Calix[4]arenes diametrically substituted at the lower rim with two carboxylic acid and two tertiary amide binding groups were obtained in good yields and their acid-base properties studied in methanol solution. Complexation studies, performed in methanol by potentiometry, show that mononuclear (MLHz, z = 0, 1) or dinuclear (M2L) complexes are formed with alkali metal cations, whereas MxL2Hz (x = 1, 2, z = 0, 1) species, involving two ligands, are also present with alkaline-earth cations. Both ligands 2 and 3 show a remarkable selectivity for Ca2+ and Sr2+ among alkali and alkaline-earth metal ions.
Synthesis and binding properties of calix[4]arene diamide dicarboxylic acids / ARNAUD NEU, F.; Barboso, S.; Casnati, Alessandro; Pinalli, A.; SCHWING WEILL, M. J.; Ungaro, Rocco. - In: NEW JOURNAL OF CHEMISTRY. - ISSN 1144-0546. - 24:(2000), pp. 967-972. [10.1039/b006505f]
Synthesis and binding properties of calix[4]arene diamide dicarboxylic acids
CASNATI, Alessandro;UNGARO, Rocco
2000-01-01
Abstract
Calix[4]arenes diametrically substituted at the lower rim with two carboxylic acid and two tertiary amide binding groups were obtained in good yields and their acid-base properties studied in methanol solution. Complexation studies, performed in methanol by potentiometry, show that mononuclear (MLHz, z = 0, 1) or dinuclear (M2L) complexes are formed with alkali metal cations, whereas MxL2Hz (x = 1, 2, z = 0, 1) species, involving two ligands, are also present with alkaline-earth cations. Both ligands 2 and 3 show a remarkable selectivity for Ca2+ and Sr2+ among alkali and alkaline-earth metal ions.| File | Dimensione | Formato | |
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