1. Department of Chemistry, University of Malaya, 50603 Kuala Lumpur,
Malaysia
2. Department
of Chemistry, University of Bath, Bath BA2 7AY, United
Kingdom
3. College of Science, Department of Chemistry, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
4. Department of Chemistry, University of Waikato, Private Bag 3105,
Hamilton 3240, New Zealand
5. Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah, Saudi
Arabia