1. Contribution from the Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, ESTGA, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, Department of Physics, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal, and Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.