Hydrated (pyrazinecarbonyl)hydrazones of hydroxy and methoxy substituted benzaldehydes

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Abstract

The crystal structures of hydrates of five substituted benzaldehyde (pyrazinecarbonyl)hydrazone derivatives [N₂C₄H₃CONHN=CHC₆H_5-nX_n · m H₂O: m = 1, n = 1, X = 3-HO; m = 1, n = 2, X₂ = 2,5-(HO)₂; m = 1, n = 2, X₂ = 2,4-(MeO)₂; m = 2.5, n = 2, X₂ = 3,4-(MeO)₂; m = 3, n = 1, X = 4-HO] are reported. In all cases the water molecules participate in strong hydrogen-bonds extending and partially replacing the weak intermolecular C–HX (X = O, N or π-ring) hydrogen-bonding and π · · · π interactions normally present in anhydrous structures of compounds of this type.

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Keywords: (Pyrazinecarbonyl)hydrazone; Hydrates; Hydrogen bonds Document Type: Research Article DOI: http://dx.doi.org/10.1524/zkri.2010.1267 Publication date: 26 de Agosto de 2010