Micelle Assisted Multi-Step Energy Relay in a Blend of Fluorophores as a Potential Light Harvesting System

IF 3 4区化学 Q3 CHEMISTRY, PHYSICAL

ChemPhotoChem Pub Date : 2025-01-16 DOI:10.1002/cptc.202400322

Firdaus Ahmad Ahanger, Ayaz Ahmad Manhas, Umar Nabi Tak, Gousia, Saima Sidiq, Showkat Rashid, Mohd Sajid Lone, Aijaz Ahmad Dar

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Abstract

We report a pH-responsive system comprising three pH responsive fluorophores, 7-Hydroxy coumarin (7HC), Fluorescein (Flu), and Rhodamine B (RhB) wherein an efficient two-step Förster Resonance Energy Transfer (FRET) process is facilitated. Upon excitation of 7HC, energy is sequentially transferred from 7HC (primary donor) to Flu (primary acceptor) and then to RhB (secondary acceptor). The FRET processes were studied at pH 7 and 12 in the presence of surfactants: cationic Tetradecyltrimethylammonium bromide (TTAB), anionic Sodium Dodecyl Sulfate (SDS), and neutral polyoxyethylene[4] lauryl ether (Brij 30). Differences in FRET efficiencies across surfactant media were interpreted by analyzing the solubilization sites of the fluorophores using UV-Visible and fluorescence spectroscopy. The pH-dependence of the FRET acted as an ON-OFF switch, showing higher efficiency in alkaline media. Among the surfactant systems, the two-step FRET operated most efficiently in alkaline TTAB micelles, with efficiencies reaching up to 50 % for 7HC to Flu (FRET-1), 30 % for Flu to RhB (FRET-2), and 23 % for the overall transfer. At a donor-to-acceptor ratio of 1000/80/80, energy transfer efficiencies touched 74 % for FRET-1 and 84 % for FRET-2. This highlights TTAB micelles as promising scaffolds for efficient multi-step FRET-based artificial light-harvesting systems.

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胶束辅助多步能量继电器混合荧光团作为一个潜在的光收集系统

我们报告了一种 pH 响应系统，该系统由三种 pH 响应荧光团组成：7-羟基香豆素（7HC）、荧光素（Flu）和罗丹明 B（RhB）。7HC 受激发后，能量依次从 7HC（主要供体）转移到 Flu（主要受体），然后再转移到 RhB（次要受体）。在 pH 值为 7 和 12 时，研究了存在表面活性剂时的 FRET 过程：阳离子十四烷基三甲基溴化铵（TTAB）、阴离子十二烷基硫酸钠（SDS）和中性聚氧乙烯[4] 月桂醇醚（Brij 30）。通过紫外可见光谱和荧光光谱分析荧光团的溶解位点，解释了不同表面活性剂介质的 FRET 效率差异。FRET 与 pH 值的关系就像一个开-关开关，在碱性介质中显示出更高的效率。在各种表面活性剂体系中，两步 FRET 在碱性 TTAB 胶束中的运行效率最高，7HC 到 Flu（FRET-1）的效率高达 50%，Flu 到 RhB（FRET-2）的效率高达 30%，整体转移效率高达 23%。当供体与受体的比例为 1000/80/80 时，FRET-1 和 FRET-2 的能量传递效率分别达到 74% 和 84%。这凸显了 TTAB 胶束是基于 FRET 的高效多步人工光收集系统的理想支架。

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来源期刊

ChemPhotoChem Chemistry-Physical and Theoretical Chemistry

CiteScore

5.80

自引率

5.40%

发文量

165

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