The small but hardly significant differences can be attributed to electronic effects, mainly of the functional group bound to C4, as well as to different packing environments in the three compounds.
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4-Methoxypicolinic Acid <i>N</i>-Oxide: One of the Shortest Hydrogen Bonds Known Characterized by Neutron Diffraction, Inelastic Neutron Scattering, Infrared Spectroscopy, and Periodic DFT Calculations.
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