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The title fluoridogermanate, {[Cd2(C6H18N4)3][GeF6]}n, was synthesized hydro­thermally. The crystal structure comprises undulated cationic [Cd2(TETA)3]4+ chains (TETA is triethyl­ene­tetra­mine) propagating parallel to [101]. The central CdII atom is six-coordinated in a CdN6 set by three TETA ligands. The isolated [GeF6]2− units, serving as counter-anions, occupy the inter-chain spaces and simultaneously link adjacent chains into a three-dimensional network through extensive N—H⋯F hydrogen-bonding inter­actions. One of the ethyl­ene bridges of one TETA ligand is disordered around a twofold rotation axis.

The title compound, [Zn(C2H8N2)3](SiF6), was synthesized ionothermally using choline chloride–imidazolidone as solvent and template provider. In the crystal structure, the anions and cations are located on special positions of site symmetry 3.2 and show a typical octa­hedral geometry. The ZnII ion is coordinated by six N atoms from three ethyl­enediamine mol­ecules. The crystal structure displays weak hydrogen bonding between [SiF6]2− anions and the ethyl­enediamine NH hydrogen atoms.

In the title compound, [Mn(C2H8N2)3]SO4, the metal atom (site symmetry 3.2) is coordinated by six N atoms from three ethyl­enediamine (en) ligands in a slightly distorted octa­hedral geometry. The en ligands are generated from one half-mol­ecule in the asymmetric unit. The O atoms of the sulfate anion (S site symmetry 3.2) are disordered over four orientations in a 0.220 (12):0.210 (13):0.203 (14):0.10 (2) ratio, with one of the O atoms having site symmetry 3. In the crystal, the ions are connected by N—H⋯O hydrogen bonds, forming a three-dimensional network.

The title compound, [Co(C2H8N2)3]2[SiMo8V4O40(VO)2]·6H2O, was prepared under hydro­thermal conditions. The asymmetric unit consists of a transition metal complex [Co(en)3]3+ cation (en is ethyl­enediamine), one half of an [SiMo8V4O40(VO)2]6− heteropolyanion, two solvent water mol­ecules in general positions and two half-mol­ecules of water located on a mirror plane. In the complex cation, the Co3+ ion is in a distorted octa­hedral coordination environment formed by six N atoms of the three chelating en ligands. One of the en ligands exhibits disorder of its aliphatic chain over two sets of sites of equal occupancy. The [SiMo8V4O40(VO)2]6− heteropolyanion is a four-electron reduced bivanadyl-capped α-Keggin-type molybdenum–vanadium–oxide cluster. In the crystal, it is located on a mirror plane, which results in disorder of the central tetra­hedral SiO4 group: the O atoms of this group occupy two sets of sites related by a mirror plane. Furthermore, all of the eight μ2-oxide groups are also disordered over two sets of sites with equal occupancy. There are extensive inter­molecular N—H⋯O hydrogen bonds between the complex cations and inorganic polyoxidoanions, leading to a three-dimensional supra­molecular network.

In the title compound, [Cu(C2H8N2)2](C12H6N2O4S2)·1.5H2O, there are two half-molecules of the cationic complex in the asymmetric unit. The Cu2+ ions lie on inversion centres and are octa­hedrally coordinated by two ethyl­enediamine (en) and two aqua ligands in a typical Jahn–Teller distorted environment with the water O atoms in the axial positions. Two 2-mercaptonicotinate units (mnic) are linked by a disulfide bridge. All the ethyl­enediamine N—H and O—H groups form inter­molecular hydrogen bonds with acceptor O and N atoms, giving rise to a three-dimensional network. One of the uncoordinated water molecules has a site occupation factor of 0.5.

The title compound, [AlCu3W12O40(C2H8N2)6(H2O)3], was prepared under hydro­thermal conditions. The Cu2+ ion displays an elongated octa­hedral geometry defined by one bridging O atom from the polyoxidoanion and a coordinated water mol­ecule in axial positions and four N atoms of the two chelating ethyl­enediamine (en) ligands in equatorial positions. The one-electron reduced [AlW12O40]6− anion coordinates three [Cu(en)(H2O)]2+ fragments, generating a neutral tri-supported Keggin-type polyoxidometalate (POM). This tri-supported POM is located in a special position of symmetry and therefore O atoms from the central AlO4 tetra­hedron are disordered over two sets of sites. Disorder is also observed for three other bridging O atoms of the POM. In the crystal, mol­ecules are connected via N—H⋯O and O—H⋯O hydrogen bonds, forming a three-dimensional framework.

The structure of the title compound, [CoII(C2H8N2)3]SO4, the cobalt example of [M(C2H8N2)3]SO4, is reported. The Co and S atoms are located at the 2d and 2c Wyckoff sites (point symmetry 32), respectively. The Co atom is coordinated by six N atoms of three chelating ethyl­enediamine mol­ecules generated from half of the ethyl­enediamine mol­ecule in the asymmetric unit. The O atoms of the sulfate anion are disordered mostly over two crystallographic sites. The third disorder site of O (site symmetry 3) has a site occupancy approaching zero. The H atoms of the ethyl­enediamine mol­ecules inter­act with the sulfate anions via inter­molecular N—H⋯O hydrogen-bonding inter­actions.

The Co ion in the title salt, [Co(NO3)(H2NCH2CH2NH2)2](OH)(NO3), has oxidation state + III and is coordinated by four N atoms from two ethyl­enediamine mol­ecules and two O atoms from a nitrate anion in a distorted octa­hedral geometry. The charge of the complex cation is balanced by a hydroxide anion and a nitrate anion. The cations and anions are connected by N—H⋯O and O—H⋯O hydrogen bonds, resulting in a three-dimensional supra­molecular framework. There are two independent ion pairs with similar configurations in the unit cell. Both uncoordinated nitrate counter-anions are disordered.

In the title compound, [Ni(C2H8N2)3][O2P(OCH3)2]2, the NiII atom is six-coordinated in a distorted octa­hedral geometry by six N atoms from three ethyl­enediamine ligands. The P atoms of the anions adopt a distorted tetra­hedral geometry. In the crystal, inter­molecular N—H⋯O and C—H⋯O hydrogen bonds link the cations and anions into a three-dimensional network.

The title compound [systematic name: bis(2,5-dioxo-4,4-diphenylimidazolidin-1-ido-κN 1)bis(ethylenediamine-κ2 N,N′)cobalt(II)], [Co(C15H11N2O2)2(C2H8N2)2], has site symmetry . The CoII cation is located on an inversion center and coordinated by two phenytoin anions and two ethyl­enediamine ligands in a distorted octa­hedral geometry. In the phenytoin anion, the two phenyl rings are twisted with respect to the central hydantoin ring, making dihedral angles of 77.49 (16) and 64.55 (15)°. Intra­molecular and inter­molecular N—H⋯O hydrogen bonding is present in the crystal structure.

The asymmetric unit of the title compound, [Ni(C2H8N2)3](C5H2N2O4)·1.67H2O, consists of three [Ni(en)3]2+ dications (en is ethyl­enediamine), three [(pzdc)3]2− dianions (pzdc is pyrazole-3,5-dicarboxyl­ate) and five water mol­ecules. In each complex dication, the NiII atom is coordinated by six N atoms from three en ligands forming a distorted octa­hedral coordination geometry. In the crystal, the ions and water mol­ecules are linked into a three-dimensional framework by a large number of N—H⋯O and O—H⋯O hydrogen bonds.

In the crystal structure of the title compound, [Co(C3H4N2)6](PF6)3·6H2O, the CoIII atom lies on a special position with site-symmetry and the P atom is located on a special position with site symmetry . The CoIII atom has an almost ideal octa­hedral coordination formed by the N atoms of six imidazole ligands. The water mol­ecules form hydrogen-bonded helical chains propagating in [001] by O—H⋯O inter­actions with a distance of 2.913 (2) Å. They simultaneously inter­act as hydrogen-bond acceptors and donors with the cations and anions, respectively, resulting in the formation of a three-dimensional assembly. Weak C—H⋯F inter­actions further stabilize the crystal structure.

The crystal structure of the title compound, [Cd2Cl2(C2H8N2)4]Cl2, consists of binuclear centrosymmetric [Cd2(C2H8N2)4Cl2]2+ cations and discrete chloride anions. The CdII cation is coordinated by four N atoms of two ethyl­enediamine ligands and two symmetry-related chloride anions within a distorted CdN4Cl2 octa­hedron. Two CdII cations are connected by two chloride anions via μ2-coordination, forming a four-membered Cd2Cl2 ring. The uncoordinated chloride anions are linked to the amino groups via N—H⋯Cl hydrogen bonding. Two C atoms of one of the two crystallographically independent ethyl­enediamine ligands are disordered and were refined using a split model [occupancy ratio 0.674 (9):0.326 (9)].

The title compound, (C10H18N)2[GeF6], was obtained hydro­thermally from an aqueous solution of GeO2, H3BO3, NiCl2, adamantylammonium chloride, butanol and hydro­fluoric acid. The structure consists of discrete bis(1-adamantylammonium) cations lying on crystallographic mirror planes and hexa­fluoridogermanate anions disordered about sites of 2/m point symmetry. In the latter, the Ge atom lies on the site of 2/m symmetry, one F atom lies on the mirror plane and two further F atoms are included in general positions with 50% site occupancy. The cations and anions lie in layers with N—H⋯F hydrogen bonds formed between them.

The asymmetric unit of the title compound, [Ni(C2H8N2)3](C8H4O5)·H2O, contains one [Ni(en)3]2+ cation (en is ethane-1,2-diamine), one 5-hy­droxy­isophthalate dianion and one water mol­ecule. In the cation, the Ni2+ ion is coordinated by six N atoms from three ethyl­enediamine ligands in a distorted octa­hedral geometry. The complex ions and water mol­ecules are linked by weak N—H⋯N/O and O—H⋯N/O hydrogen bonds into a three-demensional structure.

The title mononuclear NiII complex, [Ni(C11H11N2O5)2(C2H8N2)2], is built up by inversion symmetry associated with the central Ni atom. The ethyl­enediamine ligands are non-planar. The r.m.s. deviation from the mean plane of the five-membered Ni–ethyl­amine chelate ring plane is 0.1945 Å. In the crystal structure, complex mol­ecules are linked to each other via N—H⋯O and O—-H⋯O hydrogen bonding through translation symmetry along the b and c axes, resulting in an extended supra­molecular network.

In the cation of the title compound, [Cu(C2H8N2)2(CH3OH)2](C8H4O4)·2CH3OH, the CuII atom lies on an inversion centre. The four N atoms of two ethyl­enediamine ligands around the CuII atom form the equatorial plane, while two methanol O atoms in the axial positions complete a Jahn–Teller distorted octa­hedral coordination. The benzene-1,4-dicarboxyl­ate anion is centrosymmetric. In the crystal, C—H⋯O, N—H⋯O and O—H⋯O hydrogen bonds link the cations, the anions and the methanol solvent mol­ecules.

The asymmetric unit of the title compound, [Sn(C3H6NO)Cl3(H2O)]2·C12H24O6, comprises a six-coordinate tin complex and a 18-crown-6 mol­ecule, the latter disposed about a centre of inversion. The tin atom is coordinated by three Cl atoms, that define a facial arrangement, a chelating C-,O- ligand, and a water mol­ecule. The resulting CCl3O2 donor set defines a distorted octa­hedral geometry. The tin-bound aqua ligand forms O—H⋯O hydrogen bonds to the centrosymmetric 18-crown-6 mol­ecule, resulting in a tri-mol­ecular aggregate. These assemble into a supra­molecular chain along the a axis being connected by N—H⋯O hydrogen bonds.

The title compound, (C4H5N2O)5[Cd3Cl11], was obtained from the reaction of 2-hydroxy­pyrimidine hydro­chloride and cadmium(II) chloride in concentrated HCl solution. The crystal structure consists of planar 2-oxo-1,2-dihydro­pyrimidin-3-ium cations with both N atoms protonated and the O atom unprotonated, and a complex trinuclear [Cd3Cl11]5− anion of approximately D 3h symmetry, which has a triangle of three octa­hedrally coordinated CdII centres bonded to 11 chloride ions. Three of the chloride ions bridge adjacent Cd atoms, two cap the faces of the Cd3 triangle and the remaining six are terminally bonded and act as hydrogen-bond acceptors. Various N—H⋯Cl hydrogen bonds connect the anions and cations and, in addition, inter­molecular N—H⋯O hydrogen bonds contribute to the formation of a three-dimensional network.

The centrosymmetric mol­ecule of the title complex, [Cd4Cl8(C3H4N2)6(C3H7NO)2], contains four CdII atoms, six imidazole, two dimethyl­formamide and eight chloride ligands. The structure shows a novel chloride-bridged tetra­nuclear cadmium quasi-cubane cluster. The coordination geometry of all CdII atoms is distorted octa­hedral, with the two metal atoms in the asymmetric unit in different coordination environments. One of the Cd2+ ions is coordinated by five Cl− ions and by one N atom from an imidazole ligand, while the second is coordinated by three chloride ligands, two N atoms from two imidazole ligands and one O atom from a dimethyl­formamide mol­ecule. Inter­molecular N—H⋯Cl hydrogen bonds link the mol­ecules into a two-dimensional polymeric structure parallel to the ab plane.

In the title compound, [Ni(C12H6N2O4)(H2O)2], the NiII atom (site symmetry 2) displays a distorted cis-NiN2O4 octa­hedral coordination geometry with two N atoms and two O atoms of the tetra­dentate 2,2′-bipyridine-6,6′-dicarboxyl­ate ligand in the equatorial plane and two water mol­ecules in axial positions. The complete dianionic ligand is generated by crystallographic twofold symmetry. In the crystal, a two-dimensional supra­molecular structure parallel to (001) is formed through O—H⋯O hydrogen-bond inter­actions between the coordinated water mol­ecules and the O atoms of nearby carboxyl­ate groups.

Cyclo­hexa­phospho­ric acid (P6O18H6) reacts with cadmium carbonate and 4-chloro­benzyl­amine (CBA) to give the mononuclear title complex, (C7H9ClN)4[Cd(P6O18)]n, in which the CdII atom, lying on an inversion centre, has an octa­hedral coordination built of six O atoms of two centrosymmetric P6O18 rings. Each P6O18 ligand acts as a bridge, linking two CdII atoms and forming an anionic coordination polymer [Cd(P6O18)4−]n extending along [010]. Adjacent polymeric chains are connected through N—H⋯O and C—H⋯O hydrogen bonds, generating a three-dimensional supra­molecular network.

In the title compound, [Co(C8H6N3)2(C2H8N2)]NO3·H2O, the CoIII ion is coordinated by four N atoms from two 2-(pyridin-2-yl)-1,3-imidazol-1-ide ligands and two N atoms of ethyl­enediamine in a distorted octa­hedral geometry. In the crystal, classical N—H⋯N(O) and O—H⋯N(O) hydrogen bonds connect all the isolated components together to yield a three-dimensional structure.

In the title complex, {[Cu(SiF6)(C11H8N2O)2]·2H2O}n, the CuII atom adopts an N4F2-octa­hedral coordination geometry with four pyridine N atoms in the equatorial sites and two F atoms in the axial sites. The di-3-pyridyl­methanone and hexa­fluoro­silicate ligands act as bidentate ligands, linking symmetry-related CuII atoms. Water mol­ecules form O—H⋯O and O—H⋯F hydrogen bonds with the di-3-pyridyl­methanone and hexa­fluoro­silicate ligands. The Cu2+ and SiF6 2− ions are each located on a twofold axis.

The title compound, [Cu3(C7H3NO4)4(C2H8N2)2]·C2H8N2·4H2O, was obtained by the reaction of copper(II) acetate dihydrate with pyridine-2,6-dicarb­oxy­lic acid (H2dipic) and ethyl­enediamine (en) in an aqueous solution. All of the CuII atoms in the trinuclear centrosymmetric title complex are six-coordinated in a distorted octa­hedral geometry with N2O4 and N4O2 environments for the outer and central CuII atoms, respectively. Various inter­actions, including numerous O—H⋯O and C—H⋯O hydrogen bonds and C—O⋯π stacking of the pyridine and carboxyl­ate groups [O⋯centroid distances = 3.669 (2) and 3.668 (2) Å] are observed in the crystal structure.