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由于萘酚,1-羟基芘和9-羟基菲的分子中都含有极性的-OH和非极性的苯环,苯环大小适于进入环糊精的圆茼中,并通过疏水键结合,这样这3种物质就与环糊精形成包合物,从图6也可以看出,萘酚和9-羟基菲被包合后λmax红移1nm左右,从荧光光谱上可看到向长波长方向移动,这说明萘酚和9-羟基菲与环糊精空腔结构尺寸匹配性相当.同时从热力学参数可知,温度从298K升到323K时 △H为正值,表明包合物随温度上升而趋于稳定.通过包合物的热力学参数△G,△H,△S,说明整个包合过程主要受到熵变的控制,疏水作用力为主要驱动力 [search]环糊精[/search] |
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liyulong06
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| As naphthol, 1-hydroxypyrene and 9-hydroxyl phenanthrene all contain the elements of the polarity -OH and non-polarity of benzene. Benzene can ring suitable size for cyclodextrin into the circle Chrysanthemum coronarium, and through the combination of hydrophobic bond So that these three kinds of material on Cyclodextrin and the formation of inclusion. From Figure 6 also shows that the naphthol and 9-hydroxyl phenanthrene were hydroxyl phenanthrene inclusion after λ max redshifts around 1 nm from the fluorescence spectrometry can be seen on the long Wavelength move, indicating naphthol and 9-hydroxylphenanthrene cyclodextrin cavity structure and size of a match. At the same time from the thermodynamic parameters indicates that the temperature rose to 298 K from 323 K,△H is positive that the inclusion with the temperature Rising stabilizing. Through the inclusion of thermodynamic parameters △G,△H,△S,the inclusion of the entire process of major change under the control of entropy, hydrophobic force as the main driving force |
2楼2008-06-07 08:20:40