Thiacalix[4]arene derivatives as radium ionophores: a study on the requirements for Ra2+ extraction
作者:Fijs W. B. van Leeuwen、Hans Beijleveld、Aldrik H. Velders、Jurriaan Huskens、Willem Verboom、David N. Reinhoudt
DOI:10.1039/b501587a
日期:——
thiacalix[4]crown-5 and -6 dicarboxylic acids (3a,b), and thiacalix[4]arene di- and tetracarboxylic acids (6 and 8). Thiacalix[4]arene dicarboxylic acid (6) already exhibits a high 226Ra2+ selectivity, but this is significantly improved in the case of 3b, having an additional crown-(6-)ether bridge. The covalent combination of a crownether and carboxylic acid substituents as in the thiacalix[4]arenes