1. Department of Chemistry, Guru Nanak Dev University, Amritsar 143 005, India, Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), SAS Nagar, Punjab 160062, India, Department of Chemistry, Horward University, Washington, D.C. 20059, and Departamento de Quimica Inorganica, Facultad de Farmacia, Universidad de Santiago, 15782 Santiago, Spain