A dinuclear copper complex with a p-amino­benzoate anion

In the title compound, bis(μ-p-aminobenzoato-κ²O:O)bis[(N,N-dimethylformamide-κO)copper(II)], [Cu₂(L)₄(DMF)₂]·2DMF (HL is p-amino­benzoic acid, C₇H₆NO₂, and DMF is N,N-dimethyl­formamide, C₃H₇NO), two Cu^II cations are bridged by four L⁻ anions to form a dinuclear complex that lies on a center of inversion. The Cu^II cation is coordinated by four carboxyl­ate O atoms from four L⁻ anions and one O atom from a DMF molecule. A free DMF molecule is present in the asymmetric unit. The L⁻ anions and the uncoordinated DMF molecules are linked through hydrogen bonds to form a one-dimensional structure along the c axis.

2,3,5,6-Tetra­methyl­pyrazinium–tri­chloro­acetate–tri­chloro­acetic acid (1/1/1)

In the title adduct, C₈H₁₃N₂⁺·C₂Cl₃O₂⁻·C₂HCl₃O₂, the tetra­methyl­pyrazine mol­ecule is protonated at one of the N atoms and linked to the tri­chloro­acetate anion via an N—H...O hydrogen bond. The tri­chloro­acetate anion is also linked to the tri­chloro­acetic acid mol­ecule via an O—H...O hydrogen bond.

Bis(triethyl­aminium) hexa­aqua­zinc(II) bis­(naphthalene-1,6-disulfonate)

The title complex, (C₆H₁₆N)₂[Zn(H₂O)₆](C₁₀H₆O₆S₂)₂, is formed by aggregation of one hexa­hydrated zinc(II) cation, two triethyl­aminium cations and two naphthalene-1,6-disulfonate dianions. The Zn^II cation is six-coordinate and located at an inversion center. The coordination around the metal ion is octa­hedral, with tetra­gonal elongation.

Bis(piperazinium) di-μ-chloro-bis­[diaqua­dichloro­manganate(II)] dichloride

The title compound, (C₄H₁₂N₂)₂[Mn₂Cl₆(H₂O)₄]Cl₂, consists of two piperazinium cations, two chloride anions and a dimanganese complex anion, which lies on a center of symmetry. Each Mn^II atom is located in a distorted octa­hedral environment. The cations and the anions are held together by O—H...Cl and N—H...Cl hydrogen bonds. The structure features the formation of inorganic and organic ionic layers, which interpenetrate each other and which are linked by hydrogen bonds.

Hexaaqua­zinc(II) bis­[trichloro­(3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione-κN⁹)zincate(II)] dihydrate

The title compound, [Zn(H₂O)₆][ZnCl₃(C₈H₁₀N₄O₂)]₂·2H₂O, consists of two disordered water mol­ecules, one hexa­hydrated Zn^II cation and two [Zn^IICl₃(caffeine)]⁻ anions, which are arranged around an inversion center. The coordination around the hexa­hydrated Zn^II cation is octa­hedral. This cation is linked with [Zn^IICl₃(caffeine)]⁻ anions and water mol­ecules via O—H...O hydrogen bonds. Moreover, O—H...O and O—H...Cl hydrogen bonds are co-operative in building up two-dimensional bilayers in which hexa­hydrated Zn^II cations are sandwiched between two layers of [Zn^IICl₃(caffeine)]⁻ anions, which are anti-parallel to each other.

2-Amino-5-methyl­pyridinium phosphate

The title compound, C₆H₉N₂⁺·H₂PO₄⁻, consists of 2-amino-5-methyl­pyridinium cations and H₂PO₄⁻ anions, which are held together by N—H...O hydrogen bonds.

Aqua­[N,N′-ethyl­enebis(o-vanillylideniminato-κ²N,O)]oxovanadium(IV) monohydrate

Reaction of a vanadyl sulfate solution with a tetra­dentate Schiff base ligand derived from the condensation of o-vanillin and ethyl­enediamine in ethanol leads to the title compound, aqua­{6,6′-dimeth­oxy-2,2′-[1,2-ethanediylbis(nitrilo­methyl­idyne)]diphenolato-κ²N,O}oxovanadium(IV) monohydrate, [V(C₁₈H₁₈N₂O₄)O(H₂O)]·H₂O, in which the V^IV atom is six-coordinated by two N atoms and four O atoms in a distorted octa­hedral configuration. In the crystal structure, mol­ecules are linked through O—H...O hydrogen bonding [O...O = 2.788 (4)–2.969 (4) Å] to form a two-dimensional network.

Matrinium tetra­chloro­ferrate(III)

The title compound, (C₁₅H₂₅N₂O)[FeCl₄], consists of one matrinium cation {matrine is (7aS,13aR,13bR,13cS)-dodeca­hydro-1H,5H,8H-dipyrido[2,1-f:3′,2′,1′-ij][1,6]-naphthyridin-10-one} and one [FeCl₄]⁻ anion. One ring of the matrinium cation has a half-chair conformation, whereas the others have chair conformations. Chiral chains of the title compound are formed by C—H...O and N—H...O hydrogen bonds.

Di-μ-chloro-bis­[aqua­(caffeine)chloro­copper(II)]

The title compound, di-μ-chloro-bis­[aqua­chloro­(3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione)copper(II)], [Cu₂Cl₄(C₈H₁₀N₃O₂)₂(H₂O)₂], has the same chemical empirical formula as another compound [Bandoli et al. (1976). Inorg. Chim. Acta, 20, 71–78]. However, the title compound is a dimer arranged around an inversion centre, whereas Bandoli's compound is a chiral polymer. In the title compound, the Cu^II atom has a distorted tetra­gonal pyramidal coordination, formed by three Cl atoms, one N atom of the caffeine ligand and one O atom of a water mol­ecule.

5,5′-Diallyl­biphenyl-2,2′-diol–1,4-diaza­bicyclo­[2.2.2]octane (2/1)

In the title compound, 2C₁₈H₁₈O₂·C₆H₁₂N₂, 5,5′-diallyl­biphenyl-2,2′-diol and 1,4-diaza­bicyclo­[2.2.2]octane mol­ecules are linked by O—H...O and O—H...N hydrogen bonds.

Dicyclo­hexyl­ammonium 1-(2-hydr­oxy-1-naphth­yl)-2-naphtholate

In the title compound, C₁₂H₂₄N⁺·C₂₀H₁₃O₂⁻, the naphtholate anions are linked via an O—H...O hydrogen bond, and are connected to the dicyclo­hexyl­ammonium cations by N—H...O hydrogen bonds.

Diethyl­enetriammonium oxonium naphthalene-1,6-disulfonate 3.5-hydrate

The title complex, C₄H₁₆N₃³⁺·H₃O⁺·2C₁₀H₆O₆S₂²⁻·3.5H₂O, comprises one diethyl­enetriammonium trication, one oxonium cation, two naphthalene-1,6-disulfonate dianions and three-and-a-half water mol­ecules. The oxonium cation donates a proton to each of three acceptors, forming strong hydrogen bonds, O—H...O [2.476 (4), 2.473 (4) and 2.503 (4) Å]. O—H...O and N—H...O hydrogen bonds link the title complex into layers parallel to the (010) plane.