In the crystal structure of the title compound, C(6)H(6)N(3) (+)·C(6)H(2)N(3)O(7) (-), anions and cations are linked into chains along [010] by inter-molecular N-H⋯O hydrogen bonds. These chains are further stabilized by weak C-H⋯O hydrogen bonds and π-π stacking inter-actions with a centroid-centroid distance of 3.908 (1) Å.

THE TITLE COMPOUND [SYSTEMATIC NAME: 4-(2,2-diphenyl-2-prop-oxyacet-oxy)-1-methyl-piperidin-1-ium picrate], C(23)H(30)NO(3) (+)·C(6)H(2)N(3)O(7) (-), crystallizes as a salt with one cation-anion (propiverinium picrate) pair in the asymmetric unit. A significant number of conformational changes are observed between the crystalline environment of this cation-anion salt and that of a density funct...

The title compound {systematic name: [1-(carboxy-meth-yl)cyclo-hexyl]methanaminium 2,4,6-trinitro-phenolate}, C(9)H(18)NO(2) (+)·C(6)H(2)N(3)O(7) (-), was synthesized from picric acid and gabapentin. The crystal packing is stabilized by intra-molecular N-H⋯O=N and N-H⋯O-Ph hydrogen bonds. An O-H⋯O inter-action is also present.

There is one cation-anion pair in the asymmetric unit of the title compound [systematic name: 4-(3-carb-oxy-6-fluoro-4-oxo-1,4-dihydroquinolin-7-yl)-1-ethyl-piperazin-1-ium 2,4,6-tri-nitro-phenolate], C(19)H(23)FN(3)O(3) (+)·C(6)H(2)N(3)O(7) (-). The six-membered piperazine group in the cation adopts a slightly distorted chair conformation and contains a protonated N atom. The dihedral angles b...

IN THE CATION OF THE TITLE COMPOUND [SYSTEMATIC NAME: (RS)-4-(3-carb-oxy-1-ethyl-6,8-difluoro-4-oxo-1,4-dihydro-quinolin-7-yl)-2-methyl-piperazin-1-ium 2,4,6-trinitro-phenolate], C(17)H(20)F(2)N(3)O(3) (+)·C(6)H(2)N(3)O(7) (-), the piper-azine ring adopts a slightly distorted chair conformation and contains a protonated N atom. An intra-molecular O-H⋯O hydrogen bond occurs in the cation. The di...

The title compound, C(13)H(13)F(2)N(6)O(+)·C(6)H(2)N(3)O(7) (-), is the first structurally characterized salt of the cation of fluconazole [systematic name 2-(2,4-difluorophenyl)-1,3-bis(1H-1,2,4-triazol-1-yl)propan-2-ol], a synthetic anti-fungal agent. In the crystal, the components are linked by O-H⋯O hydrogen bonding between the hy-droxy group of the fluconazolium cation and the C=O(-) group...

We describe a new kinetic method for potentiometric determination of creatinine in serum, based on the creatinine--picrate reaction in alkaline medium (Jaffé reaction). The reaction is monitored with a picrate-selective electrode, and the increase in electrode potential during 270 s is measured and related directly to the creatinine concentration. Small cation-exchange columns are used to separ...

In the crystal structure of the title compound, C(6)H(13)N(2)O(+)·C(6)H(2)N(3)O(7) (-), the anions and cations are linked by O-H⋯O, C-H⋯O and C-H⋯N hydrogen bonds into a three-dimensional network. The O atoms of a nitro group of the picrate anion are disordered over two positions of equal occupancy.