1. Department of Chemistry, Sri Venkateshwara College (University of Delhi), Dhaula Kuan, New Delhi 110021, India
2. Department of Chemistry, Manipur University, Canchipur, Imphal, Manipur 795003, India
3. Department of Chemistry, Acharya Narendra Dev College (University of Delhi), Govindpuri, Kalkaji, New Delhi 110019, India