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首页> 外文期刊>Chemistry: A European journal >The role of electronic coupling in linear porphyrin arrays probed by single-molecule fluorescence spectroscopy
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The role of electronic coupling in linear porphyrin arrays probed by single-molecule fluorescence spectroscopy

机译：电子耦合在单分子荧光光谱探测线性卟啉阵列中的作用

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摘要

Single-molecule photophysical properties of two families of linear porphyrin arrays have been investigated by single-molecule fluorescence detection techniques. Butadiyne-linked arrays (Z_NB) with extensive φ-conjugation perform as photostable one-quantum systems. This demonstration has been suggested by the long-lasting initial emissive state and subsequent discrete one-step photobleaching in the fluorescence intensity trajectories (FITs). As in the behavior of a one-quantum system, Z_NB shows anti-bunching data in the coincidence measurements. On the other hand, in directly-linked arrays (Z_N) with strong dipole coupling, each porphyrin moiety keeps individual character in photobleaching dynamics. The stepwise photobleachings in the FITs account for this explanation. Most of the FITs of Z_N do not carry momentary cessation of fluorescence emission, which has been explained by the strongly bound electron-hole pair of Frenkel exciton that suppresses charge transfer between the molecule and surrounding polymers. These results give insight into the influences of interchromophorinc interactions between porphyrin moieties in the multiporphyrin arrays on their fluorescence dynamics at the single-molecule level.
机译：通过单分子荧光检测技术研究了线性卟啉阵列的两个家族的单分子光物理性质。具有广泛的φ共轭作用的丁二炔链接阵列（Z_NB）表现为光稳定的单量子系统。荧光强度轨迹（FIT）中持久的初始发射态和随后的离散一步光漂白表明了这一例证。与一量子系统的行为一样，Z_NB在重合测量中显示反聚束数据。另一方面，在具有强偶极耦合的直接连接阵列（Z_N）中，每个卟啉部分在光致漂白动力学中均保持各自的特征。 FIT中的逐步光漂白解释了这一解释。 Z_N的大多数FIT不会暂时停止荧光发射，这已通过Frenkel激子的强结合电子-空穴对来抑制，该Frenkel激子抑制了分子​​与周围聚合物之间的电荷转移。这些结果使人们深入了解了多卟啉阵列中卟啉部分之间的发色团相互作用对它们在单分子水平上的荧光动力学的影响。

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