Experimental Evidence for Water Mediated Electron Transfer Through Bis-Amino Acid Donor-Bridge-Acceptor Oligomers
Experimental Evidence for Water Mediated Electron Transfer Through Bis-Amino Acid Donor-Bridge-Acceptor Oligomers
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DOI：
10.1021/ja8079324
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发表时间：
2009-02-18
影响因子：
15
通讯作者：
Waldeck, David H.
中科院分区：
文献类型：
--
作者：
Chakrabarti, Subhasis;Parker, Matthew F. L.;Waldeck, David H.
这项工作比较了两种不同溶质分子（D-SSS-A 和 D-SRR-A）在水和 DMSO 溶剂中的光诱导单分子电子转移速率常数。 D-SSS-A 溶质在电子供体和受体单元之间有一个裂缝，该裂缝能够包含水分子，但对于 DMSO 来说太小。 D-SSS-A 在水中的速率常数显着高于没有裂缝的 D-SRR-A，并且任一溶质在 DMSO 中的速率常数均显着更高。速率常数的增强是通过涉及水分子的电子隧道路径来解释的。
This work compares the photoinduced unimolecular electron transfer rate constants for two different solute molecules (D-SSS-A and D-SRR-A) in water and DMSO solvents. The D-SSS-A solute has a cleft between the electron donor and acceptor units, which is able to contain a water molecule but is too small for DMSO. The rate constant for D-SSS-A in water is significantly higher than that for D-SRR-A, which lacks a cleft, and significantly higher for either solute in DMSO. The enhancement of the rate constant is explained by an electron tunneling pathway that involves water molecule(s).