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1 results

  • Crystal structure of (E)-doxepin hydrochloride, C19H22NOCl

  • Jerry Hong, Joseph T. Golab, James A. Kaduk, Amy M. Gindhart, Thomas N. Blanton
  • Journal:
    Powder Diffraction / Volume 36 / Issue 1 / March 2021
    Published online by Cambridge University Press:
    09 February 2021, pp. 43-49

  • The crystal structure of (E)-doxepin hydrochloride has been solved and refined using synchrotron X-ray powder diffraction data, and optimized using density functional techniques. (E)-doxepin hydrochloride crystallizes in space group P21/a (#14) with a = 13.78488(7), b = 8.96141(7), c = 14.30886(9) Å, β = 96.5409(5)°, V = 1756.097(12) Å3, and Z = 4. There is a strong discrete hydrogen bond between the protonated nitrogen atom and the chloride anion. There are six C–H⋯Cl hydrogen bonds between the methyl groups and the chloride, as well as additional hydrogen bonds from methylene groups and the vinyl proton. The hydrogen bonds are important in determining the solid-state conformation of the cation. The compound is essentially isostructural to amitriptyline hydrochloride. The powder pattern is included in the Powder Diffraction File™ as entry 00-066-1613.