Abstract
The asymmetric unit of the title salt, C6H9ClN22+.2H2PO4(-), contains two dihydrogenphosphate anions and one 2-chlorobenzene-1,4-diaminium dication. The H2PO4(-) anions are interconnected through strong O-H center dot center dot center dot O hydrogen bonds to form two-dimensional infinite layers parallel to ( 001). The organic entities are anchored to the inorganic layers through N-H center dot center dot center dot O hydrogen bonds, and through weak C-Cl center dot center dot center dot O halogen bonds [ 3.159 ( 2) A angstrom, 140.48 ( 7)degrees]. No pi-pi stacking interactions between neighboring aromatic rings or C-H center dot center dot center dot pi interactions towards them are observed. Minor disorder is observed for the Cl atom and one hydroxy group [minorcomponent occupancy = 3.29 (9)%].