Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 5 (May 2013)


organic compounds



Acta Cryst. (2013). C69, 549-555    [ doi:10.1107/S0108270113010056 ]

Five N'-benzyl­idene-N-methyl­pyrazine-2-carbohydrazides

L. R. Gomes, J. N. Low, A. S. M. C. Rodrigues, J. L. Wardell, C. H. da S. Lima and M. V. N. de Souza

Abstract: The compounds N'-benzyl­idene-N-methyl­pyrazine-2-carbohydrazide, C13H12N4O, (IIa), N'-(2-meth­oxy­benzyl­idene)-N-methyl­pyrazine-2-carbohydrazide, C14H14N4O2, (IIb), N'-(4-cyano­benzyl­idene)-N-methyl­pyrazine-2-carbohydrazide dihydrate, C14H11N5O·2H2O, (IIc), N-methyl-N'-(2-nitro­benzyl­idene)­pyrazine-2-carbohydrazide, C13H11N5O3, (IId), and N-methyl-N'-(4-nitro­benzyl­idene)­pyrazine-2-carbohydrazide, C13H11N5O3, (IIe), have dihedral angles between the pyrazine rings and the benzene rings in the range 55-78°. These methyl­ated pyrazine-2-carbohydrazides have supra­molecular structures which are formed by weak C-H...O/N hydrogen bonds, with the exception of (IIc) which is hydrated. There are [pi]-[pi] stacking inter­actions in all five compounds. Three of these structures are compared with their nonmethyl­ated counterparts, which have dihedral angles between the pyrazine rings and the benzene rings in the range 0-6°.

Formula: C13H12N4O, C14H14N4O2, C14H11N5O·2H2O, C13H11N5O3 and C13H11N5O3


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