Crystal Structure, Spectral and Thermal Properties of 2-Aminopyridinium Adipate Monoadipic Acid Dihydrate

Abstract

In the title complex, C<inf>22</inf>H<inf>36</inf>N<inf>4</inf>O<inf>10</inf>, cyclic eight-membered hydrogen bonded rings exist involving 2-aminopyridinium and adipate ions. Adipic acid molecules and adipate ions are linked in zigzag chains by O-H⋯O hydrogen bonds. The characteristic IR absorption bands of 2-aminopyridinium adipate monoadipic acid dihydrate were observed as; 3500-2500 cm-1 region (hydrogen bonded O-H and N-H stretch), 1695 cm-1 (carboxylic C=O stretch), 1595 cm-1 (C=N ring stretching and N-H bending vibrations), 1565 and 1395 cm-1 (asymmetrical and symmetrical stretch of carboxylate ion, respectively). The title complex showed two thermal decomposition steps. Crystallization water release in the first step (105-118 °C) and remaining anhydrous complex decomposition completely in the second step (120-450 °C). © 2003 Elsevier Science B.V. All rights reserved.