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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Photoinduced Electron Transfer on #beta#-Sheet Cyclic Peptides
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Photoinduced Electron Transfer on #beta#-Sheet Cyclic Peptides

机译：在＃beta＃-Sheet环肽上的光诱导电子转移

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摘要

Gramicidin S analogues that contain a single pyrenyl group and a single p-nitrophenyl group at different positions were synthesized. Photoinduced electron transfer (ET) from an excited pyrenyl group located at the fourth position to a nitrophenyl group located at five different positions was investigated on the #beta#-sheet chains of the cyclic pepides. The observed ET rate constants displayeda complex dependence on the number of spacer units or on the edge-to-edge distance the two aromatic groups. The ET rate constants, however,showed a reasonable linear relationship with the equivalent #sigma#-distances calculated from the Beratan-Onuchic tunneling pathway model, if through-hydrogen-bond ET was taken into account. The results support the applicability of the tunneling pathway model on both helix and #beta#-sheet model petides.
机译：合成了在不同位置含有一个pyr基和一个对硝基苯基的豆蔻素S类似物。在环状肽的β-β-折叠链上研究了从位于第四位的激发的吡啶基到位于五个不同位置的硝基苯基的光诱导电子转移（ET）。观察到的ET速率常数显示出对间隔基单元数或两个芳族基团的边到边距离的复杂依赖性。然而，如果考虑通过氢键结合的ET，则ET速率常数与从Beratan-Onuchic隧穿路径模型计算的等效＃sigma＃-距离显示出合理的线性关系。结果支持隧道路径模型在螺旋形和＃beta＃-sheet模型佩蒂特上的适用性。

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