The crystal structure of 2-aminophenylammonium dihydrogenphosphate, C6H9N2. H2PO4-, consists Of layers built up from H2PO4- tetrahedra alternating wi
th monoprotonated orthophenylenediamine molecules. Two types of hydrogen bo
nd, O-H ... O and N-H ... O, ensure the cohesion and stability of the struc
ture.