1. Department of Chemistry, Faculty of Science Maejo University Chiang Mai 50290 Thailand
2. School of Chemistry, Institute of Science Suranaree University of Technology Nakhon Ratchasima 30000 Thailand
3. Department of Chemistry and Physics, La Trobe Institute for Molecular Science La Trobe University Melbourne VIC 3086 Australia
4. Centre for Biospectroscopy and School of Chemistry Monash University VIC 3800 Australia