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      Self-Assembled Fluorescent Pt(II) Metallacycles as Artificial Light-Harvesting Systems

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          Abstract

          Light-harvesting is one of the key steps in photosynthesis, while, 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 characteristics (AIEE) in a DMSO-H 2 O solvent system. In the presence of a 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.

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          Author and article information

          Journal
          Journal of the American Chemical Society
          J. Am. Chem. Soc.
          American Chemical Society (ACS)
          0002-7863
          1520-5126
          September 06 2019
          September 06 2019
          Affiliations
          [1 ]Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake City, Utah 84112, United States
          [2 ]Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
          [3 ]Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
          [4 ]Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, United States
          [5 ]College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
          Article
          10.1021/jacs.9b08403
          6988835
          31479260
          © 2019
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