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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >The 1:1 host-guest complexation between cucurbit[7]uril and styryl dye
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The 1:1 host-guest complexation between cucurbit[7]uril and styryl dye

机译：葫芦[7]尿素与苯乙烯基染料之间的1：1宿主-客体络合

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摘要

The photophysical properties of aqueous solution of styryl dye, 4-[(E)-2-(3,4-dimethoxyphenyl)ethenyl]-1-ethylpyridinium perchlorate (dye 1), in the presence of cucurbit[7]uril (CB[7]) was studied by means of fluorescence spectroscopy methods. The production of 1:1 host guest complexes in the range of CB[7] concentrations up to 16 μM with K = 1.0 × 10~6 M ~1 has been observed, which corresponds to appearance of the isosbestic point at 396 nm in the absorption spectra and a 5-fold increase in fluorescence intensity. The decay of fluorescence was found to fit to double-exponential functions in all cases; the calculated average fluorescence lifetime increases from 145 to 352 ps upon the addition of CB[7]. Rotational relaxation times of dye 1 solutions 119 ± 14 ps without CB[7] and 277 ± 35 ps in the presence of CB[7] have been determined by anisotropy fluorescence method. The comparison of the results of quantum-chemical calculations and experimental data confirms that in the host cavity dye 1 rotates as a whole with CB[7].
机译：在葫芦[7]尿嘧啶（CB [ 7]）通过荧光光谱法研究。观察到在CB [7]浓度高达16μM范围内，K = 1.0×10〜6 M〜1时产生1：1宿主客体复合物，这对应于396 nm处的等渗点的出现。吸收光谱和荧光强度的5倍增加。发现在所有情况下，荧光的衰减都适合于双指数函数。加入CB后，计算出的平均荧光寿命从145 ps增加到352 ps [7]。通过各向异性荧光法测定了染料1溶液在没有CB [7]的情况下的119±14 ps和在CB [7]存在下的277±35 ps的旋转弛豫时间。量子化学计算结果与实验数据的比较证实了染料1在主体腔中随CB整体旋转[7]。

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