1. Saint Petersburg State University, Universitetskaya
nab. 7/9, 199034, Saint Petersburg, Russian Federation
2. Centro
de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
3. Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
4. Institute of Macromolecular Compounds of Russian Academy of Sciences, V.O. Bolshoii Pr. 31, 199004 Saint Petersburg, Russian Federation