1. Department of Chemistry, University of Zanjan, Zanjan, Iran
2. Department of Chemistry, Islamic Azad University-East Tehran (Ghiam Dasht) of Branch, Tehran, Iran
3. Department of Chemistry, Abhar Branch, Islamic Azad University, Abhar, Iran
4. Department of Chemistry, Payame Noor University, Tehran, Iran
5. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea