期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1062, 期 -, 页码 110-115出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2014.01.023
关键词
Amino acids; X-ray structure; Schiff base; Resorcinol; Hydrogen bond
资金
- European Rural Development Fund
- Spanish Ministry of Education and Science [CTQ2010-19386/BQU]
Three Schiff bases derived from of 2,4-dihydroxybenzaldehyde or 2,4-dihydroxyacetophenone and esters of tyrosine and histidine have been synthesized and the crystal and molecular structures determined by single crystal X-ray diffraction. The molecular structures of the three compounds are dominated by short intramolecular hydrogen bonds with distances N center dot center dot center dot O ranging from 2.536(2) to 2.588(2) angstrom and the hydrogen atom is bonded to the nitrogen. In the solid state, the structures are characterized by the keto-amine tautomer, whereas in the solution the phenol-imine form was detected by H-1 NMR spectroscopy. Intermolecular interactions influencing crystal packing are discussed. (C) 2014 Elsevier B.V. All rights reserved.
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