1. Department of Organic ChemistryArrhenius LaboratoryStockholm University 10691 Stockholm Sweden
2. Department of Materials and Environmental ChemistryArrhenius LaboratoryStockholm University 10691 Stockholm Sweden
3. Present address: Borregaard P.O. Box 162 1701 Sarpsborg Norway
4. Department of Molecular SciencesSwedish University of Agricultural Sciences P.O. Box 7015 75007 Uppsala Sweden
5. Present address: Wigner Research Centre for Physics Konkoly-Thege Miklós út 29–33 1121 Budapest Hungary