1. Organic Research Laboratory, Department of Chemistry, Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia
2. Colloid Chemistry & Nanotechnology Laboratory, Centre for Fundamental and Frontier Sciences in Nanostructure Self‐Assembly (FSSA), Department of Chemistry, Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia
3. Visible Spectroscopy Laboratory, Centre for Ionics University of Malaya (CIUM), Department of Physics, Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia