Exceptionally high selectivity for cesium ions (α(Cs/Na) > 33000) is displayed by calix[4]arenecrowns-6 in the 1,3-alternate conformation. They also remove 137Cs quantitatively (>96%) from radioactive waste that is 1 M in HNO3. The complexation properties result from the simultaneous operation of several effects: the size of the crown ether ring, the polarity of the calix conformation, and the strength of the cation/π-electron interactions. The latter interaction was evident in the X-ray crystal structure of the cesium complex (shown on the right).

1,3-Dialkoxycalix[4]arenecrown-6 in 1,3-Alternate Conformation: Cesium-Selective Ligands that Exploit Cation-Arene Interactions / R. UNGARO; A. CASNATI; F. UGOZZOLI; A. POCHINI; J-F. DOZOL; C. HILL; H. ROUQUETTE. - In: ANGEWANDTE CHEMIE. INTERNATIONAL EDITION IN ENGLISH. - ISSN 0570-0833. - 33(1994), pp. 1506-1509. [10.1002/anie.199415061]

1,3-Dialkoxycalix[4]arenecrown-6 in 1,3-Alternate Conformation: Cesium-Selective Ligands that Exploit Cation-Arene Interactions

UNGARO, Rocco;CASNATI, Alessandro;UGOZZOLI, Franco;POCHINI, Andrea;
1994

Abstract

Exceptionally high selectivity for cesium ions (α(Cs/Na) > 33000) is displayed by calix[4]arenecrowns-6 in the 1,3-alternate conformation. They also remove 137Cs quantitatively (>96%) from radioactive waste that is 1 M in HNO3. The complexation properties result from the simultaneous operation of several effects: the size of the crown ether ring, the polarity of the calix conformation, and the strength of the cation/π-electron interactions. The latter interaction was evident in the X-ray crystal structure of the cesium complex (shown on the right).
1,3-Dialkoxycalix[4]arenecrown-6 in 1,3-Alternate Conformation: Cesium-Selective Ligands that Exploit Cation-Arene Interactions / R. UNGARO; A. CASNATI; F. UGOZZOLI; A. POCHINI; J-F. DOZOL; C. HILL; H. ROUQUETTE. - In: ANGEWANDTE CHEMIE. INTERNATIONAL EDITION IN ENGLISH. - ISSN 0570-0833. - 33(1994), pp. 1506-1509. [10.1002/anie.199415061]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2313402
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