1. a Centro de Química, Dept. Chemistry , University of Coimbra , Coimbra, Portugal
2. b Dept. Physical Chemistry , University of La Laguna , Tenerife
3. c Unidade de Espectroscopia RMN, Dept. Chemistry , University of Coimbra , Coimbra, Portugal
4. d Unidade de Química‐Física Molecular , Dept. Chemistry, University of Coimbra , Coimbra, Portugal