Yonghong Zhang1,2, Waygen Thor1, Ka-Leung Wong1,* and Peter A. Tanner1,*
1 Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong S.A.R., P.R. China
2 College of Chemistry, Xinjiang University, Urumqi 830046, P.R. China