Affiliation: | 1. Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Payathai Road, Pathumwan District, Bangkok 10330 (Thailand), Fax: (+66)?2‐2187598;2. Advanced Organic Materials and Devices Laboratory, Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Warinchumrap, Ubon Ratchathani, 34190 (Thailand) |