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Figure 8
Hydrogen bonding involving the carbonate anion. (a) Carbonate `binding' by five guanidinium and four water hydrogen bonds, with estimated dissociation energies in kJ mol−1. (b) Observed correlation between hydrogen-bond energies and H⋯O contact distances; red points are from our experiment and the green line is from the work by Espinosa et al. (1998BB11).

IUCrJ
Volume 6| Part 1| January 2019| Pages 56-65
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518014616