International Journal of Chemical Science - Nasarawa Department of Chemistry, Nasarawa State University - 1(2), 2008; 2(1-2), 2009; 3(1-2), 2010; 4(1-2), 2011; 5(2), 2012; 7(1), 2015; ISSN: 2006-3350 LC Class. No.: QD1 / .I68