**Author details**

Tânia F.G.G. Cova, Sandra M.A. Cruz, Artur J.M. Valente\*, Paulo E. Abreu, Jorge M.C. Marques and Alberto A.C.C. Pais

\*Address all correspondence to: avalente@ci.uc.pt

CQC, Department of Chemistry, University of Coimbra, Coimbra, Portugal
