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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Acknowledgements
P G gratefully acknowledges the Department of Science and Technology (DST), New Delhi, India for financial support through a Swarnajayanti Fellowship. R D acknowledges DST, India for a fellowship. B C would like to acknowledge the Council of Scientific and Industrial Research (CSIR), New Delhi, India for fellowship. X-ray crystallography is performed at the DST funded National Single Crystal X-ray Diffraction Facility in the Department of Inorganic Chemistry, IACS.
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Spectral data (1H, 13C NMR) for complex 1 and 2 are provided. Crystallographic table, selected geometric parameter and hydrogen bonding table for complex 1 and 2 are also provided. Equivalent plots of 1H-NMR titration data for L1 and L2 with C\(_{{2}}\mathrm {O}_{{4}}^{{2-}}\). The electronic supplementary information can be seen at www.ias.ac.in/chemsci.
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DUTTA, R., CHOWDHURY, B., BOSE, P. et al. Neutral tripodal receptors towards efficient trapping of oxalate. J Chem Sci 126, 1303–1309 (2014). https://doi.org/10.1007/s12039-014-0684-y
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DOI: https://doi.org/10.1007/s12039-014-0684-y