Hydration structure of pyridine molecule studied by neutron diffraction with isotopic substitution method

► Neutron diffraction measurements on aqueous pyridine solutions were carried out. ► 14N/15N and H/D isotopic substitution methods were applied. ► Difference functions, ΔNinter(Q) and ΔHinter(Q), were successfully derived. ► Hydration structure around pyridine-N and pyridine-H atoms was discussed.