1. Post Graduate and Research Department of Chemistry, Maharaja’s College, Ernakulam 682 011, India
2. School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686 560, India
3. Inter-University Instrumentation Centre, Mahatma Gandhi University, Kottayam 686 560, India
4. Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, México D. F. 04510, Mexico