Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 595, Issue 1-3, Pages 29-37Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-2860(01)00489-6
Keywords
3,5-dinitrosalicylic acid; urotropine; dicyclohexylamine; hydrogen bonds; proton polarizability; crystal structure; FT-IR spectroscopy; NMR spectroscopy; theoretical calculations
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In the reaction between 3,5-dinitrosalicylic acid and urotropine, the proton of the phenolic group is transferred to a nitrogen atom of urotropine to form a hydrogen-bonded ion-paired [N...O-phenolate = 2.777(4) Angstrom] compound. An analogous reaction between the acid and dicyclohexylamine yields a centrosymmetric ion-paired dimer [N...O-phenolate = 2.864(4), N...O-carbonyl = 2.940(5) Angstrom]. The structures of the two compounds are discussed in relation to their infrared spectral features. The structure of the anion is also investigated theoretically by geometry-optimization calculations. (C) 2001 Elsevier Science B.V. All rights reserved.
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