1. Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
2. Department of Chemistry Hacettepe University Ankara 06800 Turkey
3. Scientific and Technological Research Application and Research Center Sinop University Sinop 57000 Turkey
4. UNAM-National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey