ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 9, Number 3
JKCSEZ 9(3)
June 20, 1965 

Hydrazonium diphosphate crystallizes with the space-group symmetry P21/C. There are two formular units of N2H6H4(PO4)2 in the unit cell, for which a = 4.52±0.02, b = 8.06±0.03, c = 10.74±0.03Å and β = 100±0.5°. The determination of the crystal structure was carried out by means of Patterson, Fourier and difference syntheses. The phosphate group has configuration of nearly regular tetrahedron with the mean P-O distance of 1.55Å. The N-N distance found is 1.40Å, which corresponds to previously reported values for the N2H6++ ion in N2H6SO4. A molecule has a transform with a center of symmetry in it. Each nitrogen atom forms three hydrogen bonds with the N…O distances 2.62, 2.79 and 2.89Å. And a O…O hydrogen bond between different phosphate groups is found with the distance 2.63Å. The structure is held together by three-dimensional network of the strong hydrogen bonds.