Abstract
Cd-113 and Al-27 NMR parameters were used to investigate the Cd 2+ and Al 3+ hexaaquo metal ions adsorbed on some silica gels and zeolite NaY. No significant variations of the chemical shifts of cadmium and aluminum signals were observed for the aquated ions onto the pores with respect to those of the bulk solutions, thus indicating the absence of oservable specific interactions with the surface. On the contrary an increasing broadness of the signals as the pore size decreased as well as dramatic shortenings of Cd-113 and Al-27 NMR spin-lattice relaxation times were obtained. These variations were mainly ascribed to a reduced mobility of the aquo ions inside the pores. From the comparative analysis of Cd-113 and Al-27 relaxation data the correlation times of Cd(H 2O) 6 2+ and Al(H 2O) 6 3+ adsorbed species were estimated together with the quadrupolar coupling constants for Al(H 2O) 6 3+.
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