期刊
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
卷 40, 期 3, 页码 183-187出版社
SPRINGER
DOI: 10.1023/A:1011821612309
关键词
calixarene; calix[4]-bis-crown; complexation; crown ether; crystal structure
An unsymmetrical calix[4]-bis-crown ether having both conventional crown-6 and dibenzocrown-6 rings in a fixed 1,3-alternate conformation was synthesized with good yield by the reaction of a monocyclic calix[4]crown-6 with dibenzodimesylate in the presence of cesium carbonate. The cesium ion selectivity among alkali metal ions increased compared to symmetrical calix[4]-bis-crown-6. The solid state structure of the ligand-cesium complex illustrates a 1:2 complex ratio. On the contrary, in solution, e.g., extraction equilibrium and H-1 NMR experiment gave a 1:1 complex ratio. From the result of the chemical shift change upon metal ion complex, the cesium ion seems to prefer the dibenzocrown loop to the conventional crown-6 ring.
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