In the crystal structure of the title compound, C(7)H(6)N(3)O(2) (+)·H(2)PO(4) (-)·C(7)H(5)N(3)O(2)·2H(2)O, the components are connected through O-H⋯O, N-H⋯O and O-H⋯N hydrogen-bonding inter-actions, forming a sheet-like structure parallel to (101). Adjacent sheets are further linked together by strong O-H⋯O hydrogen-bonds involving the dihydrogenphosphate groups. π-π stacking inter-actions bet...

O. Martı́nez Matos, G. A. Torchia, G. M. Bilmes, and J. O. Tocho Centro de Investigaciones Ópticas-CIOp(CONICET CIC), CC 124, 1900 La Plata, Argentina Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, 1900 La Plata, Argentina Facultad de Ingenierı́a, Universidad Nacional de La Plata, 1 y 47, 1900 La Plata, Argentina ~Received 27 June 2003; revised manuscript received 13 Fe...

In this study, after specifying theoretical reaction conditions required for the chemical reaction, potassium pentaborate (KB5) was synthesized from dihydrogen phosphate ( $${\text{KH}}_{2} {\text{PO}}_{4}$$ ) solution and raw colemanite $${\text{Ca}}_{2} {\text{B}}_{6} {\text{O}}_{{11}} \cdot 5{\text{H}}_{2} {\text{O}}$$ ore. The slow evaporation method used at 25 °C. effect of time (6–18 h) o...