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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >One- and Two-Photon Spectroscopy of Donor-Acceptor-Donor Distyrylbenzene Derivatives: Effect of Cyano Substitution and Distortion from Planarity
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One- and Two-Photon Spectroscopy of Donor-Acceptor-Donor Distyrylbenzene Derivatives: Effect of Cyano Substitution and Distortion from Planarity

机译：供体-受体-供体二苯乙烯基苯衍生物的一和两光子光谱：氰基取代和平面度畸变的影响

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摘要

The one- and two-photon spectroscopic properties of four symmetrically substituted donor-acceptor-donor distyrylbenzenes with either di-n-butyl- or diphenylamino donor groups and cyano acceptor groups are reported. It has been found that the position of the substitution of the electron-withdrawing cyano groups on the central phenylene ring as compared to the vinylene bond strongly affects the observed properties. In particular, the molecules with cyano substitution on the α-carbon of the vinylene linkage are characterized by weak fluorescence, short fluorescence lifetimes, and two-photon cross sections (δ) that are comparable to analogous molecules with no acceptor groups. In contrast, the molecules with acceptor substitution on the central phenylene ring are strongly fluorescent and have δ values roughly twice those of the vinyl-substituted molecules. These results are discussed in terms of the larger deviation of the conjugated backbone from planarity and the smaller distance between the donors and acceptors when the cyano groups are substituted on the vinylene carbon rather than the central phenylene ring.
机译：报道了具有两个正丁基或二苯基氨基供体基团和氰基受体基团的四个对称取代的供体-受体-供体二苯乙烯基苯的单光子和双光子光谱性质。已经发现，与亚乙烯基键相比，在中心亚苯基环上的吸电子氰基的取代位置强烈影响所观察到的性能。特别地，在亚乙烯基键的α-碳上具有氰基取代的分子的特征在于荧光弱，荧光寿命短和两光子截面（δ），其与没有受体基团的类似分子相当。相反，在中心亚苯基环上具有受体取代的分子是强荧光的，并且δ值大约是乙烯基取代的分子的δ值的两倍。当氰基基团被取代在亚乙烯基碳而不是中心亚苯基环上时，共轭主链与平面度的偏差较大，并且供体和受体之间的距离较小，讨论了这些结果。

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