Authors A Kumar and P Arya are thankful to the Council of Scientific and Industrial Research, New Delhi, India, for the award of Senior Research Fellowship. The authors are also grateful to DST-FIST for providing financial assistance to set up an NMR instrument in the Department of Chemistry, Kurukshetra University, Kurukshetra, under the FIST program no. SR/FST/CS-I/2017/12(C). The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.