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New salts containing cations of selected pyridine derivatives of the composition [pyH]NO 3 , where py is 2-pyridylmethanol (2-(hydroxymethyl)pyridine, 2pm), 3-pyridylmethanol (3-(hydroxymethyl) pyridine, 3pm), isonicotinamide (4-(aminocarbonyl)-pyridine, inia) and thionicotinamide (4- (aminothiocarbonyl)pyridine, tnia) were synthesised using two methods. By the first method, the above salts were obtained from reaction mixtures prepared from Fe(NO 3 ) 3  ·9H 2 O and the appropriate pyridine derivative py in ethanol without the addition of acids. The protons required for protonation of the given pyridine derivatives are formed by the protolytic reaction of [Fe(H 2 O) 6 ] 3+ , which acts as a cationic Brønstedt acid. These cations are present in the solid state of Fe(NO 3 ) 3  · 9H 2 O as well as in its solutions. Under the second procedure, the salts were prepared by a direct reaction of the selected pyridine derivative py with a diluted solution of HNO 3 . The first method affords crystals with lower yields but the second method produces microcrystals with higher yields. All the compounds were characterised by elemental analysis, infrared and NMR spectroscopic analyses and [3pmH]NO 3  and [2pmH]NO 3  by X-ray structure analysis also. [3pmH]NO 3  crystallises in the monoclinic and [2pmH]NO3 in the triclinic system.

Syntheses, structures and properties of isonicotinamidium, thionicotinamidium, 2- and 3-(hydroxymethyl)pyridinium nitrates