Abstract
The structure of the title compound, C6H18N3 center dot HPO4 center dot H2PO4, is characterized by two kinds of inorganic chains running along the a-axis direction. The first one is composed of HPO42- anions, while the second one is built up by H2PO4- anions. Both types of chains are held together by O-H center dot center dot center dot O hydrogen bonds. The organic cations are attached to these chains through N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds. The piperazin-1,4-diium ring adopts a chair conformation.