* Corresponding authors

^a H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
E-mail: abdul_hameed8@hotmail.com
Fax: +92-21-3481901
Tel: +92-21-99261701-2

^b Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad, KPK, Pakistan 22060

^c Department of Chemistry, Forman Christian College, A Chartered University, Ferozepur Road, Lahore, Pakistan

^d Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, Pakistan

^e Leibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany

^f Department of Physical Chemistry, University of Rostock, Dr.-Lorenz-Weg 1, 18059 Rostock, Germany

^g Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan