Hydrogen bonding in 1-carb­oxy­propanaminium nitrate

There are two crystallographically independent cations and two anions in the asymmetric unit of the title compound, C4H5NO2 +·NO3 −. In the crystal, the 1-carb­oxy­propanaminium cations and nitrate anions are linked to each other through strong N—H⋯O and O—H⋯O hydrogen bonds, forming a three-dimensional complex network. C—H⋯O inter­actions also occur

Cytosinium–hydrogen maleate–cytosine (1/1/1)

The title organic salt, C4H6N3O+·C4H3O4 −·C4H5N3O, was synthesized from cytosine base and maleic acid. An intra­molecular O—H⋯O hydrogen bond occurs in the hydrogen maleate anion. The crystal packing is stabilized by inter­molecular N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds, giving rise to a nearly planar two-dimensional network parallel to (101)

4-Methyl­anilinium nitrate

The asymmetric unit of the title compound, C7H10N+·NO3 −, consists of a 4-methyl­anilinium cation protonated at the amino group and a nitrate anion. In the crystal, anions and cations are linked through N—H⋯O and N—H⋯(O,O) hydrogen bonds, buiding a corrugated layer structure parallel to (001)

Hydrogen bonding in cytosinium dihydrogen phosphite

In the title compound, C4H8N3O4P+·H2PO3 −, the cytosine mol­ecule is monoprotonated and the phospho­ric acid is in the monoionized state. Strong hydrogen bonds, dominated by N—H⋯O inter­actions, are responsible for cohesion between the organic and inorganic layers and maintain the stability of this structure

trans-Diaqua­bis­(dl-valinato-κ2 N,O)nickel(II)

In the title complex, [Ni(C5H9NO2)2(H2O)2], the NiII atom, located on a centre of inversion, is trans-coordinated by two O atoms and two N atoms from d-bidentate valine and l-bidentate valine ligands and two water O atoms in an octa­hedral geometry. In the crystal, the discrete mononuclear units are linked into a three-dimensional network via O—H⋯O and N—H⋯O hydrogen bonds. C—H⋯O inter­actions are also observed

Anilinium hydrogen sulfate

The asymmetric unit of the title compound, C6H8N+·HSO4 −, contains two cations and two anions which are linked to each other through N—H⋯O hydrogen bonds, formed by all H atoms covalently bonded to the N atoms. In addition, strong O—H⋯O anion–anion hydrogen-bond inter­actions are also observed

(4S)-4-Benzyl-N-{[(4S)-4-benzyl-2-oxo-1,3-oxazolidin-3-yl]sulfon­yl}-2-oxo-1,3-oxazolidine-3-carboxamide

The title compound, C21H21N3O7S, contains an oxazolidinone ring and a sulfonamide group, both characteristic for biologically and pharrmaceutically active compounds. Both stereogenic centres reveal an S absolute configuration. The two oxazolidinone rings are in an envelope conformation with the methyl­ene carbon flap atoms deviating by 0.428 (1) and 0.364 (2) Å from the best least-square planes formed by the four other ring atoms. An intra­molecular N—H⋯O hydrogen bond contributes to the folded conformation of the mol­ecule. In the crystal, weak inter­molecular C—H⋯O inter­actions connect the mol­ecules into helices along the the twofold screw axes

Ammonium tris­(tetra­ethyl­ammonium) hexa­cosa­oxidoocta­molybdate

The structure of the title compound, NH4(C8H20N)3[Mo8O26], is built up by discrete cations and anions, with two formula units in the asymmetric unit. The β-octa­molybdate anions are linked to the ammonium cations via N—H⋯O hydrogen bonding involving terminal oxide groups and to the tetra­ethyl­ammonium cations via weak C—H⋯O inter­actions

Cytosinium hydrogen selenite

In the crystal structure of the title salt, C4H6N3O+·HSeO3−, systematic name 6-amino-2-methylidene-2,3-dihydropyrimidin-1-ium hydrogen selenite, the hydrogenselenite anions and the cytosinium cations are linked via N—H...O, N—H...Se, O—H...O, O—H··Se and C—H...O hydrogen bonds, forming a three-dimensional framework