A Comparative Study on the Binding Behaviors of β-Cyclodextrin and Its Two Derivatives to Four Fanlike Organic Guests
作者:Le Xin Song、Hai Ming Wang、Xue Qing Guo、Lei Bai
DOI:10.1021/jo801436h
日期:2008.11.7
Four fanlike organic compounds, 1-ethoxybenzene (EOB), 1-butoxybenzene (BOB), 1-dodecyloxybenzene (DOB), and 1-(dodecyloxy)-2-methoxybenzene (DOMB), were chosen as guests, and beta-cyclodextrin (beta-CD) and its two derivatives, mono(2-O-2-methyl)-beta-CD and mono(2-O-2-hydroxy-propyl)-beta-CD, were chosen as hosts. Energy changes involved in host-guest inclusion processes were clearly obtained by
选择了四种扇状有机化合物1-乙氧基苯(EOB),1-丁氧基苯(BOB),1-十二烷氧基苯(DOB)和1-(十二烷氧基)-2-甲氧基苯(DOMB)作为客体,并选择了β-环糊精( β-CD)及其两个衍生物(单(2-O-2-甲基)-β-CD和单(2-O-2-羟基-丙基)-β-CD被选为宿主。通过应用半经验的PM3计算,可以清楚地获得主客体包含过程中涉及的能量变化。据此,提出了客体-客体包涵体的可能结构。通过紫外-可见光谱和核磁共振((1)H NMR)滴定研究水溶液中的包合物体系,并使用贝内西-希尔德布兰德方程确定包合物的形成常数(K)。而且,制备了两种具有EOB和DOB的β-CD固体包合物,并通过傅里叶变换红外光谱,X射线粉末衍射,(1)H NMR,电喷雾电离质谱和热重分析对其进行了表征。结果表明,包合物中主体-客体的化学计量比在固态和水溶液中均为1:1。对于同一宿主,K值以EOB