1. Department
of Chemistry and Key Laboratory for Preparation and Application of
Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong 515063, PR China
2. Department
of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
3. Chemistry Department, Faculty
of Science, King Abdulaziz University, PO Box 80203 Jeddah 21589, Saudi Arabia