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Shirley89Òø³æ (СÓÐÃûÆø)
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It is expected that the acid and base groups in SBA-15- A/B would be in equilibrium between the free acid and base and the ion pair that results from neutralization, and that the solvent would have a dramatic effect on this equilibrium, that is, protic solvents would confer different properties to aprotic solvents as a result of differing abilities to stabilize the neutralized ion pair. The equilibrium would lie towards the ion pair in polar, protic solvents, as proton exchange would be rapid and the protic solvent would stabilize the ion pair the most. Nonpolar, aprotic solvents would cause slower exchange of the protons and would stabilize an ion pair much less than a protic solvent, thus forcing the equilibrium in favor of the free acid and base. To investigate these possibilities, reactions were carried out in a variety of cosolvents to examine the effect of solvent polarity on conversion |
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°®ÓëÓêÏÂ: ½ð±Ò+1 2015-03-11 18:42:46
Shirley89: ½ð±Ò+5, ·ÒëEPI+1, ¡ïÓаïÖú 2015-03-13 09:34:49
°®ÓëÓêÏÂ: ½ð±Ò+1 2015-03-11 18:42:46
Shirley89: ½ð±Ò+5, ·ÒëEPI+1, ¡ïÓаïÖú 2015-03-13 09:34:49
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