Affiliation: | (1) Faculdade de Filosofia, Ciencias E Letras de Ribeirão Preto, Campus Universitário, Universidade de São Paulo, Monte Alegre, 14.049 Ribeirão Preto, S.P., Brasil;(2) School of Chemistry and Molecular Sciences, University of Sussex, BN1 9QJ Brighton, UK;(3) Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, CS-162 06 Praha, Czechoslovakia |