期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 72, 期 20, 页码 7497-7503出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo070439a
关键词
-
[GRAPHICS] The synthesis and the spectroscopic studies of the amidourea based calix[4]arene sensors I and 2 are described. The 4-nitrophenyl based sensor I was synthesized in two steps from the corresponding calix [4]arene tetraethyl ester and shown to give rise to color changes in the UV-vis spectra in DMSO upon recognition of pyrophosphate and fluoride. Fitting the changes in the absorption spectra using nonlinear regression analysis indicated strong binding of several anions by I such as acetate and hydrogen phosphate in 1: 1 (Host:Guest) stoichiometry, and at higher concentration in 1:2 stoichiometry. The preorganized calix-cavity was, however, not found to host chlorine while binding of bromide was determined. At high concentrations of these anions, significant colorimetric changes were also observed that were clearly visible to the naked eye for both pyrophosphate and fluoride. The phenyl analogue 2 was made to enable analysis of the anion recognition using H-1 NMR titrations and showed that ions such as phosphate were bound in 1:1 stoichiometry, whereas the urea protons were shown to be significantly affected upon coordination to the anion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据