Syntheses,characterization and crystal structures of two structurally similar Schiff bases isonicotinic acid [1-(3-methoxy-2-hydroxyphenyl)methylidene]hydrazide and isonicotinic acid [1-(4-dimethylaminophenyl)methylidene]hydrazide monohydrate |
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Authors: | De-Suo Yang |
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Institution: | (1) Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji, 721007, People’s Republic of China |
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Abstract: | The Schiff base compounds, isonicotinic acid 1-(3-methoxy-2-hydroxyphenyl) methylidene]hydrazide (C14H13N3O3, 1) and isonicotinic acid 1-(4-dimethylaminophenyl) methylidene]hydrazide monohydrate (C15H16N4O·H2O, 2) have been synthesized by the condensation of equimolar 3-methoxysalicylaldehyde or 4-dimethylaminobenzaldehyde with isonicotinic
acid hydrazide in MeOH or EtOH. The compounds were characterized by elemental analysis, IR, 1HNMR spectra, and single crystal X-ray diffractions. Compound 1 crystallizes in the monoclinic space group P-1 with unit cell dimensions a = 7.662(1) ?, b = 16.249(2) , c = 10.874(2) ?, β = 110.426(3)°, V = 1268.7(3) ′3, Z = 4, R
1 = 0.0644, and wR
2 = 0.1283. Compound 2 crystallizes in the orthorhombic space group P212121 with unit cell dimensions a = 7.388(1) ?, b = 11.812(1) ?, c = 17.197(2) ?, V = 1500.7(2) ′3, Z = 4, R
1 = 0.0585, and wR
2 = 0.1143. X-ray structure determinations revealed that the molecules of both compounds display trans configurations with respect to the C=N double bonds. In the crystal structure of 1, molecules are linked through N–H···N intermolecular hydrogen bonds, forming layers parallel to the bc plane, while in the crystal structure of 2, molecules are linked through N–H···O, O–H···O, and O–H···N intermolecular hydrogen bonds, forming a network.
Supplementary material CCDC-615072 and 620235 contain the supplementary crystallographic data for this paper. These data can be obtained free of
charge at http://www.ccdccam. ac.uk/const/retrieving.html or from the Cambridge Crystallographic Data Centre (CCDC), 12 Union
Road, Cambridge CB2 1EZ, UK; fax: +44(0)1223–336033 or e-mail: deposit@ccdc.cam.ac.uk. |
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Keywords: | Schiff base synthesis crystal structure hydrogen bonds |
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