4-(Carboxy­meth­yl)anilinium chloride

In the crystal of the title compound, C8H10NO2 +·Cl−, alternating layers of hydro­phobic and hydro­philic zones stack along the c axis. The chloride anions are sandwiched between the 4-(carboxy­meth­yl)anilinium layers, forming inter­molecular O—H⋯Cl and N—H⋯Cl hydrogen bonds with the ammonium and carboxyl groups of the cations. In addition, inter­molecular N—H⋯O and weak C—H⋯O and C—H⋯Cl hydrogen bonds help stabilize the crystal structure

2-Amino-3-carb­oxy­pyridinium nitrate

In the crystal structure of the title compound, C6H7N2O2 +·NO3 −, the cations are linked via C—H⋯O hydrogen bonds, forming infinite chains running along the b axis. These chains are further linked through N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds to the nitrate anions, forming well-separated infinite planar layers parallel to (001)

Bis(3-hy­droxy­methyl­anilinium) hexa­chloridostannate(IV)

In the title compound, (C7H10NO)2[SnCl6], the SnIV atom, located on an inversion center, exists in an octa­hedral coordination environment. The crystal structure exhibits alternating organic and inorganic layers parallel to (01). The cations and anions are linked via inter­molecular N—H⋯O, N—H⋯Cl and O—H⋯Cl hydrogen bonds. Additional stabilization is provided by π–π stacking inter­actions between the benzene rings of the cations [centroid–centroid distances = 3.6962 (15) and 3.9340 (15) Å]

Tris(2-{[2-(4-meth­oxy­phen­yl)eth­yl]imino­meth­yl}phenolato-κ2 N,O 1)cobalt(III)

In the title compound, [Co(C16H16NO2)3], the CoIII atom is six-coordinated in an irregular octa­hedral geometry by three N,O-chelating 2-{[2-(4-meth­oxy­phen­yl)eth­yl]imino­meth­yl}phenolate groups. One of the three meth­oxy group is disordered over two sets of sites with an occupancy ratio of 0.768 (5):0.232 (5). The crystal packing can be described by alternating zigzag layers of organic ligands and CoN3O3 octa­hedra along the c axis. There are no classical hydrogen bonds in the structure, but C—H⋯π inter­actions occur

2-Amino-3-carb­oxy­pyrazin-1-ium perchlorate bis­(2-amino­pyrazin-1-ium-3-carboxyl­ate) monohydrate

The asymmetric unit of the title compound, C5H6N3O2 +·ClO4 −·2C5H5N3O2·H2O, comprises two symmetry-independent zwitterions, one cation, one perchlorate anion and one water mol­ecule. In the crystal, the three different types of organic entities are linked by N—H⋯O and N—H⋯N hydrogen bonds, forming undulating sheets parallel to (1-10). These sheets are in turn connected by O—H⋯N and O—H⋯O hydrogen bonds involving perchlorate anions and water mol­ecules, forming a three-dimensional network. Intra­molecular N—H⋯O and weak inter­molecular C—H⋯O hydrogen bonds are also present

2-Amino-3-carb­oxy­pyrazin-1-ium nitrate monohydrate

In crystal structure of the title compound, C5H6N3O2 +·NO3 −·H2O, inter­molecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds link the cations, anions and water mol­ecules into ribbons extending in [10]. Weak inter­molecular C—H⋯O hydrogen bonds further link these ribbons into sheets parallel to ( 3)

Bis(cytosinium) aqua­penta­chlorido­indate(III)

The asymmetric unit of the title compound, (C4H6N3O)2[InCl5(H2O)], comprises two independent cytosinium cations and an aquapentachloridoindate anion. The InIII ion is in a slightly distorted octa­hedral coordination geometry. In the crystal, alternating layers of cations and anions are arranged along [010] and are linked via inter­molecular N—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen bonds, forming sheets parallel to (001). Additional stabilization within these sheeets is provided by weak inter­molecular C—H⋯O inter­actions

Tris(piperazine-1,4-diium) bis­[hexa­chloridoindate(III)] tetra­hydrate

The asymmetric unit of the title compound, (C4H12N2)3[InCl6]2·4H2O, consists of one and half independent piperazinium cations, an hexa­chloridoindate anion and two mol­ecules of water. The InIII ion is six-coordinated and forms a quasi-regular octa­hedral arrangement. In the crystal, alternating layers of cations and anions are arranged parallel to (10) and are linked with the water mol­ecules via intra- and inter­molecular N—H⋯O, O—H⋯Cl, C—H⋯O and N—H⋯Cl hydrogen bonds, forming a complex three-dimensional network. Additional stabilization within the layers is provided by weak inter­molecular C—H⋯Cl inter­actions

Bis(5-amino-3-carb­oxy-1H-1,2,4-triazol-4-ium) sulfate dihydrate

The crystal structure of the title compound, 2C3H5N4O2 +·SO4 2−·2H2O, displays a three-dimensional framework in which mixed infinite chains [oriented parallel to (510) and (10)] inter­fere, forming tunnels extending parallel to the c axis. Inter­molecular O—H⋯O, N—H⋯O and O—H⋯N hydrogen bonds ensure the unity of the structure and generate centrosymmetric R 4 4(14) and R 4 2(8) rings. The S atom lies on a twofold axis

2-[({2-[(2-Hy­droxy-5-meth­oxy­benzyl­idene)amino]­eth­yl}imino)­meth­yl]-4-meth­oxy­phenol

The asymmetric unit of the title compound, C18H20N2O4, contains one-half mol­ecule with an inversion center located at the centroid of the mol­ecule. In the crystal, mol­ecules are linked by C—H⋯π inter­actions, forming layers parallel to (101). An intra­molecular O—H⋯N hydrogen bond also occurs