1. Scientist, IRNA/CSIC of Salamanca, Cordel de Merinas 40-52, 37008 Salamanca, Spain.
2. Postdoctoral Grant IRNA/CSIC of Salamanca, Cordel de Merinas 40-52, 37008 Salamanca, Spain.
3. Postdoctoral Grant, Univ. of Salamanca, Plaza de Los Caídos, s/n, 37008 Salamanca, Spain.
4. Full Professor, Dept. of Inorganic Chemistry, Univ. of Salamanca, Plaza de los Caídos, s/n, 37008 Salamanca, Spain.