Crystal structure of iproniazid phosphate

Abstract

The crystal structure of the monoamine oxidase inhibitor iproniazid phosphate (N′-isopropylpyridine-4-carbohydrazinium phosphate), C₉H₁₄N₃O⁺H₂PO₄^–, has been determined by X-ray diffraction techniques. The colourless crystals are triclinic with space group P and cell dimensions of a= 9·063, b= 10·084, c= 7·883 Å, α= 94·02, β= 98·84, and γ= 116·67° with Z= 2. The structure was determined by Patterson and Fourier methods. The refinement by least-squares methods converged to an R of 0·089 for the 1958 observed reflections measured on a diffractometer by the stationary crystal–stationary counter technique. The crystal consists of an iproniazid cation and H₂PO₄^– anions held together by hydrogen bonds.