1. Department of Chemistry University of Isfahan Isfahan 81746-73441 Iran
2. Centro de Química Estrutural Faculdade de Ciências da Universidade de Lisboa, Campo Grande 1749-016 Lisboa Portugal
3. Department of Chemical Biological, Pharmaceutical and Environmental Sciences University of Messina, Viale Ferdinando Stagno D'Alcontres 31 I-98166 Messina Italy.
4. Department of Physics, School of Engineering & Technology Jain University Bangalore 562 112 India.
5. Department of Studies in Physics University of Mysore, Manasagangotri Mysore 570 006 India