Browsing by Author "Choi, Yusun"

Now showing 1 - 1 of 1

A dihydrogen phosphate selective anion receptor based on acylhydrazone and pyrazole
(2015-01-01)
Pandian, Thiravidamani Senthil
;
Choi, Yusun
;
Srinivasadesikan, Venkatesan
;
Lin, Ming-Chang
;
Kang, Jongmin
A novel chromogenic anion receptor 1 based on acylhydrazone and pyrazole has been designed and synthesized. Chromogenic anion receptor 1 forms stable 1:1 complexes with dihydrogen phosphate (H2PO4-) and other halide (Cl-, Br-) anions in DMSO solution, as shown by UV-vis, fluorescence and H-1 NMR spectroscopic experiments. The pyrazole containing host 1 in the optimized geometry of the complex has been noted as planar. The planarity of the host with the H2PO4- anion resulted from four strong N-H center dot center dot center dot O and two weak C-H center dot center dot center dot O types of H-bonding. In total six H-bonding and the planarity of the host in the complex are responsible for the high binding energy. The addition of an excess of more basic anions (F- and CH3COO-) induces stepwise deprotonation, an event signalled by the appearance of a bright yellow color. The intensity of the fluorescence spectrum increases when hydrogen bonding occurs and decreases when deprotonation occurs, which is evidenced by fluorescence titrations.