1. Universitat Rovira i Virgili; Departament de Química Física i Inorgànica; C/Marcel.lí Domingo 1 ES 43007 Tarragona Spain
2. Stockholm University; Department of Organic Chemistry, Arrheniuslaboratoriet; SE-106 91 Stockholm Sweden
3. Umeå University; Department of Chemistry; SE-901 87 Umeå Sweden