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Three isomeric planar pyridine–urea based receptors namely 2L (ortho), 3L (meta) and 4L (para) have been synthesized by Schiff base condensation reaction. All the receptors are decorated with suitable anion binding urea moieties. Pyridine acts as a protonation site, also serves for electrostatic stabilization for anions. Three isomeric receptors on treatment with inorganic acid generate isostructural/non-isostructural...
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