IN THE TITLE COMPOUND (SYSTEMATIC NAME 1,3,7-trimethyl-2,6-dioxo-7H-purin-9-ium hydrogen sulfate monohydrate), C(8)H(11)N(4)O(2) (+)·HSO(4) (-)·H(2)O, the crystal packing is stabilized through N-H⋯O and O-H⋯O hydrogen bonds.

The title compound, 2C5H7N5(2+)·2HSO4(-)·SO4(2-), was synthesized from adenine and sulfuric acid. The asymmetric unit contains two diprotonated adeninium cations, two bis-ulfate anions and one sulfate anion. The crystal structure is stabilized by classical N-H⋯O and O-H⋯O hydrogen bonds, and weak C-H⋯O and C-H⋯N hydrogen bonds, generating a three-dimensional network.

In the title compound, C(10)H(11)N(2) (+)·HSO(4) (-)·2H(2)O, the asymmetric unit contains two protonated 4-amino-quinoline cations and two hydrogen sulfate anions with four water mol-ecules. The crystal structure involves extensive N-H⋯O and O-H⋯O hydrogen bonding.

The title compound, 2C(17)H(13)F(3)N(3)O(+)·SO(4) (2-)·2H(2)O, crystallizes with four independent cations (A, B, C and D) in the asymmetric unit, which is composed of two groups of two cations, one anion and two water mol-ecules (Z' = 2). The dihedral angle between the mean planes of the 4-hydroxy-phenyl and quinolinium groups is 8.9 (7)° in A, 30.1 (6)° in B, 28.8 (8)° in C and 12.8 (1)° in D....

The title complex, [Cu(SO4)(C13H13N3)(H2O)]·4H2O, was obtained by mixing copper sulfate penta-hydrate and 2-(pyridin-2-yl)-N-(pyridin-2-yl-methyl-idene)ethanamine in eth-anol under reflux conditions. The Cu(II) ion shows a Jahn-Teller-distorted octa-hedral geometry, with equatorial positions occupied by three N atoms from the tridentate ligand (average Cu-N = 2.004 Å) and one O atom from a bide...

In the asymmetric unit of the title hydrated salt, 2C6H6N3 (+)·SO4 (2-)·2H2O, there are two independent sulfate ions, one lying on a twofold axis, and the other in a general position. There are three independent benzotriazolium cations and three independent water mol-ecules. The sulfate ion in a general position forms hydrogen-bonded chains of stoichiometry SO4 (2-)·3H2O in the b-axis direction...

in this research, we have developed cheap recyclable and task-specific acidic ionic liquids (ails) 1-hydrogen-3-methylimidazolium hydrogen sulfate [hmim]hso4, 1-hydrogen-3-methylimidazolium chloride [hmim]cl, 2-pyrrolidonium hydrogensulfate [hnhp]hso4 and applied them in acid catalyzed synthesis of quinoxaline derivatives from 1,2-phenylendiamines and 1,2-dicarbonyl compounds. the products coul...

In the mol-ecule of the title compound, 2C(4)H(10)N(3)O(2) (+)·SO(4) (-), the cations are planar (r.m.s. deviations = 0.0144 and 0.0236 Å) and oriented at a dihedral angle of 62.30 (4)°. Intra-molecular N-H⋯O hydrogen bonds result in the formation of two planar six-membered rings. The cations are linked to the sulfate ion through inter-molecular C-H⋯O and N-H⋯O hydrogen bonds, forming an R(2) (...