1. Institute of Chemical Process Fundamentals, v.v.i., Academy of Sciences of the Czech Republic, Rozvojová 135, 165 02 Prague 6, Czech Republic
2. Institute of Macromolecular Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic
3. Institut de Chimie Moléculaire de Reims, UMR, CNRS 7312, Case postale 44 UFR des Sciences Exactes et Naturelles, BP 1039, 51687 Reims Cedex 2, France