, Ahmed Al-Harrasi *Author for correspondence: Tel.: +96825446328; E-mail Address: aharrasi@unizwa.edu.om Natural & Medical Sciences Research Center, University of Nizwa, PO Box 33, Birkat Al Mauz, Nizwa 616, Sultanate of Oman , , , Touqeer Ahmad Natural & Medical Sciences Research Center, University of Nizwa, PO Box 33, Birkat Al Mauz, Nizwa 616, Sultanate of Oman Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, Pakistan , , , , &