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Shirley89

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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
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