1. Department of Chemistry, FMKMC College, Constituent College of Mangalore University, Madikeri 571201, Karnataka, India
2. Chemistry Department King Saud University, P.O. box 2455, Riyadh 11451, Saudi Arabia
3. Chemistry Department, College of Science and Chemical Engineering, Aarhus University, Norrebrogade 44, Aarhus C 8000, Denmark