1. a Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey
2. b Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey
3. c Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey
4. d Department of Chemistry, Biochemistry Division, Hacettepe University, Ankara, Turkey. denizli@hacettepe.edu.tr