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首页> 外文期刊>ACS Omega >Ultrafast Dynamics of Electronically Excited Host–Guest Complexes of Cucurbiturils with Styryl Dyes
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Ultrafast Dynamics of Electronically Excited Host–Guest Complexes of Cucurbiturils with Styryl Dyes

机译：用STYRYL染料的葫芦菌电子激发宿主 - 客销复合物的超快动态

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摘要

The relaxation mechanism of electronically excited states of host–guest complexes between cucurbiturils (CB) and pyridinium styryl dyes is considered in detail on the basis of the recent results obtained by the up-conversion fluorescence technique. The addition of CB to aqueous dye solutions increases the longest fluorescence decay times from about 50 ps for the free dyes to 100–150 ps for the bound ones. This is attributed to the braking of intramolecular rotations around the single bonds of the styryl moiety that is provided by guest’s displacement inside the cavity, whose driving force is a Coulombic interaction of the styryl dye cation and negatively charged CB portals. This displacement, a translational movement along the CB axis, is associated with the observed decay time of about 1 ps. There is also a characteristic time of about 100 fs, attributed to vibrational relaxation. In fact, such complexes can operate as a molecular machine, the molecular switch.
机译：在通过上转换荧光技术获得的最近结果，详细考虑了葫芦菌（CB）和吡啶吡啶染料之间的电子激发态的宿主访客复合物的弛豫机理。将Cb加入到含水染料溶液中，对于所述结合末端的游离染料至100-150ps，将最长的荧光衰减时间从约50ps增加到100-150ps。这归因于通过在腔内的位移提供的STYRYL部分的单键周围的分子内旋转的制动，其驱动力是STYRYL染料阳离子和带负电的CB门户的库仑相互作用。该位移，沿CB轴的平移运动与观察到的衰减时间约为1ps。还有约100 fs的特征时间，归因于振动松弛。实际上，这种配合物可以作为分子机，分子开关操作。

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