1. Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
2. Department of Chemistry Howard University Washington, D.C. 20059 USA
3. Department of Chemistry School of Advanced Sciences Vellore Institute of Technology Vellore Tamil Nadu 632014 India
4. Theoretical Chemistry Section Chemistry Division Bhabha Atomic Research Centre Mumbai-400085 (India) Homi Bhabha National Institute Mumbai 400085 India
5. Department of Sustainable Energy Engineering Indian Institute of Technology Kanpur Kanpur 208016 India