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Inclusion of 1,8-octanediphosphonic acid in cucurbit[7]uril: a combined solid state and solution study

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Abstract

The inclusion of 1,8-octanediphosphonic acid (OA) in cucurbit[7]uril (Q[7]) has been investigated via a combined solid state and solution study. The reaction of OA and Q[7] in water led to the formation of a 1:1 inclusion compound 1 as a white crystalline material. Synchrotron single crystal X-ray diffraction revealed its detailed structure validated by Raman spectroscopy with featured vibrational modes from both organic molecules. Subsequent 1H solution NMR data supported the formation of a 1:1 inclusion complex in aqueous solution. The changes in NMR chemical shifts are consistent with the solid-state orientation in which the phosphonic acid groups of OA are oriented externally to the carbonyl portals and the intervening alkyl chain lies within the cavity of Q[7]. However, the solution study also inferred possible formations of other complexes in solution. This work highlighted the advantage of combining solid state and solution studies to reveal the detailed molecular interactions involving complex inclusion phenomena.

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Acknowledgements

Synthesis and characterization of materials were carried out in the facilities under Nuclear Science and Technology (NST) at ANSTO. The crystallographic data for compound 1 were collected on the MX2 beamline at the Australian Synchrotron, a part of ANSTO, and made use of the Australian Cancer Research Foundation (ACRF) detector.

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  1. Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, Sydney, NSW, 2232, Australia

    Marina Cagnes, Inna Karatchevtseva, Alexander Angeloski & Yingjie Zhang

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  1. Marina Cagnes
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  2. Inna Karatchevtseva
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  3. Alexander Angeloski
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Contributions

M.C. performed synthesis and solution NMR; I.K. did Raman measurement; A. A. performed NOESY NMR experiment; Y.Z. collected single crystal data and did structure refinement; all authors contributed to the paper writing and editing.

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Correspondence to Yingjie Zhang.

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Cagnes, M., Karatchevtseva, I., Angeloski, A. et al. Inclusion of 1,8-octanediphosphonic acid in cucurbit[7]uril: a combined solid state and solution study. J Incl Phenom Macrocycl Chem 104, 149–159 (2024). https://doi.org/10.1007/s10847-024-01227-3

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