Acknowledgments
All the authors thank the management of Kongunadu Arts and Science College, Coimbatore, India, for providing research facilities. We thank SAIF, Kochi, India, for the spectral data and Karunya University, Coimbatore, India, for the biological studies. One of the authors (AA) thanks the University Grants Commission, Hyderabad, India, for financial support [MRP-4997/14 (SERO- UGC)].