1. Department of chemistry, Panjab University, Sector 14, Chandigarh 160014, India, http://chemistry.puchd.ac.in/show‐biodata.php?qstrempid=5532&qstrempdesigcode=10
2. Department of chemistry, DAV College, Sector 10, Chandigarh 160011, India, http://www.davchd.com
3. Institut für Anorganische Chemie, Technische Universität Bergakademie, Freiberg 09596 Freiberg, Germany