Synthesis, structure and magnetocaloric properties of a new two-dimensional gadolinium(III) coordination polymer based on azobenzene-2,2',3,3'-tetracarboxylic acid.

A new Gd coordination polymer (CP), namely, poly[diaqua[μ-1'-carboxy-3,3'-(diazene-1,2-diyl)dibenzene-1,2,2'-tricarboxylato]gadolinium(III)], [Gd(CHNO)(HO)], (I), has been synthesized hydrothermally from Gd(NO)·6HO and azobenzene-2,2',3,3'-tetracarboxylic acid (Habtc). The target solid has been characterized by single-crystal and powder X-ray diffraction, elemental analysis, IR spectroscopy and susceptibility measurements. CP (I) crystallizes in the monoclinic space group C2/c.

A novel three-dimensional tetranuclear Co coordination polymer with water hexamers based on the V-shaped tetracarboxylate ligand 4-(2,4-dicarboxylatophenoxy)phthalate.

A new coordination polymer (CP), namely, poly[[diaquatris[μ-1,4-bis(1H-imidazol-1-yl)benzene]bis[μ-4-(2,4-dicarboxylatophenoxy)phthalato]tetracobalt(II)] hexahydrate], {[Co(CHO)(CHN)(HO)]·6HO}, has been synthesized by solvothermal reaction. The CP was fully characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis, and powder and single-crystal X-ray diffraction. It presents a three-dimensional (3D) structure based on tetranuclear Co secondary building units (SBUs) with a tfz-d net and point symbol (4)(4·6·8).

A new family of lanthanide coordination polymers based on 3,3'-[(5-carboxylato-1,3-phenylene)bis(oxy)]dibenzoate: synthesis, crystal structures and magnetic and luminescence properties.

Six two-dimensional (2D) coordination polymers (CPs), namely, poly[{μ-3,3-[(5-carboxylato-1,3-phenylene)bis(oxy)]dibenzoato-κO:O:O,O:O:O}bis(N,N-dimethylformamide-κO)lanthanide(III)], [Ln(CHO)(CHNO)], with lanthanide/Ln = cerium/Ce for CP1, praseodymium/Pr for CP2, neodymium/Nd for CP3, samarium/Sm for CP4, europium/Eu for CP5 and gadolinium/Gd for CP6, have been prepared by solvothermal methods using the ligand 3,3'-[(5-carboxy-1,3-phenylene)bis(oxy)]dibenzoic acid (Hcpboda) in the presence of Ln(NO). The complexes were characterized by single-crystal X-ray and powder diffraction, IR spectroscopy, elemental analysis and thermogravimetric analysis (TGA). All the structures of this family of lanthanide CPs are isomorphous with the triclinic space group P-1 and reveal that they have the same 2D network based on binuclear Ln units, which are further extended via interlayer C-H.

Structural diversity, magnetic properties and luminescence of Ni, Co and Zn coordination polymers derived from 3,3'-[(5-carboxy-1,3-phenylene)bis(oxy)]dibenzoic acid and 1,10-phenanthroline.

Three novel coordination polymers (CPs), namely poly[[di-μ-aqua-bis{μ-3,3'-[(5-carboxylato-1,3-phenylene)bis(oxy)]dibenzoato-κO:O,O:O:O}bis(1,10-phenanthroline-κN,N')trinickel(II)] dimethylformamide 1.5-solvate trihydrate], {[Ni(CHO)(CHN)(HO)]·1.5CHNO·3HO}, (I), poly[[di-μ-aqua-bis{μ-3,3'-[(5-carboxylato-1,3-phenylene)bis(oxy)]dibenzoato-κO:O,O:O:O}bis(1,10-phenanthroline-κN,N')tricobalt(II)] diethylamine disolvate tetrahydrate], {[Co(CHO)(CHN)(HO)]·2CHN·4HO}, (II), and catena-poly[[aqua(1,10-phenanthroline-κN,N')zinc(II)]-μ-5-(3-carboxyphenoxy)-3,3'-oxydibenzoato-κO:O], [Zn(CHO)(CHN)(HO)], (III), have been synthesized by the reaction of different metal ions (Ni, Co and Zn), 3,3'-[(5-carboxy-1,3-phenylbis(oxy)]dibenzoic acid (Hcpboda) and 1,10-phenanthroline (phen) under solvothermal conditions.

Luminescent and magnetic bifunctional coordination complex based on a chiral tartaric acid derivative and europium.

A new mononuclear europium complex incorporating the (+)-di-p-toluoyl-D-tartaric acid (D-HDTTA) ligand, namely, catena-poly[tris{μ-3-carboxy-2,3-bis[(4-methylphenyl)carbonyloxy]propanoato}tris(methanol)europium(III)], [Eu(CHO)(CHOH)], (I), has been synthesized and characterized by IR spectroscopy, elemental analysis, powder X-ray diffraction and single-crystal X-ray diffraction analysis. The structure analysis indicates that complex (I) crystallizes in the trigonal space group R3 and exhibits an infinite one-dimensional chain structure, in which the Eu ion is surrounded by six O atoms from six D-HDTTA ligands and three O atoms from three coordinated methanol molecules, thus forming a tricapped trigonal prism geometry. The D-HDTTA ligand is partially deprotonated and adopts a μ-coordination mode via two carboxylate groups to link adjacent Eu ions, affording an infinite one-dimensional propeller-shaped coordination polymer chain along the c axis, with an Eu.

Structural diversity, magnetic property, or luminescence sensing of Co(ii) and Cd(ii) coordination polymers derived from designed 3,3'-((5-carboxy-1,3-phenylene)bis(oxy))dibenzoic acid.

Five novel coordination polymers (CPs), formulated as {[Co(μ-cpboda)(μ-OH)(2,2-bipy)]·1.5DMF·2HO} (1), {[Co(μ-cpboda)(4,4'-bpy)(HO)]·4HO} (2), {[Co(μ-Hcpboda)(1,4-bib)(HO)]·HO·DMF·1.5HCOOH} (3), [Cd(μ-Hcpboda)(1,4-bib)] (4), and {[Cd(μ-cpboda)(μ-OH)(phen)]·2DMF·1.

A thermally stable three-dimensional cobalt(II) coordination polymer based on the V-shaped ligand 4-(4-carboxyphenoxy)isophthalate.

A new cobalt(II) coordination polymer (CP), poly[[bis[μ-4-(4-carboxylatophenoxy)benzene-1,3-dicarboxylato-κO:O:O:O:O:O]bis(1,10-phenanthroline-κN,N')tricobalt(II)] 0.72-hydrate], {[Co(CHO)(CHN)]·0.72HO}, (I), is constructed from Co ions and 4-(4-carboxyphenoxy)isophthalate (cpoia) and 1,10-phenanthroline (phen) ligands.

A three-dimensional twofold interpenetrated cobalt(II) MOF containing a flexible carboxylate-based ligand: synthesis, structure and magnetic properties.

The design and synthesis of coordination polymers (CPs) have attracted much interest due to the intriguing diversity of their architectures and topologies. The functional solid catena-poly[μ-aqua-triaqua{μ-5-[4-carboxyphenoxy)methyl]benzene-1,3-dicarboxylato}{μ-5-[4-carboxyphenoxy)methyl]benzene-1,3-dicarboxylato}dicobalt(II)], [Co(CHO)(HO)] or [Co(HL)(μ-HO)(HO)], was synthesized successfully by self-assembly of Co ions with 5-[(4-carboxyphenoxy)methyl]isophthalic acid (HL). The title compound was obtained under hydrothermal conditions and exhibits a twofold interpenetrated three-dimensional skeleton with hms 3,5-conn topology according to the cluster representation for valence-bonded metal-organic frameworks (MOFs).

Synthesis, crystal structure and characterization of a three-dimensional Cd coordination polymer constructed from 2,5-bis(1H-1,2,4-triazol-1-yl)terephthalate.

Bifunctional organic ligands are very popular for the design of coordination polymers because they allow the formation of a great diversity of structures. In the title coordination polymer, the new bifunctional inversion-symmetric ligand 2,5-bis(1H-1,2,4-triazol-1-yl)terephthalic acid (abbreviated as Hbttpa) links Cd cations, giving rise to the three-dimensional Cd coordination polymer catena-poly[diaqua[μ-2,5-bis(1H-1,2,4-triazol-1-yl)terephthalato-κO:O:N:N]cadmium(II)], [Cd(CHNO)(HO)] or [Cd(bttpa)(HO)]. The asymmetric unit consists of half a Cd cation, half a bttpa ligand and one coordinated water molecule.

A new family of 1D, 2D and 3D frameworks aggregated from Ni5, Ni4 and Ni7 building units: synthesis, structure, and magnetism.

Three new Ni(ii)-clusters based on a Y-shaped ligand (biphenyl-3,4',5-tricarboxylate, H3BPT), [Ni5(HBPT)4(OH)2(H2O)12]n (), [Ni4(BPT)2(OH)2(H2O)6]n·4nH2O (), and [Ni7(BPT)2(1,4-bib)2(OH)6(HCO2)2]n·3nH2O () (1,4-bib = 1,4-bi(1H-imidazol-1-yl)benzene), have been synthesized under solvothermal conditions. They were studied by infrared spectroscopy (IR), single crystal X-ray diffraction, thermogravimetric analysis (TGA), and magnetochemistry. The complexes contain low nuclear Ni-clusters as building units (BUs).

A three-dimensional mixed-valence Cu(II)/Cu(I) coordination polymer constructed from biphenyl-3,4',5-tricarboxylate and 1,4-bis(1H-imidazol-1-yl)benzene ligands.

Coordination polymers (CPs) built by coordination bonds between metal ions/clusters and multidentate organic ligands exhibit fascinating structural topologies and potential applications as functional solid materials. The title coordination polymer, poly[diaquabis(μ4-biphenyl-3,4',5-tricarboxylato-κ(4)O(3):O(3'):O(4'):O(5))tris[μ2-1,4-bis(1H-imidazol-1-yl)benzene-κ(2)N(3):N(3')]dicopper(II)dicopper(I)], [Cu(II)2Cu(I)2(C15H7O6)2(C12H10N4)3(H2O)2]n, was crystallized from a mixture of biphenyl-3,4',5-tricarboxylic acid (H3bpt), 1,4-bis(1H-imidazol-1-yl)benzene (1,4-bib) and copper(II) chloride in a water-CH3CN mixture under solvothermal reaction conditions. The asymmetric unit consists of two crystallographically independent Cu atoms, one of which is Cu(II), while the other has been reduced to the Cu(I) ion.

4-[(5-Bromo-2-hy-droxy-benzyl-idene)amino]-3-ethyl-1H-1,2,4-triazole-5(4H)-thione.

The title compound, C11H11BrN4OS, crystallized as a racemic twin with two symmetry-independent mol-ecules in the asymmetric unit. The dihedral angles between the benzene and triazole rings of the two independent mol-ecules are 56.41 (18) and 54.

4-Bromo-2-[(phenyl-imino)-meth-yl]phenol.

The title compound, C13H10BrNO, is essentially planar (r.m.s.

4-[(5-Chloro-2-hy-droxy-benzyl-idene)amino]-3-ethyl-1H-1,2,4-triazole-5(4H)-thione.

The title compound, C11H11ClN4OS, crystallizes with two mol-ecules, A and B, in the asymmetric unit in which the dihedral angles between the triazole and benzene rings are 54.6 (3) and 56.0 (3)°.

2-[(E)-(4-Bromo-phenyl)imino-methyl]-4-chloro-phenol.

In the title compound, C13H9BrClNO, the dihedral angle between the substituted benzene rings is 44.25 (11)°. There are strong intra-molecular O-H⋯N hydrogen bonds, which generate S(6) rings, and also inter-molecular Cl⋯Cl [3.

Analogy to a Chinese knot in an ion-pair copper(II)-neodymium(III) complex based on a hexadentate Schiff base condensation product of 5-bromosalicylaldehyde and glycylglycine.

Self-assembly of CuCl2, NdCl3, 5-bromosalicylaldehyde and glycylglycine yields the ion-pair copper(II)-neodymium(III) complex, poly[[decaaquabis[μ3-2-({2-[(5-bromo-2-oxidobenzylidene)amino]acetyl}azanidyl)acetato]bis[μ2-2-({2-[(5-bromo-2-oxidobenzylidene)amino]acetyl}azanidyl)acetato]tetracopper(II)dineodymium(III)] bis{[2-({2-[(5-bromo-2-oxidobenzylidene)amino]acetyl}azanidyl)acetato]cuprate(II)} tetradecahydrate], {[Cu4Nd2(C11H8BrN2O4)4(H2O)10][Cu(C11H8BrN2O4)]2·14H2O}n. The anion is planar and mononuclear, showing an approximately square-planar coordination of the metal atom, while the cation is a hexanuclear centrosymmetric transition metal-lanthanide (Cu-Nd) heterometallic complex, with the independent copper cations in square-planar and square-pyramidal coordinations. The asymmetric unit comprises one half of this cation, one anion and seven solvent water molecules.

4-[(5-Bromo-2-hy-droxy-benzyl-idene)amino]-3-propyl-1H-1,2,4-triazole-5(4H)-thione.

The asymmetric unit of the title compound, C(12)H(13)BrN(4)OS, contains two independent mol-ecules in which the dihedral angles between the triazole and benzene rings are 2.9 (3) and 7.5 (3)°.

The crucial role of C-H...O and C=O...pi interactions in the building of three-dimensional structures of dicarboxylic acid-biimidazole compounds.

The supramolecular architectures of three dicarboxylic acid-biimidazole compounds, namely, 2,2'-biimidazolium malonate, C(6)H(8)N(4)(2+).C(3)H(2)O(4)(2-), (I), 2,2'-bi(1H-imidazole) succinic acid, C(6)H(6)N(4).C(4)H(6)O(4), (II), and 2,2'-biimidazolium 2,2'-iminiodiacetate chloride, C(6)H(8)N(4)(2+).

Imidazolium trans-bis-(imino-diacetato-κO,N,O')cobaltate(III).

In the title compound, (C(3)H(5)N(2))[Co(C(4)H(5)NO(4))(2)], the cation and anion are located on a twofold rotation axis and inversion center, respectively. Inter-molecular N-H⋯O hydrogen bonds link the cations and anions into layers parallel to the ab plane. The crystal packing also exhibits weak C-H⋯O hydrogen bonds, including bifurcated hydrogen bonds, and C=O⋯π inter-actions.

(μ-Acetato){μ-1,3-bis[2-(2-oxidobenzylideneamino)ethyl]-2-(2-oxidophenyl)-1,3-imidazolidine}dizinc(II) ethanol disolvate dihydrate.

In the title binuclear compound, [Zn(2)(C(27)H(27)N(4)O(3))(C(2)H(3)O(2))]·2CH(3)CH(2)OH·2H(2)O, both Zn cations adopt distorted ZnO(3)N(2) trigonal-bipyramidal geometries with one N atom in a axial site and one N atom in an equatorial site, arising from coordination by the N,N,N,N,O,O,O-hepta-dentate ligand and a bridging acetate ion. In the crystal, inter-molecular O-H⋯O hydrogen bonds link the component units into a three-dimensional network. Two short C-H⋯O contacts are also seen.

Bis(2,4,6-triamino-1,3,5-triazin-1-ium) hydrogen phosphate trihydrate.

In the title hydrated mol-ecular salt, 2C(3)H(7)N(6) (+)·HPO(4) (2-)·3H(2)O, three of the O atoms of the hydrogen phosphate anion are disordered over two positions, with relative occupancies of 0.763 (1) and 0.237 (1).

2-(Hydrazonomethyl)phenol.

The conformation of the title compound, C(7)H(8)N(2)O, is stabilized by an intra-molecular O-H⋯N hydrogen bond. The crystal structure shows inter-molecular N-H⋯O hydrogen bonds.

Bis(2,2'-bi-1H-imidazole-κN,N)(thio-cyanato-κN)copper(II) chloride.

In the title salt, [Cu(NCS)(C(6)H(6)N(4))(2)]Cl, the Cu(II) atom adopts a five-coordinated square-pyramidal geometry consisting of an N atom from a thio-cyanate anion and four N atoms from two chealting biimidazole ligands. The thio-cyanate ligand occupies the axial position and is, like the Cu(II) centre, located on a mirror plane. The cation and anion are linked into a linear chain by N-H⋯S and N-H⋯Cl hydrogen bonds.