Abstract
Tris(2-aminoethyl)amine (TREN) based pentafluorophenyl urea and 4-cyanophenyl thiourea receptors have shown encapsulation of oxalate (\(\mathrm {C}_{{2}}\mathrm {O}_{{4}}^{{2-}})\) in semi-aqueous environment. A single crystal X-ray study shows trapping of planar conformer of \(\mathrm {C}_{{2}}\mathrm {O}_{{4}}^{{2-}}\) in both the cases. Further solution state binding of \(\mathrm {C}_{{2}}\mathrm {O}_{{4}}^{{2-}}\) is probed by 1H-NMR titration study in semi-aqueous solvent. Tripodal urea/thiourea receptors have shown encapsulation of planar oxalateconformer in the dimeric capsular assembly of the receptors.
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