1. Department of Chemistry, Babes-Bolyai University (BBU), Str. Arany Janos Nr. 11, RO-400028 Cluj-Napoca, Romania
2. Faculty of Physics, Babes-Bolyai University (BBU), Str. Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
3. Ivanovo State University of Chemistry and Technology, Sheremetevskiy Str. 7, 153000 Ivanovo, Russia