( m -Phenylenedimethylene)diammonium p -nitrophenylphosphate perchlorate

The title compound, C8H14N22+·C12H8N2O8P−·ClO4−, was formed by the reaction of α,α-bis-m-xylenediamine and sodium bis-p-nitrophenylphosphate in the presence of Zn(ClO4)·6H2O in methanol solution. The two amine groups of the m-xylenediammonium ion are each protonated and each hydrogen-bonded to two O atoms of the phosphate anion, which acts as a 1,3-bridge. The ammonium groups are arranged matched face to face and each pair is doubly bridged by two perchlorate ions through hydrogen bonding. In addition, there are also weak C-H...O interactions. Both the N-H...O and C-H...O interactions are contained in a channel down the a axis. The perchlorate oxygen atoms are disordered over two positions with site occupancy factors of ca 0.7 and 0.3.