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Overview of typical potential energy profiles: (a) standard H-bonds (asymmetric double-well), typically with an Odonor–Oacceptor distance greater than 2.6 Å; (b) LBHB, typically with an Odonor–Oacceptor distance of 2.5–2.6 Å and (c) single-well (ionic) H-bonds, typically with an Odonor–Oacceptor distance of less than 2.5 Å [8]. The corresponding O–N distances are generally greater than O–O distances.
