A new chiral rare-earth organic framework constructed by tartaric acid: synthesis, structural, thermal investigations and optical properties.

Hydrothermal reactions of rare-earth cerium with L-tartaric acid afford a new coordination polymer, namely, poly[[triaqua(μ-L-tartrato)cerium(III)] chloride], {[Ce(CHO)(HO)]Cl}, (1). The structure was determined by single-crystal X-ray diffraction analysis and further characterized by IR and UV-Vis spectroscopy, powder X-ray diffraction and thermogravimetric analysis. Single-crystal X-ray diffraction analysis revealed that the compound is a new two-dimensional (2D) double-layered structure with one-dimensional left-handed helical chains.

Alkali and alkaline earth coordination polymers constructed from benzene-1,2,4,5-tetracarboxylic acid and flexible dicarboxylate acid ligands: syntheses, structures and spectroscopic and thermal properties.

Two new metal coordination complexes, namely, poly[aqua(μ-benzene-1,2,4,5-tetracarboxylic acid-κO:O,O:O:O:O,O:O)(μ-but-2-enedioato-κO:O)potassium(I)], [K(CHO)(CHO)(HO)] or [K(fum)(Hbtec)(HO)], (1), and poly[aqua(μ-2,5-dicarboxybenzene-1,4-dicarboxylato-κO:O,O:O,O:O:O:O,O:O,O:O)(μ-ethanedioato-κO,O:O,O)strontium(II)], [Sr(CO)(CHO)(HO)] or [Sr(ox)(Hbtec)(HO)], (2) (Hbtec = benzene-1,2,4,5-tetracarboxylic acid, Hbtec = 2,5-dicarboxybenzene-1,4-dicarboxylate, fum = fumarate and ox = oxalate), have been obtained under hydrothermal conditions by reacting the different alkali and alkaline earth metal salts with Hbtec, fumaric acid (Hfum) and oxalic acid (Hox). Complexes (1) and (2) were structurally characterized by single-crystal X-ray diffraction, IR and UV-Vis spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetic analysis-differential scanning calorimetry (TGA-DSC). Complex (1) displays a two-dimensional (2D) layer with the K ion in a distorted pentagonal bipyramidal geometry and exhibits a uninodal 6-connected hxl/Shubnikov plane net (3,6) with {3.

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

A coordination polymer formulated as [Sr(HBTEC)(HO)] (HBTEC = benzene-1,2,4,5-tetra-carb-oxy-lic acid, CHO), was synthesized hydro-thermally 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 [SrO] polyhedra running along [001]. Adjacent chains are connected to each other the carboxyl-ate groups of the ligand, resulting in a double-layered network extending parallel to (100).

Two novel alkaline earth coordination polymers constructed from cinnamic acid and 1,10-phenanthroline: synthesis and structural and thermal properties.

In coordination chemistry and crystal engineering, many factors influence the construction of coordination polymers and the final frameworks depend greatly on the organic ligands used. The diverse coordination modes of N-donor ligands have been employed to assemble metal-organic frameworks. Carboxylic acid ligands can deprotonate completely or partially when bonding to metal ions and can also act as donors or acceptors of hydrogen bonds; they are thus good candidates for the construction of supramolecular architectures.

A novel three-dimensional Sr coordination polymer based on benzene-1,2,4,5-tetracarboxylate: hydrothermal synthesis, crystal structure and spectroscopic and thermal studies.

Coordination of the anions of benzenecarboxylic acids with metal cations leads to coordination polymers with various structural features. Very few examples of strontium-based structures have been reported. A new three-dimensional coordination polymer, namely poly[aqua(μ-benzene-1,2,4,5-tetracarboxylato)distrontium(II)], [Sr(CHO)(HO)], has been synthesized under hydrothermal conditions and characterized by thermal analysis, vibrational spectroscopy (Raman and IR), single-crystal X-ray diffraction and powder X-ray diffraction.

catena-Poly[bis(1,3-benzo-thia-zol-3-ium) [[di-chlorido-anti-monate(III)]-di-μ-chlorido-μ-oxido-[chlorido-anti-monate(III)]-μ-chlorido]].

The title compound, {(C7H6NS)2[Sb2Cl6O]} n , contains two benzo-thia-zolidium cations and one tri-μ-chlorido-tri-chlorido-μ-oxido-di-anti-monate(III) anion. The structure of the inorganic cation may be described as as being built up from two polyhedra, i.e.

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.

Crystal structure of bis-(9H-6-amino-purin-1-ium) hexa-fluorido-silicate(IV) dihydrate.

The asymmetric unit of the title compound, 2C5H6N5 (+)·SiF6 (2-)·2H2O, contains one adeninium cation, half of a hexa-fluorido-silicate anion located on an inversion centre and one lattice water mol-ecule. The adeninium cations are connected through N-H⋯N hydrogen bonds involving one H atom of the -NH2 group and the H atom of the protonated N atom of the adenine ring system, forming centrosymmetric ring motifs of the type R 2 (2)(10) and R 2 (2)(8), respectively. The overall connection of the cation leads to the formation of planar ribbons parallel to (122).

Poly[[penta-aqua-bis-(μ3-hydrogen squarato)barium] monohydrate].

The crystal structure of the title compound, {[Ba(C4HO4)2(H2O)5]·H2O} n , consists of discrete double chains propagating along [010]. The chains are formed by Ba(II) ions linked by bridging hydrogen squarate ligands in a trans-bis-monodentate mode. In addition, the bridging hydrogen squarate ligands connect the chains into a ladder structure via a third coordinating O atom.

Poly[1H-imidazol-3-ium [di-μ-nitrato-sodium]].

In the title compound {(C3H5N2)[Na(NO3)2]} n , the Na(I) ion is coordinated by eight O atoms from three bidentate nitrate anions and two O atoms from two monodentate nitrate anions, displaying a bicapped trigonal-prismatic geometry. The imidazolium cation is essentially planar (r.m.

(±)-Bis(1-carb-oxy-2-phenyl-ethanaminium) hexa-fluoro-silicate(VI).

The asymmetric unit of the title fluoro-silicate salt, 2C(9)H(12)NO(2) (+)·SiF(6) (2-), consists of a phenylalaninium cation and half of a fluorosilicate anion, the Si atom being located on an inversion center. In the crystal, all of the F atoms act as hydrogen-bond acceptors and link the cations through different graph-set motifs, forming layers developing parallel to (100).

Poly[[μ-aqua-tetraaquabis(μ-2-hydroxy-4-oxocyclobut-1-ene-1,3-diolato)strontium] hemihydrate].

In the title coordination polymer, {[Sr(C(4)HO(4))(2)(H(2)O)(5)]·0.5H(2)O}(n), the Sr(2+) ion is coordinated by three monodentate hydrogensquarate (hsq) anions and six aqua ligands in a distorted SrO(9) monocapped square-anti-prismatic geometry. The hsq anions and water mol-ecules bridge the metal ions into infinite sheets lying parallel to (100).

Tris(piperazine-1,4-diium) bis-[hexa-chloridoindate(III)] tetra-hydrate.

The asymmetric unit of the title compound, (C(4)H(12)N(2))(3)[InCl(6)](2)·4H(2)O, consists of one and half independent piperazinium cations, an hexa-chloridoindate anion and two mol-ecules of water. The In(III) ion is six-coordinated and forms a quasi-regular octa-hedral arrangement. In the crystal, alternating layers of cations and anions are arranged parallel to (10[Formula: see text]) and are linked with the water mol-ecules via intra- and inter-molecular N-H⋯O, O-H⋯Cl, C-H⋯O and N-H⋯Cl hydrogen bonds, forming a complex three-dimensional network.

catena-Poly[[{bis-[tetra-aqua-(2-hy-droxy-3,4-dioxocyclo-but-1-en-1-olato-κO)bariumstrontium(0.35/0.65)]di-μ-aqua}-bis-(μ-2-hy-droxy-4-oxocyclo-but-1-ene-1,3-diolato-κO:O)] monohydrate].

The title structure, {[Ba(0.71)Sr(1.29)(C(4)HO(4))(4)(H(2)O)(10)]·H(2)O}(n), is built from dimers of edge-sharing monocapped square anti-prisms [(Ba/Sr)O(3)(H(2)O)(6)], in which barium and strontium are statistically disordered [ratio 0.

Bis(cytosinium) aqua-penta-chlorido-indate(III).

The asymmetric unit of the title compound, (C(4)H(6)N(3)O)(2)[InCl(5)(H(2)O)], comprises two independent cytosinium cations and an aquapentachloridoindate anion. The In(III) ion is in a slightly distorted octa-hedral coordination geometry. In the crystal, alternating layers of cations and anions are arranged along [010] and are linked via inter-molecular N-H⋯O, O-H⋯Cl and N-H⋯Cl hydrogen bonds, forming sheets parallel to (001).