1. Institute of Electronics and Information Technology, Lublin University of Technology, 38A Nadbystrzycka Str., 20-618 Lublin, Poland, Tel.: +48 81 538 4618, Fax: +48 81 538 4312
2. Department of Chemistry, North Ossetian State University after K. L. Khetagurov, 44-46 Vatutina Str., 362025 Vladikavkaz, Russia
3. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninsky Gory, 119899 Moscow, Russia