Syntheses and crystal structures of two Cd(II) coordination polymers: one-dimensional chain [Cd(C4H6N2)2(C4H2O4)(H2O)2] n and two-dimensional sheet [Cd(C4H6N2)(H2O)(C4H4O4)] n · n H2O

Two new Cd(II) coordination polymers, [Cd(C₄H₆N₂)₂(C₄H₂O₄)(H₂O)₂] _n (1) (where C₄H₆N₂?=?2-methylimidazole, C₄H₂O₄?=?fumarate), and [Cd(C₄H₆N₂)(H₂O)(C₄H₄O₄)] _n ?·?nH₂O (2), (where C₄H₄O₄?=?succinates), have been prepared and structurally characterized by single crystal X-ray diffraction. Complex 1 crystallizes in the triclinic space group P 1 in a one-dimensional chain structure, in which carboxy is monodentate; a three-dimensional supermolecular network structure was formed through hydrogen bonding. In complex 2, the coordination geometry of the Cd atoms is a pentagonal bipyramid, and a two-dimensional sheet is formed though carboxyl group bridging. In 1 and 2, IR spectra indicate the presence of bridging carboxyl groups, confirmed by structure analyses.     

Synthesis, crystal structure, and fluorescence properties of a novel coordination polymer [Zn(L)(4,4′-bipyridine)(H2O)] n · (H2O)4

In this work, a novel and rare coordination polymer, [Zn(L)(Bipy)(H₂O)] _n · (H₂O)₄ (H₂L??sphenylpropylmalonate acid, Bipy??4,4??-bipyridine), has been synthesized and characterized by elemental analysis, FT-IR spectroscopy, and solid fluorimetry studies. In the crystal, the Zn²⁺ ion of the complex is hexacoordinated in a slightly distorted octahedral configuration forming the unit structure, 2D structure, and 3D framework. The supramolecular architecture was constructed by a unit of (H₂O)₄ discrete water cluster. Besides, the coordination polymer displays strong emission spectra due to the metal-to-ligand charge-transfer transition, having potential applications as fluorescent materials.     

Synthesis, crystal structure, and interaction with DNA of a novel coordination polymer: {[Cd(Pmal)(Bipy)] · 4H2O} n

A novel coordination polymer {[Cd(Pmal)(Bipy)] · 4H₂O} _n (I), where Bipy = 2,2??-Bipyridine, Pmal = phenethylmalonate, has been synthesized and characterized using IR, ¹H NMR, elemental analysis, and single-crystal X-ray diffractometry. The unit cell parameters for complex I: a = 12.3752(15), b = 6.8283(9), c = 13.4739(17) ?, ?? = 91.108(2)°, V = 1138.4(2) ?³, Z = 2, space group P2₁. The binding of complex I with fish sperm DNA (FS-DNA) was investigated by fluorescence spectroscopy, showing that the complex has the ability of interaction with DNA. Gel-electrophoresis assay demonstrates the ability of complex I to cleave the pBR322 plasmid DNA.     

Synthesis and crystal structure of [Ag2(μ4-hmt)(NO2)2]n. A two-dimensional network with square cavities self-assembled by hmt (hmt = Hexamethylenetetramine)

AgNO₂ (1 mol) reacts with hexamethylenetetramine (hmt) (1 mol) in MeCN–H₂O to yield a two-dimensional coordination polymer [Ag₂( ₄-hmt)(NO₂)₂]_n with square cavities. The Ag2 atom is located in a linear structure coordination environment with two nitrogen atoms from two hmt molecules respectively. The Ag1 atom is coordinated in a triangular prism surrounded by two nitrogen atoms from two hmt molecules respectively and four oxygen atoms from two NO^– ₂ ions respectively. The four nitrogen atoms of each hmt unit are all connected to Ag^I to form a two-dimensional network.     

Synthesis,crystal structure and magnetic properties of a 1D coordination polymer[Ni(phth)(phen)(H2O)] n · n H2O

A new one-dimensional coordination polymer [Ni(phth)(phen)(H₂O)] _n ?·?nH₂O was synthesized. The structure was determined by X-ray crystallography revealing that each nickel atom is five-coordinate bridged via phthalate ion to form a zigzag chain. The chains are further linked together via hydrogen-bonding interactions to construct a three dimensional supramolecular network. The magnetic properties of the complex show that there are weak antiferromagnetic interactions between Ni(II) centers.     

(NH4)(CN3H6)2[UO2(C2O4)2(NCS)] · 2H2O: Synthesis and crystal structure

A single-crystal X-ray diffraction study (NH₄)(CN₃H₆)₂[(UO₂(C₂O₄)₂(NCS)] · 2H₂O (I) was carried out. The crystals are orthorhombic, space group P2₁2₁2₁, Z = 4, with the unit cell parameters a = 6.668(2) Å, b = 13.463(4) Å, c = 23.086(6) Å. The main structural units of the crystals of I are insular complex anions [(UO₂)(C₂O₄)₂(NCS)]^3?. They belong to the crystal-chemical group AB ₂ ⁰¹ M¹ (A = UO ₂ ²⁺ ) of uranyl complexes and are linked into a three-dimensional framework through electrostatic interactions and hydrogen bonds with the participation of ammonium and guanidinium cations and crystal water molecules.     

Synthesis and crystal structure of a novel tartrate copper(II) two-dimensional coordination polymer: {[Cu2(C4H4O6)2(H2O)2]·4H2O}∞

A new 2D coordination polymer, {[Cu₂(C₄H₄O₆)₂(H₂O)₂]·4H₂O}_∞ has been synthesized by the hydrothermal method and characterized by X-ray single crystal diffraction. Every copper(II) atom adopts a distorted octahedral geometry and coordinates with six oxygen atoms from one water molecule and three tartrate acid ions. The two tartrate acid ions have different coordination modes, one provides four oxygen atoms to coordinate with Cu(II) and another coordinates with all six oxygen atoms. Such a coordination mode generates a two-dimensional coordination polymer. In the solid state, the title compound forms a 3D network structure through hydrogen bonds.     

Synthesis and crystal structure of a three-dimensional 3d-4f heterometallic coordination polymer {[Sm2Ni(Pdc)2(SO4)2(H2O)6] · H2O} n

A new 3d-4f coordination polymer {[Sm₂Ni(Pdc)₂(SO₄)₂(H₂O)₆] · H₂O} _n (H₂Pdc = pyridine-3,5-dicarboxylic acid) has been synthesized under hydrothermal conditions and structurally determined by X-ray diffraction method. The X-ray diffraction analysis reveals the compound crystallizes in the triclinic system, space group $P\bar 1$ , with a = 10.062(4), b = 10.249(4), c = 12.744(5) Å, α = 93.548(4)°, β = 102.601(4)°, γ = 94.022(3)°, V = 1275.4(8) ų, F(000) = 972, M _r = 1077.85, Z = 2, ρ _c = 2.624 g cm^?3, μ = 5.55 mm^?1, final R = 0.0299, wR = 0.0805 for 4716 independent reflections with R _int = 0.0204. According to the structure determination the complex is a three-dimensional (3D) network structure in which infinite lanthanide-carboxylate chains are linked by [Ni(SO₄)₂]^2? metalloligands to form a mixed-metal coordination network.     

Synthesis,Crystal Structure and Magnetic Property of [Mn2(mal)2(H2O)2(µ2-hmt)] n : A Novel Three-Dimensional Network Self-Assembled by hmt (hmt = Hexamethylenetetramine and mal = Malonate)

A novel three-dimensional coordination polymer [Mn₂(mal)₂(H₂O)₂(μ₂-hmt)] _n (hmt = hexamethylenetetramine, and mal = malonate) was synthesized and characterized by elemental analysis, crystal structure, IR, TG-DTA and magnetic susceptibility. The compound [Mn₂(mal)₂(H₂O)₂(μ₂-hmt)] _n crystallizes in the orthorhombic system, space group 12 mm, with a = 7.1059(11), b = 7.6986(6), c = 15.9824(13) Å, and Z = 2. Mn(II) ion has octahedral geometry coordinated by four oxygen atoms from three malonate, one oxygen atom of water and one nitrogen atom of hmt ligand. The two oxygen atoms of each malonate coordinate to the same Mn(II) ion and the other two oxygen atoms connect to two adjacent Mn(II) ions to form an infinite layer. These layers are bridged by the μ₂-hmt ligands to form a three-dimensional structure. The magnetic susceptibility data show that there is an antiferromagnetic exchange interaction in the title compound.     

Coordination polymer of lanthanum: synthesis,properties and crystal structure of [La(4,4′-bipyridine)(CCl2HCOO)3(H2O)] n

A new mixed ligand complex of general formula [La(H₂O)(4,4′-bpy)(CCl₂HCOO)₃] _n has been synthesized and characterized by elemental and thermal analysis, IR spectroscopy and conductivity studies. The crystal and molecular structure was determined. The lanthanum atom is ten coordinate by four oxygen atoms from two chelating tridentate dichloroacetate substituents, two oxygen atoms from two bidentate bridging dichloroacetate groups, two oxygen atoms from two bridging tridentate dichloroacetate substituent, one oxygen atom of water molecule and one nitrogen atom from 4,4′-bipyridyl substituent. The coordination polyhedron of central atom can be described as tetradecahedron. The molecules are built up by O–H?···?N hydrogen bonds to a two-dimensional network.     

Synthesis and crystal structure of the porous metal-organic coordination polymer [Zn4(Ndc)4(Oxdz)2] · 2H2O

New metal-organic coordination polymer [Zn₄(Ndc)₄(Oxdz)₂] · 2H₂O (H2Ndc = 2,6-naphthalenedicarboxylic acid, Oxdz = 1,3,4-oxadiazole) was prepared by heating a solution of zinc nitrate, naphthalenedicarboxylic acid, and 4-aminotriazole in DMF. Of particular interest is the in situ transformation of 4-aminotriazole into 1,3,4-oxadiazole. The structure and the composition of the obtained compounds were established by X-ray diffraction, IR spectroscopy, and elemental analysis. The metal-organic framework is electrically neutral and forms a channel structure with the pore diameter of 9 Å.     

Synthesis and structure of a three-dimensional lanthanide complex [Tm2(C5H3N(COO)2)3(H2O)3)]·H2O

A new three-dimensional complex [Tm₂(C₅H₃N(COO)₂)₃(H₂O)₃)]·H₂O (PDC?=?3,5-pyridinedicarboxylate), has been synthesized and its structure determined by x-ray single crystal diffraction methods. Complex 1 crystallizes in the monoclinic space group P2(1)/n with a?=?14.579(4), b?=?11.193(3), c?=?14.839(5)?Å, β?=?94.009(6)°, U?=?2415.5(13)?ų. Two independent PDC ligands bridge Tm^III ions from different orientations to form a network. Thermogravimetric analyses on compound 1 show its high structural stability to 410°C.     

Crystal structure of the coordination polymer [Cu2(S-mal)2(bpy)2(H2O)]·2.5H2O

Journal of Structural Chemistry - In the interaction of basic copper carbonate with optically pure malic acid and 4,4′-bipyridine [Cu2(S-mal)2(bpy)2(H2O)]·2.5H2O (1) is obtained. The...     

A 3-D pillar-layered coordination polymer {[EuCu(C2O4)(na)2] · 2H2O} n : synthesis,structure and photoluminescent properties

A 3d–4f heterometallic coordination polymer, {[EuCu(C₂O₄)(na)₂] ·?2H₂O} _n (1) [Hna=nicotinic acid], has been synthesized by hydrothermal reaction of lanthanide oxides, Cu(I), and pyridine-2,3-dicarboxylic acid. 1 features a 3-D pillar-layered coordination framework constructed from two-dimensional lanthanide-carboxylate layers and Cu(na) pillars. Interestingly, the na ligand was obtained by the in situ decarboxylation of pyridine-2,3-dicarboxylic acid.     

Two cadmium(II) 1-D coordination polymers, {[Cd2(μ-Cl)4Cl2(CH3OH)(H2O)] · (H-aql)2} n and [Cd(μ-Cl)2(aql)] n : synthesis,crystal structures and fluorescent properties

Two Cd(II) 1-D chain coordination polymers with Cd–Cl-Cd–Cl 1-D chains as bases, one connected to protonated 8-aminoquinoline by intermolecular hydrogen bonds {[Cd₂(μ-Cl)₄(Cl)₂(CH₃OH)(H₂O)]·(H-aql)₂} _n (1) (aql = 8-aminoquinoline) and the other to 8-aminoquinoline [Cd(μ-Cl)₂(aql)] _n (2), have been synthesized and structurally characterized by single-crystal X-ray analysis. 1 belongs to the monoclinic system with space group P2(1)/m and 2 belongs to the monoclinic system with space group C2/c. Fluorescent properties of aql, 1, and 2 showed that the fluorescence spectrum (λ_max = 386 nm) of 1 is mainly of aql ππ* character. The fluorescence spectrum of 2 which emits blue-green light (λ_max = 497 nm) mainly involves a metal-perturbed intraligand ππ* transition from strong covalent bonds. Thermal stabilities of 1 and 2 have also been studied.     

A novel interpenetrating 2-D brush-like structure: hydrothermal synthesis and crystal structure of [Cu(phen)V4O10]∞ (phen=1,10-phenanthroline)

A novel vanadium oxide, [Cu(phen)V₄O₁₀]_∞ (1), has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, EPR spectroscopy and thermal analysis. The compound crystallizes in monoclinic structure of P2₁/m with a=7.4169(10) Å, b=10.0460(13) Å, c=11.0845(15) Å, β=102.520(2)°, V=806.27(19) Å³ and Z=2.     

Synthesis and crystal structure of [Nd(C6NO2H5)3(H2O)2] n n[ZnCl4]·nCl·2.5nH2O with novel poly-cationic chain

The title complex, [Nd(C₆NO₂H₅)₃(H₂O)₂] _n n[ZnCl₄]·nCl·2.5nH₂O (1), was obtained by hydrothermal reactions and structurally characterized by X-ray diffraction. The crystal structure analysis reveals that the title complex is characteristic of a novel polycationic [Nd(C₆NO₂H₅)₃(H₂O)₂] _n ³ⁿ⁺ one-dimensional chain-like structure.     

Syntheses and structures of seven-coordinate K3[Cd(Dtpa)], K2[Cd(H2O)4][Cd(Edta)(H2O)]2 · 2H2O, and Na2[Cd(H2O)4][Cd(Edta)(H2O)]2 · 2H2O complexes

The title complexes, K₃[Cd(Dtpa)] (H₅Dtpa = diethylenetriamine-N,N,N,N′,N′-pentaacetic acid, (I)), K₂[Cd(H₂O)₄][Cd(Edta)(H₂O)]₂ · 2H₂O (H₄Edta = ethylenediamine-N,N,N′,N′-tetraacetic acid, (II)), and Na₂[Cd(H₂O)₄][Cd(Edta)(H₂O)]₂ · 2H₂O (III), were prepared, and their compositions and structures were determined by elemental analyses, IR spectra, and single-crystal X-ray diffraction techniques, respectively. In complex I, the Cd is seven-coordinated by one Dtpa ligand yielding a pseudo-monocapped trigonal prism conformation, and the complex crystallizes in the triclinic crystal system with the Pi space group. The crystal data are as follows: a = 8.7300(17), b = 9.1200(18), c = 15.110(3) Å, α = 95.52(3)°, β = 96.59(3)°, γ = 99.63(3)°, V = 1170.0(4) ų, Z = 2, ρ = 1.754 g/cm³, μ = 1.519 mm^?1, F(000) = 616, R = 0.0644 and wR = 0.1712 for 3842 observed reflections with I ≥ 2σ(I). For complex II, in the [Cd(Edta)(H₂O)]^2? complex anion the Cd²⁺ ion is seven-coordinated by one Edta ligand and one water molecule, yielding a pseudo-pentagonal bipyramid conformation. In the [Cd(H₂O)₄]²⁺ cation, the bridged Cd is six-coordinated, yielding an almost standard octahedral conformation. The complex crystallizes in the monoclinic system with P2₁/n space group. The crystal data are as follows: a = 9.098(3), b = 16.442(6), c = 12.023(4) Å, β = 91.053(6)°, V = 1798.3(12) ų, Z = 2, ρ = 2.098 g/cm³, μ = 2.086 mm^?1, F(000) =1124, R = 0.0406 and wR = 0.1152 for 3680 observed reflections with I ≥ 2σ(I). In complex III, the conformations of Cd²⁺ ions are similar to those of the potassium salt complex, and the complex also crystallizes in the monoclinic crystal system with the P2₁/n space group. The crystal data are as follows: a = 9.134(7), b = 16.500(13), c = 12.075(10) Å, β = 91.054(12)°, V = 1820(2) ų, Z = 2, ρ = 2.015 g/cm³, μ = 1.856 mm^?1, F(000) = 1092, R = 0.0363 and wR = 0.0879 for 3707 observed reflections with I ≥ 2σ(I).     

Synthesis and crystal structure of Cs2[(UO2)2(C2O4)3] and Cs2[UO2(C3H2O4)2] · H2O

Cs₂[(UO₂)₂(C₂O₄)₃] (I) and Cs₂[UO₂(C₃H₂O₄)₂] · H₂O (II) have been synthesized and studied by X-ray diffraction. The crystals of complexes I and II are monoclinic: a = 8.1453(2) Å, b = 8.9831(2) Å, c = 11.3897(4) Å, β = 104.0950(10)°, V = 808.29(4) ų, space group P2₁/n, Z = 2, and R ₁ = 0.0255 for I and a = 9.6998(2) Å, b = 17.8686(3) Å, c = 8.2074(2) Å, β = 97.5780(10)°, V = 1410.10(5) ų, space group P2₁/c, Z = 4, and R ₁ = 0.0287 for II. The uranium-containing structural units of complexes I and II are [(UO₂)₂(C₂O₄)₃]^2? chains and [UO₂(C₃H₂O₄)₂] ₂ ^4? dimers, which belong to the AK _0.5 ⁰² T¹¹ and AT¹¹B⁰¹ crystallochemical groups (A = UO ₂ ²⁺ , K⁰² and T¹¹ = C₂O ₄ ^2? , T¹¹ and B⁰¹ = C₃H₂O ₄ ^2? ) of uranyl complexes.