1. Department
of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
2. Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
3. Department of Chemistry,
School of Science, Tianjin University, Tianjin 300072, P. R. China
4. Department of Organic Chemistry, Arrhenius
Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden