1. Department of Physical Chemistry and Research Institute of Theoretical and Computational Chemistry (IQTCUB) of University of Barcelona, C/ Martí i Franquès, 1. E-08028 Barcelona, Spain, Department of Chemistry, University of Lleida (UdL), Lleida, Spain, and Department of Biochemistry and Molecular Biology and Institute of Biomedicine (IBUB) of University of Barcelona and IDIBAPS, Barcelona, Spain