1. Department
of Organic and Inorganic Chemistry, Polymer Laboratory, Federal University of Ceará, CX 12200 Fortaleza, Brazil
2. State University of Ceará, CEP 60740-903, Fortaleza, Ceará, Brazil
3. Department
of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
4. School
of Chemistry, University of Manchester, Manchester M13 9PL, U.K.