1. Department of Chemistry, Kakatiya University, Warangal, 506009 Andra Pradesh, India, Technical Analytical Research Group of the Hungarian Academy of Sciences, Institute for General and Analytical Chemistry of the Technical University, Szent Gellért tér 4, H-1111 Budapest, Hungary, and Universität Hannover, Institut für Organische Chemie, Schneiderberg 1B, D-30167 Hannover, Germany