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love36183618

木虫 (初入文坛)

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BCDO与DNA相互作用的紫外/可见吸收光谱见图3.33所示。若荧光分子以嵌入方式结合于DNA双螺旋的碱基对时,其紫外吸收光谱会表现出峰位的红移以及减色效应。
由图3.33可以看出,DNA与BCDO作用后,BCDO的吸收光谱在260nm处的特征吸收峰产生明显的减色效应,这可认为是BCDO与DNA发生了嵌插作用。这是由于插入配体的BCDO小分子与DNA的配体的π空轨道与碱基的π*轨道发生偶合,偶合以后的π*轨道因为部分填充电子,使得π~π*跃迁几率减小,从而产生减色效应。
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频回眄睐

至尊木虫 (职业作家)

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love36183618: 金币+12, 翻译EPI+1, ★★★很有帮助 2012-04-17 15:45:47
The UV-Vis spector of the interaction between BCDO and DNA is seen in the figure 3.33 .When fluorescent molecule binded with double helix DNA in a imbedded way ,it UV-Vis spector will display a red shift and hypochromic effect on the peak .
From the picture of 3.33 ,we can see that BCDO’s absorb spector has a special absorption peak after the action between DNA and BCDO ,from which we think there has a intercalation .we conclude that the π space orbit of  the  ligand of BCDO and DNA has a coupling with the π* orbit ,then the electron in the π* orbital increased to reduce transition probability on π~π* and we can see a hypochromic effect .
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2楼2012-04-15 18:53:53
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love36183618

木虫 (初入文坛)

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2楼: Originally posted by 频回眄睐 at 2012-04-15 18:53:53:
The UV-Vis spector of the interaction between BCDO and DNA is seen in the figure 3.33 .When fluorescent molecule binded with double helix DNA in a imbedded way ,it UV-Vis spector will display a red ...

非常感谢!
3楼2012-04-17 15:46:17
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