，金属杂环化合物在DMSO-H2O溶剂体系中显示聚集诱导发射增强（AIEE）特性。在荧光染料曙红Y（ESY）的存在下，金属杂环的发射强度降低，但ESY的发射强度增加。ESY的吸收光谱和金属杂环的发射光谱有相当大的重叠，表明能量从金属杂环转移到ESY的可能性，在4（a）+ESY体系中能量转移效率高达65%。
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 (4 and 5) are easily accessible by coordination-driven self-assembly of a triphenylamine-based ditopic ligand 1 with di-platinum acceptors 2 and 3, 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-H2O 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 4(a)+ESY system.