1. Department
of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, Tamil Nadu India
2. Department
of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
3. Department
of Physics, University College of Engineering, Anna University Constituent College, Nagercoil 629 004, Tamil
Nadu India