1. Department of Chemistry, University of Benghazi, Benghazi Qar Yunis 9480, Libya
2. School of Chemistry and Biosciences, University of Bradford, Bradford BD7 1DP, U.K.
3. Department of Chemistry, The University of Sheffield, Sheffield S10 2TN, U.K.
4. Department of Geography, The University of Sheffield, Sheffield S10 2TN, U.K.