Tetraphenylethene-Based Emissive Pt(II) Coordination Polymer toward Artificial Light-Harvesting Systems with Sequential Energy Transfer

Ahmed, S and Kumar, A and Mukherjee, PS (2022) Tetraphenylethene-Based Emissive Pt(II) Coordination Polymer toward Artificial Light-Harvesting Systems with Sequential Energy Transfer. In: Chemistry of Materials .

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Abstract

Supramolecular systems with sequential energy transfer have prospects in designing artificial light-harvesting systems (LHSs), which can mimic natural photosynthesis process. Here, we report a facile synthesis of a supramolecular coordination polymer (SCP) P as an emissive material through two-component coordination-driven self-assembly of a tetra-imidazole donor (L) containing tetraphenylethene backbone with a 180° trans-Pt(PEt3)2(OTf)2 acceptor. P shows considerable enhancement in its emission in 90% water-DMSO mixture as it further self-assembles into spherical nanoaggregates. In addition, because of the framework structure of P with hydrophobic cavities and the interspaces present in the nanoaggregates of P, it can act as a suitable host to adsorb organic dyes. Therefore, polymeric material P in the nanoaggregate form in aqueous-DMSO medium was used as an efficient platform to fabricate two highly efficient light-harvesting materials with rare two-step cascade energy-transfer process. For the first-step energy-transfer process, P acts as an efficient energy donor by the Förster resonance energy-transfer (FRET) process to Eosin Y (EY) and Fluorescein (Fl) with high energy-transfer efficiency (58.8% for P-EY and 67.9% for P-Fl), good antenna effect (7.2 for P-EY, 5.2 for P-Fl), and increased quantum yield. Moreover, NiR (Nile Red) was used as a second acceptor to construct efficient two-step artificial light-harvesting materials (P-EY-NiR and P-Fl-NiR), which exhibit high FRET efficiencies of 68.5 and 76.2% as well as good antenna effect of 10.9 and 17.7, respectively. These light-harvesting materials represent the new examples of artificial LHSs based on nanoaggregates of an SCP with sequential two-step energy transfer in aqueous medium. Notably, emission/visual color changes from blue to yellow to pink for P-EY-NiR and blue to green to pink for P-Fl-NiR and cover the entire visible range spectrum.

Item Type:	Journal Article
Publication:	Chemistry of Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Antennas; Artificial photosynthesis; Forster resonance energy transfer; Harvesting; Hydrophobicity; Infrared devices; Platinum compounds; Supramolecular chemistry, Artificial light harvesting; Energy transfer process; Energy-transfer; Eosin Y; Light-harvesting; Light-harvesting systems; Nanoaggregates; Nile red; Supramolecular coordination polymers; Tetraphenylethene, Energy transfer
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	15 Nov 2022 06:20
Last Modified:	15 Nov 2022 06:20
URI:	https://eprints.iisc.ac.in/id/eprint/77920

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