1. Tata Institute of Fundamental Research Hyderabad, Gopanpally Hyderabad- 500107 Telangana India
2. Theoretical Sciences Unit Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore- 560064 India
3. Present address: Laboratory for Computational Molecular Design Institute of Chemical Sciences and Engineering Ecole Polytechnique Federale de Lausanne (EPFL) 1015 Lausanne Switzerland
4. Krupp-Chair of General and Inorganic Chemistry Saarland University 66123 Saarbrücken Germany
5. Department of Chemistry Indian Institute of Technology Kanpur Kanpur- 208016 India