ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 9, Number 4
JKCSEZ 9(4)
August 20, 1965 

p-Phenylenediamine dihydrobromide and p-phenylenediamine dihydrochloride are found to be isomorphous. p-Phenylenediamine dihydrobromide is triclinic with lattice parameters, a = 4.52±0.02Å, b = 6.13±0.02Å, c = 8.88±0.03Å, α = 111±1°, β = 97±1°, γ = 101±1°. It belongs to space group P1- and there is one molecule in the unit cell. The crystal structure is determined according to the method of Fourier synthesis from the electron density projections in three principal crystallographic axes. The crystal structure, thus determined is refined by the method of two-dimensional difference Fourier synthesis.