1. Department of Chemistry, Indian Institute of Technology—Kanpur, Kanpur-208016, India, Department of Chemistry, National University of Singapore, Singapore, CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France, and Université de Bordeaux, UPR 8641, Pessac, F-33600, France