Structural study of benzidamine salicylate in the solid state and in solution

The vibrational (IR and Raman) and 1H and 13C NMR spectra of the analgesic and anti-inflammatory benzidamine salicylate (Benzasal) have been examined, and the results are described. The crystal structure of this compound has been determined by X-ray diffraction. To assist in interpretation of the sp...

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Bibliographic Details
Published inJournal of pharmaceutical sciences Vol. 81; no. 1; p. 94
Main Authors Galvez, E, Fernandez-Sanchez, C, Sanz-Aparicio, J, Florencio, F, Fernandez-Navarro, E, Bellanato, J
Format Journal Article
LanguageEnglish
Published United States 01.01.1992
Subjects
Anti-Inflammatory Agents
Anti-Inflammatory Agents, Non-Steroidal - chemistry
Benzydamine - chemistry
Calorimetry, Differential Scanning
Magnetic Resonance Spectroscopy
Molecular Structure
Spectrophotometry, Infrared
X-Ray Diffraction
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Summary:The vibrational (IR and Raman) and 1H and 13C NMR spectra of the analgesic and anti-inflammatory benzidamine salicylate (Benzasal) have been examined, and the results are described. The crystal structure of this compound has been determined by X-ray diffraction. To assist in interpretation of the spectroscopic data, some measurements of benzidamine, benzidamine hydrochloride, and salicylic acid have also been made. The most important intermolecular interactions of benzidamine salicylate in the solid state are N(+)H...O(-)...-C hydrogen bonds involving both salicylate oxygen atoms (d = 2.658 A and 3.228 A). At least the stronger hydrogen bond remains in CDCl3 solution. Moreover, the strong intramolecular hydrogen bond O-H...O(-)...-C within the salicylate anion has also been observed in the solid state and in solution.
ISSN:0022-3549
DOI:10.1002/jps.2600810119