1. Department of Chemistry, St. John's College (Affiliated to University of Kerala), Anchal, Kollam, Kerala, 691308, India
2. Department of Chemistry, Mar Ivanios College (Affiliated to University of Kerala), Nalanchira, Thiruvanathapuram, Kerala, 695015, India
3. Department of Chemistry, University of Kerala, Kariavattom Campus, Thruvananthapuram, Kerala, 691308, India