Quinoxaline-Imidazolium Receptors for
Unique Sensing of Pyrophosphate and
Acetate by Charge Transfer
N. Jiten Singh,Eun Jin Jun,Kavitha Chellappan,Daniel Thangadurai,R. Prakash Chandran,In-Chul Hwang,*Juyoung Yoon,* andKwang S. Kim*
Center for Superfunctional Materials, Department of Chemistry, Pohang University of
Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea, and
Division of Nano Science and Department of Chemistry, Ewha Womans University,
11-1 Daehyon-Dong, Sodaemun-Ku, Seoul 120-750, Korea
Quinoxaline derivatives (1-4) bearing two imidazolium moieties are found to strongly bind anions and show unique charge-transfer fluorescent
responses to pyrophosphate and acetate, whereas they show excimer formation with other anions. Anion-binding studies are investigated
with fluorescence and 1H NMR analysis, single-crystal X-ray analysis, and theoretical calculations.
