1. a Faculty of Chemistry , Bu-Ali Sina University , Hamedan 65174 , Iran
2. b Chemistry Department , Payame Noor University , Tehran 19395-4697 , Iran
3. c Department of Biology , Bu-Ali Sina University , Hamedan 65178-38683 , Iran
4. d Department of Chemistry , University of Otago , P.O. Box 56, Dunedin , New Zealand