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 / Ungaro, Rocco; Casnati, Alessandro; Ugozzoli, Franco; Pochini, Andrea; 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;
1994-01-01
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).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
