[1] Womens Christian Coll, Dept Phys, Nagercoil 629001, Tamilnadu, India
[2] Womens Christian Coll, Res Ctr, Nagercoil 629001, Tamilnadu, India
[3] Manonmaniam Sundaranar Univ, Tirunelveli 627012, Tamil Nadu, India
[4] Integral Univ, Dept Chem, Research Lab B043, Lucknow 226026, Uttar Pradesh, India
[5] King Saud Univ, Coll Sci, Dept Bot & Microbiol, POB 2455, Riyadh 11451, Saudi Arabia
[6] Karlsruhe Inst Technol, Inst Inorgan Chem, Engesserstr 15, D-76131 Karlsruhe, Germany
[7] Arignar Anna Govt Arts Coll, Dept Phys, Cheyyar 604407, Tamilnadu, India