Allosteric anion recognition by metal complexation of tris(bipyridine-imidazolium) ligand |
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| Authors: | Kiyoshi Sato Yuichi Sadamitsu Takamichi Yamagishi |
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| Institution: | a Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan
b Department of Chemistry, Tokyo Medical University, 6-1-1 Shinjyuku, Shinjyuku-ku, Tokyo 160-8402, Japan |
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| Abstract: | A new tripodal imidazolium ligand 2 comprising three 2,2′-bipyridine-imidazolium subunits connected through a mesityl spacer has been synthesized and 1:1 complexes of 2 with Fe(II) and Ru(II) ions have been prepared. 1H NMR spectroscopy including NOE analysis and molecular modeling study established that the complexes exist as a pseudocryptand type twisted structure in solution. The Fe(II) and Ru(II) complexes show strong 1:1 binding of Cl−, Br−, and I− anions in MeCN-d3 with a large enhancement of the guest selectivity (Cl− > Br− > I−) upon metal complexation. |
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| Keywords: | Anion recognition [C-H?X&minus ] hydrogen bonding Allosteric effect Pseudocryptand Imidazolium |
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