1. Department of Chemistry, College of Science, University of Hail, Kingdom of Saudi Arabia
2. Department of Chemistry, Sultan Qaboos University, Al-Khod, Muscat, Oman
3. Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China
4. Department of Chemistry, University of Bath, Claverton Down, Bath, Avon BA2 7AY, UK