Xiao-Lin Qin

catena-Poly[[triaquacopper(II)]-μ2-furan-2,5-dicarboxyl­ato-κ4O1,O2:O2,O2′]

In the title compound, [Cu(C6H2O5)(H2O)3]n, an infinite chain is formed along [001] by linking of the Cu(OH2)3O4 cluster with one carboxylate group of the furan-2,5-dicarboxylate ligand. Adjacent chains are linked by Owater—H⋯O hydrogen-bonding interactions. The Cu(OH2)3O4 cluster displays a pentagonal bipyrimadal geometry with two weak coordinations [Cu—Ofuran = 2.790 (2) Å) and Cu—Ocarboxylate = 2.684 (2) Å] and two water molecules located in axial positions.

catena-Poly[(triaqua-zinc)-μ-furan-2,5-dicarboxyl-ato-κ(3)O(2):O(2),O(2')].

In the crystal structure of the title compound, [Zn(C6H2O5)(H2O)3]n, an infinite chain is formed along [001] by linking of the Zn(H2O)3 entities with one carboxylate group of the furan-2,5-dicarboxylate ligand. Adjacent chains are linked by Owater—H⋯O hydrogen-bonding interactions. The Zn(H2O)3O3 polyhedron displays a distorted octahedral geometry with one weak Zn—Ocarboxylate coordination [2.433 (8) A°] and two water molecules located in axial positions. Except for one of the axial water molecules and two adjacent H atoms, the other atoms (including H atoms) possess site symmetry m.

catena-Poly[[[aqua­bis­(1H-imidazole-κN3)copper(II)]-μ-furan-2,5-di­car­boxylato-κ2O2:O5] trihydrate]

In the title cooridnation polymer, {[Cu(C6H2O5)(C3H4N2)2(H2O)]·3H2O}n, an infinite chain is formed along [001] by linking of the Cu(C3N2H4)2(H2O) entities with two bridging monodentate carboxylate groups of two different furan-2,5-dicarboxylate dianions. The geometry of the Cu2+ ion is a square-based pyramid with the water atom in the apical position and the ligand O and N atoms in a trans orientation. The dihedral angle between the imidazole planes is 83.96 (14)°. Ow–H⋯O and Ni–H⋯O (w = water and i = imidazole) hydrogen bonds help to establish the packing.

catena-Poly[[(1,10-phenanthroline-κ2N,N′)zinc]-μ-furan-2,5-dicarboxyl­ato-κ4O2,O2′:O5,O5′]

In the title coordination polymer, [Zn(C6H2O5)(C12H8N2)]n, an infinite chain is formed along [010] by linking the chelated {Zn(phen)} entities (phen is 1,10-phenanthroline) with two carboxylate groups of the furan-2,5-dicarboxylate ligand. The ZnII atom shows trigonal–prismatic coordination.

Synthesis, Structure, and Characterization of Keggin-Type Germanate

A novel Keggin-type germanate, (NH4)9[Ge7O14F3]3·1.75H2O (I), is hydrothermally synthesized and structurally characterized by X-ray single-crystal diffraction, elemental analysis, XRD, and TG. (I) is tetragonal system with space group I4/mmm and unit cell: (4) A, (5) A, (6) A3, , , , for 2576 reflections with (Fo). Ge7O14F3 entry is defined as the cluster including one octahedron, two edge-sharing triganol bipyramids, and four tetrahedra. Every Ge7O14F3 entry links adjacent four Ge7O14F3 entries by four tetrahedra. Twelve Ge7O14F3 entries construct a cage with all octahedra of Ge7O14F3 pointing inside, which can be simplified into Keggin-type cage through Ge7O14F3 as the node. The solvent experiment proves that (I) is stable in the water and sensitive to base and acid. The result of XRD shows that the structural water of (I) is easily lost to drop the crystalline. The thermal study indicates that the Keggin-type cage of (I) begins to partly collapse at 200°C and finally changes into GeO2.

catena-Poly[[(1,3-dimethyl­imidazolin-2-one-κN)(1,10-phenanthroline-κ2N,N′)copper(II)]-μ-furan-2,5-dicarboxyl­ato-κ2O2:O5]

The polymeric title compound, [Cu(C6H2O5)(C12H8N2)(C5H10N2O)]n, is composed of an infinite chain formed along [100] by linking the (1,3-dimethylimidazolin-2-one)(1,10-phenanthroline)copper(II) units with two O atoms of two carboxylate groups of the furan-2,5-dicarboxylate ligand. The CuII atom, which lies on a twofold rotation axis, displays a square-pyramidal coordination. The dihedral angles of the 1,10-phenanthroline ligand with respect to the furan rings of the carboxylate anions that are connected to the metal atom are 62.18 (11) and 88.27 (12)°.

Poly[[μ-aqua-diaqua­bis­(μ-furan-2,5-dicarboxyl­ato-κ2O2:O5)bis­(1,10-phenanthroline-κ2N,N′)dicopper(II)] N,N-dimethyl­formamide monosolvate]

The asymmetric unit of the title compound, {[Cu2(C6H2O5)2(C12H8N2)2(H2O)3]·C3H7NO}n, contains two CuII atoms, two furan-2,5-dicarboxylate (L) ligands, two 1,10-phenanthroline (phen) ligands, three coordinating water molecules and one N,N-dimethylformamide solvent molecule. Each CuII atom is coordinated by two N atoms from one phen ligand, two O atoms from two L ligands and two water molecules in a distorted octahedral geometry. The main difference between the environments of the two independent Cu atoms is in the Cu—Owater distances, which are 2.415 (2) and 2.639 (2) Å for one CuII atom and 2.3560 (19) and 2.911 (4) Å for the other. Ligands L and one independent water molecule bridge the CuII atoms, forming corrugated polymeric layers parallel to the ab plane. Intermolecular O—H⋯O and C—H⋯O hydrogen bonds consolidate the crystal packing.

catena-Poly[[[aqua­(2,2′-bipyridine-κ2N,N′)zinc]-μ-furan-2,5-dicarboxyl­ato-κ2O2:O5] dihydrate]

In the title hydrated coordination polymer, {[Zn(C6H2O5)(C10H8N2)(H2O)]·2H2O}n, an infinite [1-10] chain is formed by the linking of [Zn(C10H8N2)(H2O)]2+ entities by bridging, monodentate furan-2,5-dicarboxylate dianionic linkers. The Zn2+ coordination geometry is a trigonal bipyramid, with one N atom (from 2,2′-bipyridine) and one O atom (from the bridging dianion) in the axial positions. For each ZnII atom, the dihedral angle between the furan ring of its coordinated bridging ligand and its coordinated bipyridine ring system is 87.19 (8)°. O—H⋯O hydrogen bonds involving both the coordinated and uncoordinated water molecules generate a layer motif parallel to (001).

catena-Poly[[[aqua-(2,2'-bipyridine-κ(2)N,N')copper(II)]-μ-furan-2,5-di-carboxyl-ato-κ(2)O(2):O(5)] dihydrate].

In the crystal structure of the title compound, {[Cu(C6H2O5)(C10H8N2)(H2O)]·2H2O}n, an infinite chain parallel to [110] is formed by the linking of Cu(H2O)(2,2′-bipyridine) units through a furan-2,5-dicarboxylate bridge. The CuII atom shows a square-pyramidal geometry, with one furan-2,5-dicarboxylate O atom in the apical position. The dihedral angle between the planes of the furan ring and the bipyridine molecule is 83.88 (7)°. Owater—H⋯O hydrogen bonds connect adjacent chains, generating a layer motif parallel to (001).

catena-Poly[(aqua-dimethano-lzinc)-μ-furan-2,5-dicarboxyl-ato-κ(3)O(2):O(2),O(2')].

In the crystal structure of the title compound, [Zn(C6H2O5)(CH3OH)2(H2O)]n, an infinite chain is formed along the b axis by linking of the Zn(OH2)(CH3OH)2 unit with one carboxylate group of the furan-2,5-dicarboxylate ligand. The ZnII ion is in a distorted octahedral environment with one weak coordination [Zn—Ocarboxylate = 2.565 (3) Å] and two methanol molecules located in axial positions. In the chain, Owater—H⋯O hydrogen bonds are present, while adjacent chains are linked by Omethanol—H⋯O hydrogen bonds into a layer parallel to (10-2).