Crystal structure of 1,10-phenanthrolinium violurate violuric acid pentahydrate

Abstract

The title compound [systematic name: 1,10-phenanthrolinium 6-hy­droxy-5-(oxido­imino)-1,3-diazinane-2,4-dione–6-hy­droxy-5-(hy­droxy­imino)-1,3-diazin­ane-2,4-dione–water (1/1/5)], C12H9N2+·C4H2N3O4−·C4H3N3O4·5H2O, is a co-crystal salt hydrate comprising 1,10-phenanthrolinium cations, violurate anions, free violuric acid as co-former and five water mol­ecules of crystallization per formula unit. The violurate and the violuric acid residues each form distinct N—H⋯O hydrogen-bonded tapes with a common R22(8) hydrogen-bond motif extending parallel to (103). Solvent water mol­ecules connect the tapes to form a tri-periodic hydrogen-bonded network with channels extending parallel to the a-axis direction, which accommodate the N—H⋯Owater hydrogen-bonded 1,10-phenanthrolinium cations. Direct N—H⋯O hydrogen bonds between the 1,10-phenanthrolinium and violurate ions are not encountered.