INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Thermal behaviour of hafnium diethylenetriaminepentaacetate studied using the Perturbed Angular Correlation Technique
Autor/es:
CECILIA Y. CHAIN; PATRICIA C. RIVAS; ALBERTO F. PASQUEVICH
Revista:
RADIOCHIMICA ACTA
Editorial:
OLDENBOURG VERLAG
Referencias:
Lugar: Munich; Año: 2014 vol. 102 p. 459 - 464
ISSN:
0033-8230
Resumen:
Polyaminecarboxilic ligands like diethylenetriaminepentaacetic acid form stable complexes with many heavymetal ions, excelling as cation chelants especially in the field of radiopharmacy. The aim of this work is to characterize,by using the Time Differential Perturbed Angular Correlations (TDPAC) technique, the hyperfine interactions at hafnium sites in hafnium diethylenetriaminepentaacetate and to investigate their evolution as temperature increases. TDPAC results for KHfDTPA⋅3H2O obtained by chemical synthesis yield awell defined and highly asymmetric interaction of quadrupole frequency 141Mrad/s, which is consistent with the existence of a unique site for the metal in the crystal lattice. The thermal behaviour of the chelate is investigated by means of differential scanning calorimetry and thermogravimetrical analyses revealing that an endothermic dehydration of KHfDTPA⋅3H2O takes place in one step between 80 ∘C and 180 ∘C. The anhydrous KHfDTPA thus arising is characterized by a fully asymmetric and well defined interaction of quadrupole frequency 168Mrad/s.