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The title compound, {(C6H21N4)[V3O9]·H2O}n, crystallizes as a salt with [trenH3]3+cations [tren is tris(2-aminoethyl)amine], and one-dimensional anionic {[VVO3]−}n(metavanadate) chains along thec-axis direction. Three crystallographically distinct VVsites and one occluded water molecule are present for every [trenH3]3+cation in the unit cell. The {[VVO3]−}nchains are composed of vertex-sharing [VO4] tetrahedra and have a repeat unit of six tetrahedra. Each tetrahedron in the chain contains two terminal and two μ2-bridging oxide ligands. The [trenH3]3+cations, {[VVO3]−}nanions and occluded water molecules participate in an extensive three-dimensonal hydrogen-bonding network. The three terminal ammonium sites of the [trenH3]3+cations each form strong N—H...O hydrogen bonds to terminal oxide ligands on the {[VVO3]−}nchain. Each occluded water molecule also donates two O—H...O hydrogen bonds to the terminal oxide ligands.

In the title compound, {(NH4)[Ag(C5HN2O6)2(H2O)]} n , the Ag(I) cation is seven-coordinated and is surrounded by four oxo O atoms of the 2,3,5,6-tetra-oxo-4-nitro-pyridin-4-ide species [Ag-O = 2.3848 (19), 2.4931 (18), 2.5361 (18) and 2.573 (2) Å], two nitro O atoms [Ag-O = 2.644 (2) and 2.661 (2) Å], and one water mol-ecule [Ag-O = 2.3133 (19) Å]. The pyridin-4-ide mono-anions act as polydentate bridging ligands and form a three-dimensional network that is stabilized through O-H⋯O and N-H⋯O hydrogen bonds involving the coordinating water mol-ecule and the imide function as donator groups. The ammonium cations are located in the cavities of the framework and are also involved in hydrogen bonding to O atoms of the ligand.

In the title complex, {(C2H8N)[Cu(C8H4O4)(C8H6N3)]} n , there are two Cu(II) cations (each located on a centre of inversion), one benzene-1,2-di-carboxyl-ate dianion, one 3-(pyridin-4-yl)-1H-pyrazol-1-ide anion and one di-methyl-ammonium cation in the asymmetric unit. The di-methyl-ammonium cation was highly disordered and was treated with the SQUEEZE routine in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148-155]; the crystallographic data takes into account the presence of the cation. Each Cu(II) cation exhibits a square-planar coordination geometry. A benzene-1,2-di-carboxyl-ate dianion bridges two Cu(II) cations, building a linear chain along [001]. The chains are connected by 3-(pyridin-4-yl)-1H-pyrazol-1-ide anions, constructing a layer parallel to (101). The layers are assembled into a three-dimensional supra-molecular network through C-H⋯π inter-actions.

A binary mixture of benzyl­amine and hexa­noic acid has been reacted to form the title salt, C7H10N+·C6H11O2 −. This crystal has a 1:1 stoichiometry of acid- and amine-derived species which contrasts with other related species which can have a number of other integer ratios of acid and amine components. The diffraction data indicate complete transfer of a proton from the acid to the amine to give the salt, comprising a cation and anion combination, with the formation of three hydrogen bonds around each ammonium group. This contrasts with other related species.

The crystal structure of the title compound, NH4[In(HPO3)2], is built up from InIII cations (site symmetry 3m.) adopting an octahedral environment and two different phosphite anions (each with site symmetry 3m.) exhibiting a triangular–pyramidal geometry. Each InO6 octahedron shares its six apices with hydrogen phosphite groups. Reciprocally, each HPO3 group shares all its O atoms with three different metal cations, leading to [In(HPO3)2]− layers which propagate in the ab plane. The ammonium cation likewise has site symmetry 3m.. In the structure, the cations are located between the [In(HPO3)2]− layers of the host framework. The sheets are held together by hydrogen bonds formed between the NH4+ cations and the O atoms of the framework.

The title salt, C7H10N(+)·C7H13O2(-)·C7H14O2, is an unusual 2:1 stoichiometric combination of two carb-oxy-lic acid mol-ecules and one amine. Although there are crystal structures of a number of 1:1 complexes reported in the literature, 2:1 acid amine complexes are rather uncommon. In this case, a proton is transferred between one acid mol-ecule and the amine to give an acid anion and an ammonium cation whilst the other carb-oxy-lic acid remains protonated. The species inter-act strongly via electrostatic forces and hydrogen bonds. In addition we note that the N atom of the ammonium group makes four close contacts to surrounding O atoms. Three of these are hydrogen bonds with neighbouring acid anions while the fourth does not involve a hydrogen atom but is directed towards the carbonyl O atom of the protonated acid. Each of the acid anion O atoms accepts two hydrogen bonds from adjacent N atoms. There is also evidence of short C-H⋯O contacts. There is disorder (occupancy ratio 0.51:0.49) in the alkyl chain of one of the carb-oxy-lic acid mol-ecules.

The SnIVatom in the title compound, [(CH3)4N][Sn(C2O4)Cl3(H2O)]·H2O, obtained from the reaction between SnCl4and [(CH3)4N]2C2O4·2H2O, is six-coordinated by three Cl atoms, an O atom of a water molecule and two O atoms from an asymmetrically chelating oxalate anion. The environment around the SnIVatom is distorted octahedral. The anions are connected by the lattice water molecule through O—H...O hydrogen bonds, leading to a layered structure parallel to (010). The cations are located between these layers and besides Coulombic forces are connected to the anionic layers through weak C—H...O and C—H...Cl interactions.

The asymmetric unit of the title organotin salt, (C(8)H(20)N)[Sn(C(6)H(5))(3)(CH(4)O(3)P)(2)], contains two dibutyl-ammonium cations and two stannate(IV) anions consisting each of two monodentately bonding methyl hydrogenphosphate groups attached to an Sn(C(6)H(5)) unit. The overall coordination environment of the two Sn(IV) atoms is trigonal-bipyramidal defined by three phenyl C atoms in equatorial positions and two methyl hydrogenphosphate O atoms at the apical sites. In the crystal, the stannate(IV) anions are linked to each other via pairs of short O-H⋯O hydrogen bonds, leading to an infinite chain extending parallel to the b-axis direction. Neighbouring chains are linked by N-H⋯O hydrogen bonds involving the butyl-ammonium cations, giving a two-dimensional structure parallel to the ab plane. The crystal under investigation was found to be twinned by reticular merohedry with twin fractions of 0.5342 (7):0.4658 (7).

In the title compound, {(NH(4))(2)[Zn(C(8)H(6)O(8))]·4H(2)O}(n), the asymmetric unit contains one ammonium cation, half of a butane-1,2,3,4-tetra-carboxyl-ate anion, one Zn(2+) cation and two water mol-ecules. The butane-1,2,3,4-tetra-carboxyl-ate ligand is located about an inversion centre at the mid-point of the central C-C bond. The Zn(2+) cation is situated on a twofold rotation axis and is surrounded by four O atoms from four symmetry-related butane-1,2,3,4-tetra-carboxyl-ate anions in a distorted tetra-hedral environment. In turn, each anion coordinates to four Zn(2+) cations. The bridging mode of the anions leads to a three-dimensional framework structure with channels extending along [110] and [010] in which the ammonium cations and the water mol-ecules are located. N-H⋯O and O-H⋯O hydrogen bonding between the cations and water mol-ecules and the uncoordinating O atoms of the carboxyl-ate groups consolidates the crystal packing.

The structure of the title salt adduct, (C(4)H(9))(4)N(+)·C(6)H(5)AsO(3)H(-)·C(6)H(5)AsO(3)H(2), features chains along the a axis comprising alternating hydrogen phenyl-arsonate anions and phenyl-arsonic acid mol-ecules linked by O-H⋯O hydrogen bonds.

The title salt, C4H10Br2N+·Br−, crystallizes with four cations and four anions in the asymmetric unit. In the crystal, the bis(2-bromoethyl)ammonium cations and bromide anions are linked into chains by N—H...Br hydrogen bonds describing a binaryC21(4) motif along [010]. Each of these chains is formed by a unique cation and anion pair. The ammonium cations occur in the less preferredanticonformation, characterized by different NCCBr torsion angles. Adjacent chains are linked by weak C—H...Br interactions, forming a three-dimensional network. The crystal studied was a pseudo-merohedral twin with twin ratio 0.640 (2):0.360 (2).

The title compound, 2C(2)H(8)N(+)·C(30)H(12)N(2)O(12) (2-)·2H(2)O, comprises dimethyl-ammonium cations, 3,3'-dicarb-oxy-5,5'-(5,7,12,14-tetra-oxo-6,13-diaza-tetra-cyclo-[6.6.2.0(4,16).0(11,15)]hexa-deca-1,3,8,10,15-penta-ene-6,13-di-yl)dibenzoate dianions and water mol-ecules. The dianion is situated on a crystallographic inversion centre. Two very strong symmetry-restricted O⋯H⋯O hydrogen bonds are present which are situated about the crystallographic inversion centres. In one of these hydrogen bonds, the H atom is situated at its centre, while in the other one the H atom is disordered about its centre. Both H atoms are involved in the chain-like C(2) (2)(16) motif, and not in a more common motif R(2) (2)(8) that is composed of a pair of hydrogen carboxyl-ates with the H atoms situated about the centre between the pair of O atoms. In the crystal, inter-action of these hydrogen bonds results in formation of anionic layers of dianions parallel to (-111). The water mol-ecules donate their H atoms to one of two of the carboxyl-ate O atoms, forming strong hydrogen bonds. The dimethyl-ammonium donates a bifurcated hydrogen bond to an oxo group of the dianion, forming weak hydrogen bonds. All the hydrogen bonds form a three-dimensional hydrogen-bonded network.

The racemic title compound, C9H11NO4·H2O, a tricyclic rearranged aminonorbornane dicarboxylic acid, is a conformationally rigid analogue of glutamic acid and exists as an ammonium-carboxylate zwitterion, with the bridghead carboxylic acid group anti-related. In the crystal, N—H...O and O—H...O hydrogen bonds involving the ammonium, carboxylic acid and water donor groups with both water and carboxyl O-atom acceptors give a three-dimensional framework structure.

The title salt, C(16)H(24)N(4) (2+)·2C(7)H(7)O(3)S(-), crystallizes with the dication situated on an inversion center and the anion in a general position. The cation contains two ammonium and two free amine groups, and the observed conformation for the chain linking the benzene rings is different from that found in the free tetra-amine and in the fully protonated tetra-amine. All amine and ammonium H atoms of the cation form hydrogen bonds with eight symmetry-related anions, using the sulfonate O atoms as acceptors. This arrangement for the ions precludes any π-π contacts between benzene rings in the crystal.

The crystal structure of the title salt, [Fe(C5H5)(C15H19NO)](C4H5O2), consists of discrete ammonium and carboxylate ions, which associate into infinite chains parallel to [100] by means of N—H...O and O—H...O interactions. These chains are further cross-linked into a three-dimensional network by additional C—H...O contacts and by offset π–π stacking interactions of inversion-related aromatic rings [centroid–centroid distance = 3.7040 (14) Å]. The molecular parameters of the ionic components are in no way unexpected, the geometry of the ammonium cation being similar to that found in other structurally characterized salts obtained from N-ferrocenylmethyl β-aminoalcohols. The (E)-but-2-enoate anion consists of two approximately planar subunits, viz the delocalized carboxylate unit and the butenyl group (the latter being planar within ca. 0.002 Å), which are mutually rotated by 30.3 (4)°.

In the cation of the title salt, C20H24NO+·C4H3O4−, the N atom in the dimethylammonium group is protonated. The dihedral angle between the mean planes of the two six-membered rings fused to the cyclohepten-5-yl ring is 54.4 (1)°. An intramolecular O—H...O hydrogen bond occurs in the anion. The crystal packing is stabilized by intermolecular O—H...O and N—H...(O,O) hydrogen bonds and weak C—H...O interactions, forming a two-dimensional network.

In the title compound, NH(4) (+)·(C(2)H(5)O)(2)PS(2) (-), the ammonium cation is connected by four charge-assisted N-H⋯S hydrogen bonds to four tetra-hedral O,O'-diethyl dithio-phosphate anions, forming layers parallel to (100). The polar and non-polar constituents of the layers are stacked alternately along [100]. Inter-lacing of the external ethyl groups through van der Waals inter-actions combines these layers into a three-dimensional structure.

The title complex, {(C(2)H(8)N)[Y(C(2)O(4))(2)(H(2)O)]·3H(2)O}(n), was obtained accidentally under hydro-thermal conditions. The Y(III) atom is chelated by four oxalate ligands and one water mol-ecule resulting in a distorted tricapped trigonal-prismatic geometry. Each oxalate ligand bridges two Y(III) atoms, thus generating a three-dimensional network with cavities in which the ammonium cations and lattice water mol-ecules reside. Various O-H⋯O and N-H⋯O hydrogen-bonding inter-actions stabilize the crystal structure. The title complex is isotypic with the Eu and Dy analogues.

In the title ammonium polyoxometallate salt, (C6H16N)4[H2V10O28], the anion features O atoms engaged in μ6-, μ3- and μ2-bridging of adjacent VV atoms, confering an octahedral coordination at each of the twenty unique metal atoms. Two anions are linked by μ3- and μ2-bridged OH units across a center of inversion, forming a dimer which is linked to the cations by N—H...O hydrogen bonds. The cation is disordered over two positions in a 0.776 (4):0.224 (4) ratio in one of the two independent ion pairs in the asymmetric unit, and 0.627 (10):0.373 (10) in the other.

International audience; The title compound, {(C(2)H(10)N(2))(1.5)[Y(C(4)O(4))(3)(H(2)O)(4)]}(n) {system-atic name: catena-poly[sesqui(ethyl-enediammonium) [[tetra-aquabis-(squarato-κO)yttrium(III)]-μ-squarato-κ(2)O:O']]}, was synthesized by slow evaporation of an acid solution. The asymetric unit contains one yttrium cation in an anti-prismatic environnement, three squarate groups, one and a half protonated ethyl-enediamine mol-ecules and four water mol-ecules. YO(8) polyhedra are connected through bis-(mono-dentate) squarates, leading to infinite zigzag chains, in between which are located ammonium groups. A framework of hydrogen bonds between protonated amine N atoms, water mol-ecules and squarate anions ensures the cohesion of the structure.

The title compound, [(CH3)3NH]2[Sn(C6H5)2Cl4], consists of [(CH3)3NH]+ cations and [SnPh2Cl4]2− anions in which the Sn atom, located on a centre of inversion, is bonded to four Cl atoms and two phenyl rings, giving an octahedral geometry with the phenyl rings in trans positions. In the crystal, the cations and the anions are connected by N—H...Cl hydrogen bonds and C—H...Cl interactions.

The title compound, [Au(C18H27ClN3)(C18H15P)](NO3)2, is a coordination complex of gold(I) triphenylphosphine with the N atom in the quinoline ring of the common antimalarial compound chloroquine (CQ). The pendant diethylamino group of the CQ ligand was found to be protonated. The complex exhibits a nearly linear coordination geometry around the AuI atom [N—Au—P = 176.94 (6)°], with Au—N and Au—P bond lengths of 2.070 (2) and 2.2338 (7) Å, respectively. The diethylammonium group and one of the two nitrate counter-ions are disordered with occupancy ratios of 0.519 (4):0.481 (4). The nitrate anions are hydrogen bound to both the amino and ammonium groups of the N,N-diethylpentanaminium fragment of the CQ.

The title compound, {(C(2)H(8)N)[Dy(C(2)O(4))(2)(H(2)O)]·3H(2)O}(n), was obtained as an unexpected product under hydro-thermal conditions. The Dy(III) atom is chelated by four oxalate anions, two of which are situated on two different centres of inversion. The distorted tricapped trigonal-prismatic coordination sphere of the Dy(III) atom is completed by a water mol-ecule. The bridging mode of the anions results in the formation of a three-dimensional network with cavities where the ammonium cations and the uncoordinated water mol-ecules reside. The structure is stabilized by numerous N-H⋯O and O-H⋯O hydrogen-bonding inter-actions.

The title compound, (C(2)H(10)N(2))[Ni(C(16)H(14)N(2)O(2))](4)(ClO(4))(2)·C(3)H(7)NO, crystallizes with four Ni(salen) mol-ecules {salen is 2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolate}, one ethyl-enediammonium cation (actually two half-cations, each located on a center of inversion), two perchlorate anions and one dimethyl-formamide solvent mol-ecule in the asymmetric unit. Each Ni(II) cation in the Ni(salen) complex is four-coordinated by two imine N atoms and two phenolate O atoms from the tetra-dentate ligand. The Ni(salen) units form parallel slipped stacks with Ni⋯Ni separations of 3.4541 (4) and 3.6442 (6) Å. The crystal packing is stabilized by inter-molecular hydrogen bonds between the ammonium H atoms and the perchlorate and salen O atoms, which generate a three-dimensional structure.

The title compound, (C(2)H(10)N(2))(3)(C(2)H(9)N(2))(2)[Mo(5)(HPO(4))(2)O(15)]·10H(2)O, was prepared under hydro-thermal conditions at pH 5.0. The structure contains mono- and diprotonated ethyl-enediamine cations, [Mo(5)O(15)(HPO(4))(2)](4-) anions and uncoord-in-ated water mol-ecules. The [Mo(5)O(15)(HPO(4))(2)](4-) hetero-poly-oxometallate anion is made up of five MoO(6) octa-hedra sharing an edge and forming a ring, which is closed by common corners of the terminal MoO(6) octa-hedron. The ring is topped on both sides by two slightly distorted PO(4) tetra-hedra, sharing three corners with three MoO(6) octa-hedra. The terminal oxygen atoms of the PO(4) units are protonated. Together with the anions, the water mol-ecules and the ethyl-enediammonium cations are involved in N-H⋯O and O-H⋯O hydrogen bonding, forming a three-dimensional supra-molecular network.

The title complex, (C(8)H(20)N)[Co(CN)(4)(C(10)H(8)N(2))]·CH(3)CN·1.5H(2)O, consists of tetra-ethyl ammonium cations, mononuclear [Co(III)bpy(CN)(4)](-) anions and uncoordinated water and acetonitrile mol-ecules. The Co(III) atom is six-coordinated by two 2,2'-bipyridine (bpy) N atoms and four cyanide C atoms in a distorted octa-hedral geometry. The acute bite angle of the chelating bpy [82.28 (8)°] is the main factor accounting for this distortion. In addition, the tetra-ethyl-ammonium cation is significantly disordered [occupancy ratio 0.611 (3):0.389 (3)]. The presence of water mol-ecules, one of which is disordered over two positions about an inversion center, results in the formation of a network of O-H⋯N hydrogen bonds involving the cyanide N atoms.

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.

The crystal structure of the title compound, C(8)H(12)N(+)·Cl(-)·H(2)O, consists of hydro-phobic layers of dimethyl-anilinium cations parallel to the bc plane alternated by hydro-philic layers of chloride anions and water mol-ecules. The layers are linked by N-H⋯O and N-H⋯Cl hydrogen bonds involving the ammonium groups of the cations. The cohesion of the ionic structure is further stabilized by O-H⋯Cl hydrogen-bonding inter-actions.

In the title compound, (NH(4))(2)[Fe(C(10)H(12)N(2)O(8))(H(2)O)]·3H(2)O, the Fe(II) center is in a distorted penta-gonal-bipyramidal geometry. Two carboxyl-ate O and two N atoms from the ethyl-enediaminetetra-acetate (EDTA) ion and one O atom from coordinated water comprise the equatorial plane. Two other carboxyl-ate O atoms from the EDTA ion occupy the apical sites. Both ammonium cations and all water mol-ecules function as hydrogen-bond donors, and ten N-H⋯O and nine O-H⋯O hydrogen bonds form a three-dimensional network between the complex anions, cations and the water mol-ecules.

The title compound, NH(4)YbP(2)O(7), crystallizes in the KAlP(2)O(7) structure type and consists of distorted YbO(6) octa-hedra and bent P(2)O(7) (4-) diphosphate units forming together a three-dimensional network. There are channels in the structure running along the c axis, where the NH(4) (+) cations are located. They are connected via N-H⋯O hydrogen bonds to the terminal O atoms of the diphosphate anions.

In the title mixed-organyl stannate, (C(12)H(24)N)[Sn(C(6)H(5))(2)(C(6)H(11))(CClF(2)O(2))(2)], there are two cations and two anions in the asymmetric unit. Each five-coordinate Sn atom shows trans-C(3)SnO(2) trigonal bipyramidal coordination. The four Sn-O distances are approximately equal in the two independent anions. Each ammonium cation serves as a hydrogen-bond donor to two stannates, the hydrogen-bonding inter-actions giving rise to linear hydrogen-bonded chains.

The title compound, (C3H10N)2[MoS4], was synthesized by passing a rapid stream of H2S into an aqueous isopropylamine solution of molybdic acid. The title compound is isotypic with the corresponding W analogue (C3H10N)2[WS4]; its structure consists of a slightly distorted tetrahedral [MoS4]2− dianion and two crystallographically independent isopropylammonium cations, with all atoms located in general positions. The cations and anion are linked by weak N—H...S and C—H...S interactions, the strength and number of which can explain the observed Mo—S bond distances.

The asymmetric unit of the title compound, (C8H12NO)2[Mn(H2P2O7)2(H2O)2]·2H2O, consists of half an MnIIcomplex anion, a 2-methoxybenylammonium cation and a solvent water molecule. The MnIIcomplex anion lies across an inversion center, and has a slightly distorted octahedral coordination environment for the MnIIion, formed by two bidentate dihydrogendiphosphate ligands and two water molecules. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, forming layers parallel to (100). An intramolecular N—H...O hydrogen bond is also observed.

In the title compound, {(C4H12N)[Mn(HCO2)3]} n , the Mn(II) atom lies on an inversion centre and is coordinated by O-atom donors from the three double-bridging formate ligands, one of which lies across a crystallographic mirror plane, giving a slightly distorted octahedral coordination sphere. A three-dimensional NaCl-type framework is generated in which the tetra-methyl-ammonium cations, which lie across mirror planes and occupy the cavities in the polymer structure, form weak C-H⋯O hydrogen bonds with the formate ligands.

The asymmetric unit of the title salt, C4H12NO2+·C6H2N3O7−, contain two bis(2-hydroxyethyl)ammonium cations and two picrate anions. An intramolecular N—H...O hydrogen bond occurs in each cation. In the crystal, molecules are linked via O—H...O and N—H...O hydrogen bonds, which generate two R21(6), an R22(10) and an R22(13) graph-set ring motifs. There are also a number of C—H...O hydrogen bonds present. The sum of these interactions leads to the formation a three-dimensional structure.

The title organic-inorganic hybrid compound, {(C7H20N2)[BiCl5]} n , consists of distorted corner-joined [BiCl6] octa-hedra forming zigzag polymeric anionic chains parallel to [001], separated by columns of heptyl-enedi-ammonium cations. The asymmetric unit contains two crystallographically independent bis-muth metal atoms, one of which lies on an inversion centre and the other on a twofold axis. In the crystal, the polymeric chains and cations are linked by N-H⋯Cl hydrogen bonds, forming undulating layers parallel to (110).

In the crystal of the title molecular salt, C7H10N(+)·C6H5O4S(-), the benzene-sulfonate units are linked through phenol-sulfonate O-H⋯O hydrogen bonds, forming chains along the c-axis direction. These chains are linked via N-H⋯O hydrogen bonds involving two of the three H atoms of the ammonium group of the 4-methyl-anilium cation, giving rise to two-dimensional networks parallel to the bc plane which are further connected through an additional N-H⋯O inter-action in which the third ammonium H atom is involved, generating a three-dimensional network.

The title organic salt, 6C3H10N+·C10H2O84−·C10H4O82−·4H2O, contains seven independent entities in the asymmetric unit which comprises three propylammonium cations, two water molecules, half a 2,5-dicarboxybenzene-1,4-carboxylate dianion (H2btc2−) and half a benzene-1,2,4,5-tetracarboxylate tetraanion (btc4−), the latter two anions being located about centres of inversion. One of the water molecules is disordered over two positions in a 0.55 (2):0.45 (2) ratio. The combination of molecular ions and water molecules results in an extensive and complex three-dimensional network of hydrogen bonds, the network being made up of nine unique N—H...O interactions between the ammonium cations and the anions, as well as four unique O—H...O interactions between the water molecules and the anions.

The title salt, (C₈H₂₀N)[Ni(NCS)₃(C₁₀H₁₀N₆)], consists of a tetra-ethyl-ammonium cation and an anion comprising an octa-hedral Ni(II) atom surrounded by three N atoms from a tripodal tris-(pyrazol-1-yl)methane ligand, and three thio-cyanate ligands, each bound at the N-atom end. The ligand Ni-N distances range from 2.097 (2) to 2.127 (2) Å for the tripodal ligand and from 2.045 (2) to 2.075 (2) Å for the thio-cyanate ligands. The dihedral angles between the three pyrazole rings are 59.03 (12), 53.09 (10) and 67.90 (10)°.

The asymmetric unit of the title organic salt, C2H8N+·C8H5O4 −, consists of two dimethylammonium cations and two 3-carboxybenzoate anions. The 3-carboxybenzoate anions are linked via strong intermolecular and nearly symmetrical O—H...O hydrogen bonds forming infinite chains parallel to [111]. Neighbouring chains are further connected by the dimethylammonium cations via N—H...O bonds, resulting in a double-chain-like structure. The dihedral angles of all carboxylate groups with respect to the phenylene rings are in the range 7.9 (1)–20.48 (9)°.

In the title molecular salt, 2C6H11NH3+·C8H4O42−, the terephthalate dianion is close to being planar (r.m.s. deviation = 0.049 Å). In the crystal, the cations and anions are linked by N—H...O hydrogen bonds into (010) sheets. Of the four terephthalate O atoms, two accept two hydrogen bonds each and two accept one hydrogen bond each.

In the title salt, [(C6H11)2NH2]+·[C6H5PO2(OH)]−, the anion is monodeprotonated and acts as both a hydrogen-bond donor and acceptor. The anions are linked by pairs of O—H...O interactions, forming inversion dimers with R22(8) ring motifs. These dimers are bridged by two dicyclohexylaminium cations via pairs of N—H...O hydrogen bonds, giving R44(12) ring motifs, forming chains propagating along [010]. The chains are bridged by C—H...O interactions, forming a two-dimensional network lying parallel to (101).

In the anion of the title salt, C6H16N+·C18H13O8−, one of the carboxyl groups is deprotonated. Its O atoms are involved in intermolecular hydrogen bonding with the carboxyl group of an adjacent anion and the amino group of an adjacent cation. The two benzoyloxy rings are oriented with respect to each other at a dihedral angle of 79.46 (6)°.

In the crystal of the title salt, 2C2H8N+·C6H4O8S22−, the anion lies on a center of inversion. The dimethylammonium cation forms one N—H...O hydrogen bond and another bifurcated N—H...O hydrogen bond. The hydroxy group links with the sulfonyl group via an intermolecular O—H...O hydrogen bond. These N—H...O and O—H...O hydrogen bonds generate a three-dimensional network.

In the title compound, (C(6)H(20)N(4))(2)[Ge(2)S(6)], the dimeric [Ge(2)S(6)](4-) anion is formed by two edge-sharing GeS(4) tetra-hedral units. The average terminal and bridging Ge-S bond lengths are 2.158 (14) and 2.276 (6) Å, respectively. The anions and the diprotonated ammonium cations are organized into a three-dimensional network by N-H⋯S and N-H⋯N hydrogen bonds.

The asymmetric unit of the title salt, 2C2H8NO+·C8H4O42−, comprises one crystallographically independent 2-hydroxyethanaminium cation and one half terephthalate anion. In the crystal, hydrogen bonds involving the hydroxy and ammonium groups of the cations and the carboxylate O atoms of the terephthalate anions result in the formation of a three-dimensional network structure.

In the title hydrated molecular salt, C4H14N2O2+·C2O42−·H2O, the oxalate dianion is almost planar (r.m.s. deviation = 0.020 Å). In the crystal, the components are linked by N—H...O(water), N—H...O(oxalate) O—H(ammonium)...O(oxalate), O—H(water)...O(oxalate) and O—H(water)...O(ammonium) hydrogen bonds, thereby forming a complex three-dimensional packing motif.

In the crystal structure of the title compound, (C(10)H(16)N)(2)[Hg(2)Br(6)], the condensed anion consists of two edge-sharing HgBr(4) tetrahedra and is situated on a centre of symmetry. The anions are linked to the cations through weak C-H⋯Br inter-actions.

In the title compound, 3C12H24N+·C5H7N2O7P23−·C2H6O·H2O, the zoledronic acid molecule is singly protonated and stabilized by an intramolecular O—H...O interaction. The three-dimensional crystal structure is stabilized by intermolecular O—H...O, O—H...N and N—H...O interactions. The ethanol solvent molecule is disordered over two positions; the site-occupancy factor of the major component is 0.510 (4).

In the crystal structure of the title compound, C(4)H(12)N(+)·BH(4) (-), the tetra-methyl-ammonium cations are situated on special positions with site symmetry [Formula: see text]m2. The borohydride anions are situated on special positions with 4mm site symmetry and show rotational disorder around the fourfold axis.