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首页> 外文期刊>Chemistry: A European journal >Directly Attached Bisdonor-BF2 Chelated Azadipyrromethene- Fullerene Tetrads for Promoting Ground and Excited State Charge Transfer
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Directly Attached Bisdonor-BF2 Chelated Azadipyrromethene- Fullerene Tetrads for Promoting Ground and Excited State Charge Transfer

机译：直接附着的BISDONOR-BF2螯合的阿氮吡咯甲肾上腺素 - 富勒烯四面体，用于促进地面和激励国家费用转移

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摘要

The efficiency and mechanism of electron- and energy-transfer events occurring in both natural and synthetic donor-acceptor systems depend on their distance, relative orientation, and the nature of the surrounding media. Fundamental knowledge gained from model studies is key to building efficient energy harvesting and optoelectronic devices. Faster charge separation and slower charge recombination in donor-acceptor systems is often sought out. In our continued effort to build donor-acceptor systems using near-IR sensitizers, in the present study, we report ground and excited-state charge transfer in newly synthesized, directly linked tetrads featuring bisdonor (donor=phenothiazine and ferrocene), BF_2-chelated azadipyrromethane (azaBODIPY) and C_(60) entities. The tetrads synthesized using multistep synthetic procedure revealed strong charge-transfer interactions in the ground state involving the donor and aza- BODIPY entities. The near-IR emitting azaBODIPY acted as a photosensitizing electron acceptor along with fullerene whereas the phenothiazine and ferrocene entities acted as electron donors. The triads (bisdonor-azaBODIPY) and tetrads revealed ultrafast photoinduced charge separation leading to D~(·+)-azaBODIPY~(·-)-C_(60) and D~(·+)-azaBODIPY-C_(60)~(·-) (D=phenothiazine or ferrocene) charge separated states from the femtosecond transient absorption spectral studies in both polar and nonpolar solvent media. The charge-separated states populated the triplet excited state of azaBODIPY prior returning to the ground state.
机译：在天然和合成供体 - 受体系统中发生的电子和能量转移事件的效率和机制取决于它们的距离，相对取向和周围介质的性质。模型研究中获得的基本知识是建立高效能量收集和光电器件的关键。更快的电荷分离和供体 - 受体系统中的电荷重组较慢的电荷重组通常被展开。在我们继续努力使用近红外敏感剂构建捐助者 - 受体系统，在本研究中，我们在新合成的，直接连接的Tetrad中报告了地面和兴奋状态电荷转移，其具有Bisdonor（供体=吩噻嗪和二茂铁），BF_2-Chelated Azadiphyromethane（八角形杏仁）和C_（60）实体。使用多步合成方法合成的四胞胎在涉及供体和AZA-BOBIPY实体的地面状态下显示出强烈的电荷转移相互作用。近红外氮斑斑杏仁贴花作为光敏电子受体以及富勒烯，而吩噻嗪和二茂铁的作用是电子给体。三合会（Bisdonor-Azabodipy）和Tetrads透露超快的光抑制电荷分离，导致D〜（·+） - azabodipy〜（· - ） - c_（60）和d〜（·+） - azabodipy-c_（60）〜（ · - ）（d =吩噻嗪或铁茂）从极性和非极性溶剂介质中的飞秒瞬时吸收光谱研究中的分离状态。分离的状态填充了先前返回地面状态的雅皮德佩奇的三重态激发状态。

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