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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Ultrafast Intramolecular Photoinduced Energy Transfer Events in Benzothiazole- Borondipyrromethene Donor-Acceptor Dyads
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Ultrafast Intramolecular Photoinduced Energy Transfer Events in Benzothiazole- Borondipyrromethene Donor-Acceptor Dyads

机译：苯并噻唑-硼二吡咯甲烯供体-受体二元组中的超快分子内光诱导的能量转移事件。

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摘要

Benzothiazole (BTZ)-boron dipyrromethene (BODIPY)-based dyads, Dyad 1 and Dyad 2, containing BTZ as light energy absorbing and transferring antenna while BODIPY as an energy acceptor, linked together with ethoxy and ester spacers, respectively, have been synthesized, and photoinduced energy transfer (PEnT) events occurring within these systems were studied. Both of the dyads were characterized by H-1 NMR, MALDI-MS, UV-visible, steady-state fluorescence, and femtosecond transient absorption spectroscopic as well as electrochemical methods. A comparison of the absorption spectra of the dyads with their reference compounds. (i.e., BTZ-OMe and BODIPY-OMe) revealed minimal ground-state interactions between chromophores in Dyad 1 while a more pronounced effect in case of Dyad 2. Electrochemical: and computational studies revealed that the LUMO of both of the dyads is located on BODIPY, indicating that the reduction of BODIPY moiety is easier as compared to that of BTZ moiety. Selective excitation on BTZ in the dyads at similar to 300 nm resulted in :quenching of the BTZ emission followed by the appearance of BODIPY emission showing efficient energy transfer from singlet excited BTZ ((1)BTZ*) to BODIPY. The photoinduced energy transfer phenomenon was observed in four different solvents of varying polarity. The driving forces of energy transfer (Delta G(EN)) in both of the dyads were found to be exothermic, and, in case of Dyad 1, they followed the trend toluene > DCB approximate to DMF > acetonitrile. Transient absorption studies performed in polar solvents such as acetonitrile revealed an efficient photoinduced energy transfer (similar to 95%) from (1)BTZ* to BODIPY (k(EN) = 6.17 X 10(12) s(-1) for Dyad 1 and 2.5 X 10(12) s(-1) for Dyad 2 in acetonitrile) creating singlet excited BODIPY ((1)BTZ*-BODIPY -> BTZ-(BODIPY)-B-1*), indicating the quenched pathway is exclusively a PEnT process.
机译：合成了以苯并噻唑（BTZ）-硼二吡咯亚甲基（BODIPY）为基的Dyad 1和Dyad 2，它们分别以BTZ作为光能吸收和转移天线，而BODIPY作为能量受体，分别与乙氧基和酯间隔基连接在一起，并且研究了在这些系统中发生的光诱导能量转移（PEnT）事件。这两个双分子都通过H-1 NMR，MALDI-MS，紫外可见光，稳态荧光和飞秒瞬态吸收光谱以及电化学方法进行了表征。二单元组与参考化合物的吸收光谱的比较。 （即BTZ-OMe和BODIPY-OMe）揭示了Dyad 1中发色团之间的最小基态相互作用，而对于Dyad 2则更为明显。 BODIPY，表明与BTZ部分相比，BODIPY部分的还原更容易。在近似于300 nm的二元组中BTZ的选择性激发导致：BTZ猝灭，随后出现BODIPY发射，表明从单重激发BTZ（（1）BTZ *）到BODIPY的有效能量转移。在四种不同极性的溶剂中观察到光诱导的能量转移现象。发现在两个二元组中能量转移的驱动力（Delta G（EN））是放热的，对于Dyad 1，它们遵循甲苯> DCB近似于DMF>乙腈的趋势。在极性溶剂（例如乙腈）中进行的瞬态吸收研究表明，对于Dyad 1，从（1）BTZ *到BODIPY的光诱导能量有效转移（近似95％）（k（EN）= 6.17 X 10（12）s（-1））和在乙腈中Dyad 2的2.5 X 10（12）s（-1）产生单重激发的BODIPY（（1）BTZ * -BODIPY-> BTZ-（BODIPY）-B-1 *），表明淬灭的途径是唯一的PEnT流程。

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