Crystal structures of two copper(I)-6,6'-dimethyl-2,2'-bipyridyl (dmbpy) compounds, [Cu(dmbpy)2]2[MF6]·xH2O (M = Zr, Hf; x = 1.134, 0.671)

The syntheses and crystal structures of two bimetallic mol-ecular compounds, namely, bis[bis-(6,6'-dimethyl-2,2'-bi-pyridine)-copper(I)] hexa-fluorido-zir-con-ate(IV) 1.134-hydrate, [Cu(dmbpy)₂]₂[ZrF₆]·1.134H₂O (dmbpy = 6,6'-di-methyl-2,2'-bipyri-dyl, C₁₂H₁₂N₂), (I), and bis[bis-(6,6'-dimethyl-2,2'-bi-pyr-idine)-copper(I)] hexa-fluorido-hafnate(IV) 0.671-hydrate, [Cu(dmbpy)₂]₂[HfF₆]·0.671H₂O, (II), are reported. Apart from a slight site occupany difference for the water mol-ecule of crystallization, compounds (I) and (II) are isostructural, featuring isolated tetra-hedral cations of copper(I) ions coordinated by two dmbpy ligands and centrosymmetric, octa-hedral anions of fluorinated early transition metals. The tetra-hedral environments of the copper complexes are distorted owing to the steric effects of the dmbpy ligands. The extended structures are built up through Coulombic inter-actions between cations and anions and π-π stacking inter-actions between heterochiral Δ- and Λ-[Cu(dmbpy)₂]⁺ complexes. A comparison between the title compounds and other [Cu(dmbpy)₂]⁺ compounds with monovalent and bivalent anions reveals a significant influence of the cation-to-anion ratio on the resulting crystal packing architectures, providing insights for future crystal design of distorted tetra-hedral copper compounds.

Crystal structures of [Cu(phen)(H2O)3(MF6)]·H2O (M = Ti, Zr, Hf) and [Cu(phen)(H2O)2F]2[HfF6]·H2O

The crystal structures of three bridged bimetallic mol-ecular compounds, namely, tri-aqua-2κ3 O-μ-fluorido-penta-fluorido-1κ5 F-(1,10-phenanthroline-2κ2 N,N')copper(II)titanium(IV) monohydrate, [Cu(TiF6)(phen)(H2O)3]·H2O (phen is 1,10-phenanthroline, C12H8N2), (I), tri-aqua-2κ3 O-μ-fluorido-penta-fluorido-1κ5 F-(1,10-phenanthroline-2κ2 N,N')copper(II)zirconium(IV) monohydrate, [Cu(ZrF6)(phen)(H2O)3]·H2O, (II), and tri-aqua-2κ3 O-μ-fluorido-penta-fluorido-1κ5 F-(1,10-phenanthroline-2κ2 N,N')copper(II)hafnium(IV) monohydrate, [Cu(HfF6)(phen)(H2O)3]·H2O, (III), and one mol-ecular salt, bis-[diaqua-fluorido-(1,10-phenanthroline-κ2 N,N')copper(II)] hexa-fluorido-hafnate(IV) dihydrate, [CuF(phen)(H2O)2]2[HfF6]·2H2O, (IV), are reported. The bridged bimetallic compounds adopt Λ-shaped configurations, with the octa-hedrally coordinated copper(II) center linked to the fluorinated early transition metal via a fluoride linkage. The extended structures of these Λ-shaped compounds are organized through both intra- and inter-molecular hydrogen bonds and inter-molecular π-π stacking. The salt compound [Cu(phen)(H2O)2F]2[HfF6]·H2O displays an isolated square-pyramidal Cu(phen)(H2O)2F+ complex linked to other cationic complexes and isolated HfF6 2- anions through inter-molecular hydrogen-bonding inter-actions.

Crystal structures of three copper(II)-2,2'-bi-pyridine (bpy) compounds, [Cu(bpy)2(H2O)][SiF6]·4H2O, [Cu(bpy)2(TaF6)2] and [Cu(bpy)3][TaF6]2 and a related coordination polymer, [Cu(bpy)(H2O)2SnF6] n

We report the hydro-thermal syntheses and crystal structures of aqua-bis-(2,2'-bi-pyridine-κ² N,N')copper(II) hexa-fluorido-silicate tetra-hydrate, [Cu(bpy)₂(H₂O)][SiF₆]·4H₂O (bpy is 2,2'-bi-pyridine, C₁₀H₈N₂), (I), bis-(2,2'-bi-pyridine-3κ² N,N')-di-μ-fluorido-1:3κ² F:F;2:3κ² F:F-deca-fluorido-1κ⁵ F,2κ⁵ F-ditantalum(V)copper(II), [Cu(bpy)₂(TaF₆)₂], (II), tris-(2,2'-bi-pyridine-κ² N,N')copper(II) bis[hexa-fluorido-tantalate(V)], [Cu(bpy)₃][TaF₆]₂, (III), and catena-poly[[di-aqua-(2,2'-bi-pyridine-κ² N,N')copper(II)]-μ-fluorido-tetra-fluorido-tin-μ-fluorido], [Cu(bpy)(H₂O)₂SnF₆] _n , (IV). Compounds (I), (II) and (III) contain locally chiral copper coordination complexes with C ₂, D ₂, and D ₃ symmetry, respectively. The extended structures of (I) and (IV) are consolidated by O-H⋯F and O-H⋯O hydrogen bonds. The structure of (III) was found to be a merohedral (racemic) twin.

Synthesis, crystal structure, and thermal properties of poly[aqua-(μ5-2,5-di-carb-oxy-benzene-1,4-di-carboxyl-ato)strontium]

In the title polymer, the eightfold-coordinated Sr^II atoms are linked by bridging (H₂BTEC)^2– anions to generate a two-dimensional network Thermal analysis (TG–SDTA–MS) has been undertaken.

A coordination polymer formulated as [Sr(H₂BTEC)(H₂O)]_n (H₄BTEC = benzene-1,2,4,5-tetra­carb­oxy­lic acid, C₁₀H₆O₈), was synthesized hydro­thermally and characterized by single-crystal and powder X-ray diffraction, scanning electron microscopy and thermal analysis. Its crystal structure is made up of a zigzag inorganic chain formed by edge-sharing of [SrO₈] polyhedra running along [001]. Adjacent chains are connected to each other via the carboxyl­ate groups of the ligand, resulting in a double-layered network extending parallel to (100). O—H⋯O hydrogen bonds of medium-to-weak strength between the layers consolidate the three-dimensional structure. One of the carb­oxy­lic OH functions was found to be disordered over two sets of sites with half-occupancy.

Crystal structure of silver strontium copper orthophosphate, AgSr4Cu4.5(PO4)6

Crystals of the new compound, AgSr4Cu4.5(PO4)6, were grown successfully by the hydro-thermal process. The asymmetric unit of the crystal structure of the title compound contains 40 independent atoms (4 Sr, 4.5 Cu, 1 Ag, 6 P and 24 O), which are all in general positions except for one Cu atom, which is located on an inversion centre. The Cu atoms are arranged in CuO n (n = 4 or 5) polyhedra, linked through common oxygen corners to build a rigid three-dimensional motif. The connection of these copper units is assured by PO4 tetra-hedra. This arrangement allows the construction of layers extending parallel to the (100) plane and hosts suitable cavities in which Ag+ and Sr2+ cations are located. The crystal-structure cohesion is ensured by ionic bonds between the silver and strontium cations and the oxygen anions belonging to two adjacent sheets. Charge-distribution analysis and bond-valence-sum calculations were used to validate the structural model.

A new form of NaMnAsO4

The new form of NaMnAsO₄ (denoted as β) crystallizes in the monoclinic crystal system and is isotypic with one form of NaCoPO₄ and with NaCuAsO₄.

A new form of NaMnAsO₄, sodium manganese(II) orthoarsenate, has been obtained under hydro­thermal conditions, and is referred to as the β-polymorph. In contrast to the previously reported ortho­rhom­bic α-polymorph that crystallizes in the olivine-type of structure and has one manganese(II) cation in a distorted octa­hedral coordination, the current β-polymorph contains two manganese(II) cations in [5]-coordination, inter­mediate between a square-pyramid and a trigonal bipyramid. In the crystal structure of β-NaMnAsO₄, four [MnO₅] polyhedra are linked through vertex- and edge-sharing into finite {Mn₄O₁₆} units strung into rows parallel to [100]. These units are linked through two distinct orthoarsenate groups into a framework structure with channels propagating parallel to the manganese oxide rows. Both unique sodium cations are situated inside the channels and exhibit coordination numbers of six and seven. β-NaMnAsO₄ is isotypic with one form of NaCoPO₄ and with NaCuAsO₄.

Crystal structure of meso-di-μ-chlorido-bis-[bis-(2,2'-bi-pyridine)-cadmium] bis-(1,1,3,3-tetra-cyano-2-ethoxy-propenide) 0.81-hydrate

The hydrated title salt, [Cd2Cl2(C10H8N2)4](C9H5N4O)2·0.81H2O, was obtained from the hydro-thermal reaction between 2,2'-bi-pyridine, cadmium(II) chloride and potassium 1,1,3,3-tetra-cyano-2-eth-oxy-propenide. The binuclear cation lies across a centre of inversion in the space group P21/c, with the other components in general positions. The cation has approximate, but non-crystallographic 2/m symmetry and each of the CdII atoms is a stereogenic centre, one having the Δ configuration and the other the Λ configuration. In the anion, one of the C(CN)2 units is disordered over two sets of atomic sites having occupancies 0.75 (2) and 0.25 (2). The cations are linked by two independent C-H⋯Cl hydrogen bonds to form a sheet of R22(14) and R42(24) rings.

Crystal structure of [tris-(4,4'-bi-pyridine)]-diium bis-(1,1,3,3-tetra-cyano-2-eth-oxy-propenide) trihydrate

The title hydrated salt, C30H26N62+·2C9H5N4O-·3H2O, was obtained as an unexpected product from the hydro-thermal reaction between potassium 1,1,3,3-tetra-cyano-2-eth-oxy-propenide, 4,4'-bi-pyridine and iron(II) sulfate hepta-hydrate. The cation lies across a twofold rotation axis in the space group I2/a with the other components all in general positions. In the cation, the H atom linking the pyridine units is disordered over two adjacent sites having occupancies of 0.66 (4) and 0.36 (4), i.e. as N-H⋯N and N⋯H-N. The water mol-ecules of crystallization are each disordered over two sets of atomic sites, having occupancies of 0.522 (6) and 0.478 (6) for one, and 0.34 (3) and 0.16 (3) for the other, and it was not possible to reliably locate the H atoms associated with these partial-occupancy sites. In the crystal, four independent C-H⋯N hydrogen bonds link the ionic components into a three-dimensional network.

Crystal structure of K0.75[Fe(II) 3.75Fe(III) 1.25(HPO3)6]·0.5H2O, an open-framework iron phosphite with mixed-valent Fe(II)/Fe(III) ions

K_0.7[Fe^II_3.7Fe^III_1.3(HPO₃)₆]·5H₂O was synthesized under mild hydro­thermal conditions. The open-framework phosphite contains channels extending along [001] in which disordered potassium cations and water mol­ecules are located.

Single crystals of the title compound, potassium hexa­phosphito­penta­ferrate(II,III) hemihydrate, K_0.75[Fe^II_3.75Fe^III_1.25(HPO₃)₆]·0.5H₂O, were grown under mild hydro­thermal conditions. The crystal structure is isotypic with Li_1.43[Fe^II_4.43Fe^III_0.57(HPO₃)₆]·1.5H₂O and (NH₄)₂[Fe^II₅(HPO₃)₆] and exhibits a [Fe^II_3.75Fe^III_1.25(HPO₃)₆]^0.75− open framework with disordered K⁺ (occupancy 3/4) as counter-cations. The anionic framework is based on (001) sheets of two [FeO₆] octa­hedra (one with point group symmetry 3.. and one with point group symmetry .2.) linked along [001] through [HPO₃]²⁻ oxoanions. Each sheet is constructed from 12-membered rings of edge-sharing [FeO₆] octa­hedra, giving rise to channels with a radius of ca 3.1 Å where the K⁺ cations and likewise disordered water mol­ecules (occupancy 1/4) are located. O⋯O contacts between the water mol­ecule and framework O atoms of 2.864 (5) Å indicate hydrogen-bonding inter­actions of medium strength. The infrared spectrum of the compound shows vibrational bands typical for phosphite and water groups. The Mössbauer spectrum is in accordance with the presence of Fe^II and Fe^III ions.

Crystal structure of CdSO4(H2O): a redetermination

The crystal structure of the title compound, cadmium sulfate monohydrate or poly[(μ₂-aqua)(μ₄-sulfato)­cadmium], was redetermined based on modern CMOS (complementary metal oxide silicon) data. In comparison with the previous study [Bregeault & Herpin (1970 ▸). Bull. Soc. Fr. Mineral. Cristallogr.93, 37–42], all non-H atoms were refined with anisotropic displacement parameters and the hydrogen-bonding pattern unambiguously established due to location of the hydrogen atoms. In addition, a significant improvement in terms of precision and accuracy was achieved. In the crystal, the Cd²⁺ cation is coordinated by four O atoms of four sulfate anions and two O atoms of water mol­ecules, forming a distorted octa­hedral trans-[CdO₆] polyhedron. Each sulfate anion bridges four Cd²⁺ cations and each water mol­ecule bridges two Cd²⁺ cations, leading to the formation of a three-dimensional framework, with Cd⋯Cd separations in the range 4.0757 (2)–6.4462 (3) Å. O—H⋯O hydrogen-bonding inter­actions of medium strength between the coordinating water mol­ecules and sulfate anions consolidate the crystal packing.

Crystal structure of alluaudite-type NaMg3(HPO4)2(PO4)

The title compound, sodium trimagnesium bis-(hydrogen phosphate) phosphate, was obtained under hydro-thermal conditions. In the crystal, two types of [MgO6] octa-hedra, one with point group symmetry 2, share edges to build chains extending parallel to [10-1]. These chains are linked together by two kinds of phosphate tetra-hedra, HPO4 and PO4, the latter with point group symmetry 2. The three-dimensional framework delimits two different types of channels extending along [001]. One channel hosts the Na(+) cations (site symmetry 2) surrounded by eight O atoms, with Na-O bond lengths varying between 2.2974 (13) and 2.922 (2) Å. The OH group of the HPO4 tetra-hedron points into the other type of channel and exhibits a strong hydrogen bond to an O atom of the PO4 tetra-hedron on the opposite side.

Crystal structure of a new homochiral one-dimensional zincophosphate containing l-me-thio-nine

[Zn(HPO₄)(l-met)]_n is a rare example of a one-dimensional zincophosphate compound with a homochiral structure. Ladder-like chains of alternating ZnO₄ and (HO)PO₃ tetra­hedra are bedecked on each side by zwitterionic l-me­thio­nine ligands, which inter­act with the inorganic framework via Zn—O coordination bonds.

catena-Poly[[(l-me­thio­nine-κO)zinc]-μ₃-(hydrogen phosphato)-κ³O:O′:O′′], [Zn{PO₃(OH)}(C₅H₁₁NO₂S)]_n, a new one-dimensional homochiral zincophos­phate, was hydro­thermally synthesized using l-me­thio­nine as a structure-directing agent. The compound consists of a network of ZnO₄ and (HO)PO₃ tetra­hedra that form ladder-like chains of edge-fused Zn₂P₂O₄ rings propagating parallel to [100]. The chains are decorated on each side by zwitterionic l-me­thio­nine ligands, which inter­act with the inorganic framework via Zn—O coordination bonds. The structure displays inter­chain N—H⋯O and O—H⋯S hydrogen bonds.

Redetermination of the crystal structure of β-zinc molybdate from single-crystal X-ray diffraction data

The crystal structure of the β-polymorph of ZnMoO4 was re-determined on the basis of single-crystal X-ray diffraction data. In comparison with previous powder X-ray diffraction studies [Katikaneani & Arunachalam (2005 ▸). Eur. J. Inorg. Chem. pp. 3080-3087; Cavalcante et al. (2013 ▸). Polyhedron, 54, 13-25], all atoms were refined with anisotropic displacement parameters, leading to a higher precision with respect to bond lengths and angles. β-ZnMoO4 adopts the wolframite structure type and is composed of distorted ZnO6 and MoO6 octa-hedra, both with point group symmetry 2. The distortion of the octa-hedra is reflected by variation of bond lengths and angles from 2.002 (3)-2.274 (4) Å, 80.63 (11)-108.8 (2)° for equatorial and 158.4 (2)- 162.81 (14)° for axial angles (ZnO6), and of 1.769 (3)-2.171 (3) Å, 73.39 (16)-104.7 (2), 150.8 (2)-164.89 (15)° (MoO6), respectively. In the crystal structure, the same type of MO6 octa-hedra share edges to built up zigzag chains extending parallel to [001]. The two types of chains are condensed by common vertices into a framework structure. The crystal structure can alternatively be described as derived from a distorted hexa-gonally closed packed arrangement of the O atoms, with Zn and Mo in half of the octa-hedral voids.

Crystal structure of NH4[La(SO4)2(H2O)]

The structure of (NH₄)[La(SO₄)₂(H₂O)] comprises LaO₉ polyhedra and SO₄ tetra­hedra, which are linked by common edges and vertices, forming a three-dimensional network with the hydrogen-bonded NH₄⁺ ions in the cavities.

The principal building units in the crystal structure of ammonium aqua­bis(sulfato)­lanthanate(III) are slightly distorted SO₄ tetra­hedra, LaO₉ polyhedra in the form of distorted tricapped trigonal prisms, and NH₄⁺ ions. The La³⁺ cation is coordinated by eight O atoms from six different sulfate tetra­hedra, two of which are bidentate coordinating and four monodentate, as well as one O atom from a water mol­ecule; each sulfate anion bridges three La³⁺ cations. These bridging modes result in the formation of a three-dimensional anionic [La(SO₄)₂(H₂O)]⁻ framework that is stabilized by O—H⋯O hydrogen-bonding inter­actions. The disordered ammonium cations are situated in the cavities of this framework and are hydrogen-bonded to six surrounding O atoms.

Hydro-thermal synthesis and crystal structure of a new lanthanum(III) coordination polymer with fumaric acid

The title compound, poly[di-aqua-tris-(μ4-but-2-enedioato)(μ2-but-2-enedioic acid)dilanthanum(III)], [La2(C4H2O4)3(C4H4O4)(H2O)2] n , was synthesized by the reaction of lanthanum chloride penta-hydrate with fumaric acid under hydro-thermal conditions. The asymmetric unit comprises an La(III) cation, one and a half fumarate dianions (L (2-)), one a half-mol-ecule of fumaric acid (H2 L) and one coordinated water mol-ecule. Each La(III) cation has the same nine-coordinate environment and is surrounded by eight O atoms from seven distinct fumarate moieties, including one proton-ated fumarate unit and one water mol-ecule in a distorted tricapped trigonal-prismatic environment. The LaO8(H2O) polyhedra centres are edge-shared through three carboxyl-ate bridges of the fumarate ligand, forming chains in three dimensions to construct the MOF. The crystal structure is stabilized by O-H⋯O hydrogen-bond inter-actions between the coordin-ated water mol-ecule and the carboxyl-ate O atoms, and also between oxygen atoms of fumaric acid.

Crystal structure of dimanganese(II) zinc bis-[ortho-phosphate(V)] monohydrate

The title compound, Mn2Zn(PO4)2·H2O, was obtained under hydro-thermal conditions. The structure is isotypic with other transition metal phosphates of the type M 3- xM' x (PO4)2·H2O, but shows no statistical disorder of the three metallic sites. The principal building units are distorted [MnO6] and [MnO5(H2O)] octa-hedra, a distorted [ZnO5] square pyramid and two regular PO4 tetra-hedra. The connection of the polyhedra leads to a framework structure. Two types of layers parallel to (-101) can be distinguished in this framework. One layer contains [Zn2O8] dimers linked to PO4 tetra-hedra via common edges. The other layer is more corrugated and contains [Mn2O8(H2O)2] dimers and [MnO6] octa-hedra linked together by common edges. The PO4 tetra-hedra link the two types of layers into a framework structure with channels parallel to [101]. The H atoms of the water mol-ecules point into the channels and form O-H⋯O hydrogen bonds (one of which is bifurcated) with framework O atoms across the channels.

Crystal structure of magnesium copper(II) bis-[orthophosphate(V)] monohydrate

The crystal structure of magnesium copper(II) bis­[orthophosphate(V)] monohydrate is formed by three types of cationic sites and by two unique (PO₄)³⁻ anions. One site is occupied by Cu²⁺, the second site by Mg²⁺and the third site by a mixture of the two cations with an Mg²⁺:Cu²⁺ occupancy ratio of 0.657 (3):0.343 (3).

Single crystals of magnesium copper(II) bis­[orthophosphate(V)] monohydrate, Mg_1.65Cu_1.35(PO₄)₂·H₂O, were grown under hydro­thermal conditions. The crystal structure is formed by three types of cationic sites and by two unique (PO₄)³⁻ anions. One site is occupied by Cu²⁺, the second site by Mg²⁺and the third site by a mixture of the two cations with an Mg²⁺:Cu²⁺ occupancy ratio of 0.657 (3):0.343 (3). The structure is built up from more or less distorted [MgO₆] and [(Mg/Cu)O₅(H₂O)] octa­hedra, [CuO₅] square-pyramids and regular PO₄ tetra­hedra, leading to a framework structure. Within this framework, two types of layers parallel to (-101) can be distinguished. The first layer is formed by [Cu₂O₈] dimers linked to PO₄ tetra­hedra via common edges. The second, more corrugated layer results from the linkage between [(Cu/Mg)₂O₈(H₂O)₂] dimers and [MgO₆] octa­hedra by common edges. The PO₄ units link the two types of layers, leaving space for channels parallel [101], into which the H atoms of the water mol­ecules protrude. The latter are involved in O—H⋯O hydrogen-bonding inter­actions (one bifurcated) with framework O atoms across the channels.

Crystal structure of bis-(propane-1,3-diaminium) hexa-fluorido-aluminate di-aqua-tetra-fluorido-aluminate tetra-hydrate

In the crystal structure of bis­(propane-1,3-di­ammonium) hexa­fluorido­aluminate di­aqua­tetra­fluorido­aluminate tetra­hydrate, two different environments of the Al³⁺ cations are observed, namely, AlF₆ and AlF₄(H₂O)₂.

The title compound, (C₃H₁₂N₂)₂[AlF₆][AlF₄(H₂O)₂]·4H₂O, was obtained by a solvothermal method in ethanol as solvent and with aluminium hydroxide, HF and 1,3-di­amino­propane as educts. The asymmetric unit contains a quarter each of two crystallographically independent propane-1,3-di­ammonium dicat­ions, [AlF₆]³⁻ and [AlF₄(H₂O)₂]⁻ anions and four water mol­ecules. The cations, anions and three of the independent water mol­ecules are situated on special positions mm, while the fourth water mol­ecule is disordered about a mirror plane. In the crystal, inter­molecular N—H⋯F and O—H⋯F hydrogen bonds link the cations and anions into a three-dimensional framework with the voids filled by water mol­ecules, which generate O—H⋯O hydrogen bonds and further consolidate the packing.