1. Institute of Macromolecular Chemistry; Czech Academy of Sciences; 16206 Prague Czech Republic
2. Charles University in Prague, Faculty of Science; 12843 Prague Czech Republic
3. Department of Chemistry; Faculty of Science, University of Tanta; Tanta 31527 Egypt
4. Institute of Basic and Applied Sciences; Egypt-Japan University of Science and Technology; New Borg El-Arab City Alexandria 21934 Egypt