One-dimensional Double-chain Structure Research Articles

Synthesis, Crystal Structure and Theoretical Calculations of a Cadmium(II) Coordination Polymer Assembled by 4,4′-Oxydibenzoic Acid and 1,3-Bis(imidazol-1-ylmethyl)-Benzene Ligands

A new Cd(II) coordination polymer based on 4,4′-oxydibenzoic acid (H2oba) and 1,3-bis(imidazol-1-ylmethyl)benzene (mbix), namely, [Cd(oba)(mbix)]n (1), has been successfully synthesized under hydrothermal conditions. Its structure has been determined by single crystal X-ray diffraction analysis, elemental analyses, IR, TGA and fluorescence spectrum. Compound 1 shows a one-dimensional double-chain structure. The intermolecular C–H···O, C–H···N hydrogen bonding and π–π stacking interactions extend the compound 1 into 2D supramolecular architectures and play an important role in stabilizing compound 1. In addition, natural bond orbital analysis was performed by using the PBE0/LANL2DZ method built in Gaussian 09 Program. The calculation results showed the obvious covalent interaction between the coordinated atoms and Cd(II) ion. A new Cd(II) coordination polymer based on 4,4′-oxydibenzoic acid (H2oba) and 1,3-bis(imidazol-1-ylmethyl)benzene (mbix), namely, [Cd(oba)(mbix)]n (1), has been successfully synthesized under hydrothermal conditions. It shows a one-dimensional double-chain structure. The intermolecular C–H···O, C–H···N hydrogen bonding and π–π stacking interactions extend the compound 1 into 2D supramolecular architectures and play an important role in stabilizing compound 1.

Two-dimensional Zn(II) and one-dimensional Co(II) coordination polymers based on benzene-1,4-dicarboxylate and pyridine ligands.

Coordination polymers constructed from metal ions and organic ligands have attracted considerable attention owing to their diverse structural topologies and potential applications. Ligands containing carboxylate groups are among the most extensively studied because of their versatile coordination modes. Reactions of benzene-1,4-dicarboxylic acid (H2BDC) and pyridine (py) with Zn(II) or Co(II) yielded two new coordination polymers, namely, poly[(μ4-benzene-1,4-dicarboxylato-κ(4)O:O':O'':O''')(pyridine-κN)zinc(II)], [Zn(C8H4O2)(C5H5N)]n, (I), and catena-poly[aqua(μ3-benzene-1,4-dicarboxylato-κ(3)O:O':O'')bis(pyridine-κN)cobalt(II)], [Co(C8H4O2)(C5H5N)2(H2O)]n, (II). In compound (I), the Zn(II) cation is five-coordinated by four carboxylate O atoms from four BDC(2-) ligands and one pyridine N atom in a distorted square-pyramidal coordination geometry. Four carboxylate groups bridge two Zn(II) ions to form centrosymmetric paddle-wheel-like Zn2(μ2-COO)4 units, which are linked by the benzene rings of the BDC(2-) ligands to generate a two-dimensional layered structure. The two-dimensional layer is extended into a three-dimensional supramolecular structure with the help of π-π stacking interactions between the aromatic rings. Compound (II) has a one-dimensional double-chain structure based on Co2(μ2-COO)2 units. The Co(II) cations are bridged by BDC(2-) ligands and are octahedrally coordinated by three carboxylate O atoms from three BDC(2-) ligands, one water O atom and two pyridine N atoms. Interchain O-H...O hydrogen-bonding interactions link these chains to form a three-dimensional supramolecular architecture.

Slow Magnetization Relaxation in a 1-D Double-Chain Coordination Polymer Composed of {Dy<sup>III</sup> <sub>4</sub>} Repeating Units

The “unsuccessful” synthesis of the non-commercially available ‘Dy(O2CPh)3’ precursor from the stoichiometric reaction of Dy(NO3)3·5H2O with 3 equivalents of NaO2CPh in MeCN/H2O has led instead to the “successful” isolation and structural characterization of the 1-D coordination polymer [Dy4(O2CPh)12(H2O)8]n·2n(PhCO2H)·n(MeCN) (1·2n(PhCO2H)·n(MeCN)) in excellent yields (~90%). The one-dimensional double-chain structure of 1 was resulted from the linkage of two parallel chains by syn,anti-η1:η1:µ PhCO2 - groups. The lattice structure of 1 is further extended to a 2-D network through hydrogen bonding and Π-Π stacking interactions. The observation of out-of-phase (χ"M) ac susceptibility signals suggested that 1 might be a molecular nanomagnet, and this was confirmed by single-crystal magnetization vs. dc field sweeps that exhibited hysteresis, the diagnostic property of a magnet.

Self-assembly of two one-dimensional zinc polymers based on (+)-N-tosyl-l-glutamic acid

Two novel zinc (II) coordination polymers [Zn(Him)(H2O)(L)]n (1) and {[Zn(2,4′-bipy)(H2O)](L)}n (2) (H2L=(+)-N-tosyl-l-glutamic acid, Him=imidazole, and 2,4′-bipy=2,4′-bipyridine) were synthesized and then structurally characterized by elemental, infrared, thermogravimetric, and X-ray crystallography analyses. Compound 1 crystallized in the chiral space group P21 and had a ladder-like one-dimensional double-chain structure. Compound 2 crystallized in the achiral space group P21/c and had a one-dimensional single-chain framework. Both compounds assembled to form two-dimensional supramolecular structures through hydrogen-bonding interactions. The two compounds also showed intense fluorescence at room temperature.

Three organic–inorganic hybrid complexes based on the Wells–Dawson polyoxoanion

Three new organic–inorganic hybrid complexes based on the Wells–Dawson polyoxoanion, namely (H2bpp)[Ni2(bpp)2(H2O)4(P2W18O62)]·H2O 1, [Cu6(Hbpy)6(bpy)3(P2W18O62)2]·2H2O 2 and (Him)5[Cu(im)2(P2W18O62)]·4H2O 3 [bpp = 1,3-bis (4-pyridyl) propane, bpy = 4,4′-bipyridine, im = imidazole] have been synthesized and characterized. Complex 1 exhibits a three-dimensional (6, 3)-connected framework with anatase topology constructed from [α-P2W18O62]6− clusters and [Ni(bpp)]2+ fragments. Each [α-P2W18O62]6− anion links to six nickel atoms through six terminal oxygen atoms from four polar and two equatorial WO6 octahedra, which shows a novel coordination mode of a Wells–Dawson cluster with a transition-metal atom. Complex 2 displays an interesting one-dimensional double-chain structure built from [α-P2W18O62]6− clusters and [Cu2(bpy)(Hbpy)2]2+ fragments. To our knowledge, complex 2 represents the first double-chain organic–inorganic hybrid complex based on a Wells–Dawson-type cluster. Complex 3 possesses a one-dimensional zigzag chain structure constructed from [α-P2W18O62]6− anions and [Cu(im)2]+ units through weak Cu···O interactions.

Aqua[2-(2-pyridylmethyliminomethyl)phenolato]nickel(II) nitrate monohydrate

In the title compound, [Ni(C13H11N2O)(H2O)]NO3·H2O, the Ni(II) ion is coordinated by one O atom and two N atoms of the Schiff base ligand and the O atom from a water mol­ecule, forming a slightly distorted square-planar geometry. A one-dimensional double-chain structure is formed along [001] by O⋯H—O hydrogen bonds and the Ni⋯O [2.617 (3) Å] inter­actions.

Design and construction of two new polymers featuring macrocyclic subunits based on a rigid clamp-like ligand

Abstract Reaction of a rigid conjugated clamp-like ligand N,N′-bis(pyridin-3-yl)-2,6-pyridinedicarboxamide (bppdca) with ZnSO 4 ·7H 2 O or CoSO 4 ·7H 2 O resulted in the formation of two new polymers, namely, {[Zn 2 (bppdca)(SO 4 ) 2 (DMF) 2 ]·(DMF)} n ( 1 ) and {[Co(bppdca)(SO 4 )(CH 3 OH)(DMF)]·H 2 O} n ( 2 ). Both 1 and 2 feature one-dimensional double-chain structures with macrocyclic subunits, and the chains further self-assemble into a higher-dimensional framework via the hydrogen-bonding and π–π stacking interactions. Fluorescence studies show that the free ligand displays a strong fluorescence emission in solid state at room temperature, but in 1 and 2 , the complexation of the ligand with metal ions and weak intermolecular interactions make the fluorescence emission partial quenching.

Syntheses and structures of three manganese coordination polymers with 1,4- bis (imidazol-1-yl)butane

Three manganese coordination polymers [Mn(bimb)2(NCS)2] n (1), [Mn(bimb)2(dca)2] n (2) and [Mn(bimb)2(N3)2] n (3) (bimb = 1,4-bis(imidazol-1-yl)butane, dca = dicyanamide) were synthesized and characterized by X-ray crystallography, IR and thermogravimetric analysis. In 1 and 2, each Mn(II) links two Mn(II) atoms by double bimb ligands and extends to form a one-dimensional double chain structure containing the Mn2(bimb)2 22-member metallocycle. 3 constructs a two-dimensional (4,4) network linked by bimb bridges.

Catena-Poly[pentaaqua(μ3-5-carboxylato-2-oxidopyridinium-1-acetato)barium(II)

The title complex, [Ba(C8H5NO5)(H2O)5]n, possesses a one-dimensional double-chain structure in which four-membered rings and 18-membered rings are arranged alternately, with the Ba center nine-coordinated by five water molecules and three carboxylate groups from three different ligands. Inter­molecular O—H⋯O hydrogen bonds and strong π–π inter­actions between pyridine rings extend these chains into a three-dimensional architecture (distance between pairs of adjacent pyridine rings = 3.306 A; centroid–centroid separation = 3.424 A).

Solvothermal syntheses, crystal structures, and luminescent properties of two novel silver(I) coordination polymers containing 5-aryl-substituted tetrazolate ligands

The solvothermal reactions of AgNO 3, NaN 3, with benzonitrile or 4-cyanopyridine in methanol/water yield two novel metal–organic coordination polymers, [Ag(μ 3-phtta)] n ( 1) (phtta = 5-phenyltetrazolate) and {Ag[μ 4-(4-pytta)]} n ( 2) [4-pytta = 5-(4-pyridyl)tetrazolate], respectively. The two reactions were involved in the in situ formation of 5-aryl-substituted tetrazolate ligands (phtta and pytta) through [2 + 3] cycloaddition reactions of azide anion with benzonitrile or 4-cyanopyridine. Compounds 1 and 2 were characterized by elemental analysis, IR spectra, and single-crystal X-ray crystallography. Compound 1 has a one-dimensional double-chain structure in which centrosymmetric dimeric [Ag(phtta)] 2 units are interconnected by four Ag–N bonds. These double-chains are further stacked into a 2D layer network through π–π interactions between tetrazolyl rings and interactions between Ag + and phenyl group or tetrazolyl ring. Compound 2 has an intriguing 3D non-interpenetrated supramolecular structure in which a 2D layer network with (4.8 2) Ag(4.8 2) pytta topology holds the adjacent layers together via interactions of Ag + ions in one layer with 4-N atoms of pytta ligands in the other. Photoluminescence studies revealed that solids 1 and 2 exhibit strong blue fluorescent emissions at λ max = 422 and 390 nm ( λ ex = 345 nm), respectively, at ambient temperature.

Syntheses, structures, and magnetic properties of dicyanamide bridged one-dimensional double chain and discrete dinuclear complexes of manganese(II) derived from 6,7-dimethyl-2,3-di(2-pyridyl)quinoxaline or 2,4,6-tri(2-pyridyl)-1,3,5-triazine

Syntheses, structures, and magnetic properties of two dicyanamide (dca) bridged compounds of manganese(II), [Mn II(DMeDPQ)(μ 1,5-dca) 2] n ( 1) and [ Mn 2 II ( TPT ) 2 ( μ 1 , 5 -dca ) 2 ( H 2 O ) 2 ] ( ClO 4 ) 2 ( 2 ) , have been described (DMeDPQ = 6,7-dimethyl-2,3-di(2-pyridyl)quinoxaline; TPT = 2,4,6-tri(2-pyridyl)-1,3,5-triazine). While 2 is a discrete dinuclear compound, the structure of 1 is polymeric and consists of one-dimensional double chains. DMeDPQ and TPT behave here as bidentate and tridentate chelating ligands, respectively. The one-dimensional double chain structure in 1 is formed due to the dual existence of two single and two double end to end (μ 1,5-, EE) dca ligands. In the case of 2, the metal centers are bridged by two double EE dca ligands. The variable-temperature magnetic susceptibility measurements of both compounds reveal that dicyanamide mediates a weak antiferromagnetic interaction between the metal centers.

Poly[[bis(1H-imidazole-κN3)cadmium(II)]-μ3-benzene-1,3-dioxyacetato

Each seven-coordinate CdII atom in the title coordination polymer, poly­[[bis(1H-imidazole-κN3)­cadmium(II)]-μ3-m-phenyl­enebis­(oxy­acetato)], [Cd(1,3-BDOA)(C3H4N2)2]n (1,3-BDOA2− is the benzene-1,3-dioxy­acetate dianion, C10H8O6), displays a distorted monocapped octahedral coordination geometry, defined by two N atoms from the imidazole ligands and five O atoms from three 1,3-BDOA2− anions. Adjacent CdII atoms are bridged by two 1,3-BDOA2− ligands, forming a one-dimensional double-chain structure, with Cd⋯Cd separations of 4.014 (3) A across the double chain and 13.105 (2) A along the chain. A network of N—H⋯O interchain hydrogen bonds is also present.

Synthesis and crystal structure of trichromium metal string complex

The synthesis, crystal structures and molecular packing of the three trichromium metal string complexes [Cr 3(dpa) 4Cl(OC 2H 5)]OH·C 2H 5OC 2H 5·2.5H 2O ( 1), [Cr 3(dpa) 4(OH) 2]ClO 4·3H 2O ( 2) and [Cr 3(dpa) 4F 2Na(H 2O)BF 4]BF 4·CH 3OH ( 3) (dpa −=bis(2-pyridyl)amido) have been studied. The crystal structure data for 1: C 46H 54ClCr 3N 12O 5.5, monoclinic, P2 1 / c, a=19.9998(4) Å, b=15.9756(3) Å, c=16.9943(3) Å, β=114.0548(8)°, Z=4, R 1=0.0791, wR 2=0.1927; for 2: C 40H 40ClCr 3N 12O 9, orthogonal, Pna2 1 , a=18.3373(2) Å, b=16.8220(2) Å, c=14.0268(2) Å, Z=4, R 1=0.0683, wR 2=0.1804; for 3: C 41H 38B 2Cr 3F 10N 12NaO 2, monoclinic, P2 1/n , a=12.3902(1) Å, b=16.2081(2) Å, c=23.4119(3) Å, β=98.8725(6)°, Z=4, R 1=0.0670, wR 2=0.1568. The structure data were collected using graphite monochromated molybdenum Kα radiation and refined using full-matrix least square techniques on F 2. The magnetic property of complex 1 was carried out on polycrystalline samples with a SQUID magnetometer. The IR, FAB-MS mass spectra of all complexes were also measured. In the three complexes, trichromium metal string complexes can be considered as mini-1D asymmetrically chains since the distance between the two axial ligands is around 1 nm. The types of hydrogen bonding in three complexes are C–H⋯O, C–H⋯Cl, C–H⋯F and O–H⋯O). 1 and 2 have a one-dimensional double-chain structures. 1 is a rare example of three-dimensional novel sandwich structure. In 3, one of the axial ligand, F − acts as a bridge ligand to link the sodium ion to the Cr 3 axis with a bond angle of Cr(1)–F(1)–Na in 169.90(13)°. It can be considered as a metal string complex with an extra long axis.

Bis(4,4'-bipyridine-kappaN)bis(hydrogen phthalato)-kappa2O,O';kappaO-zinc(II).

The title compound, [Zn(C8H5O4)2(C10H8N2)2], was obtained by the hydrothermal reaction of ZnSO4.7H2O with phthalic acid (H2pht) and 4,4'-bipyridine (4,4'-bipy). Crystallographic analysis shows that it has a one-dimensional double-chain structure via hydrogen-bonding interactions. Each Zn(II) atom, adopting a distorted tetrahedral geometry, is coordinated by two N atoms from two 4,4'-bipy ligands, with Zn-N distances of 2.054 (4) and 2.104 (4) A, and by two O atoms from symmetry-related Hpht- ligands, with Zn-O distances of 1.921 (4) and 2.019 (4) A.

A one-dimensional double-chain coordination polymer: [Mn(C12H13NO6S)(C10H8N2)]n.

In the title compound, poly[[(2,2'-bipyridine-kappa(2)N,N')manganese(II)]-micro(3)-N-tosyl-L-glutamato-kappa(4)O,O':O":O"'], [Mn(tsgluo)(bipy)](n), where tsgluo is N-tosyl-L-glutamate (C(12)H(13)NO(6)S) and bipy is 2,2'-bipyridine (C(10)H(8)N(2)), the Mn atoms are octahedrally coordinated by two N atoms of one bipy ligand and by four O atoms of three tsgluo(2-) anions. The gamma-carboxyl group coordinates to the Mn(II) atom in a chelating mode, while the alpha-carboxyl group coordinates in a bidentate-bridging mode. The complex displays a one-dimensional double-chain structure.

A novel one-dimensional framework material constructed from antimony-substituted polyoxovanadium clusters: [(C 2N 2H 10) 2β-{Sb III8V IV14O 42(H 2O)}](C 2N 2H 8) · 4H 2O

The novel polyoxovanadate containing antimony [(C 2N 2H 10) 2β-{Sb III8V IV 14O 42(H 2O)}](C 2N 2H 8) · 4H 2O has been synthesized from a mixture of VOSO 4, Sb 2O 3, en and H 2O under hydrothermal conditions. The spherical [β-{Sb III8V IV 14O 42(H 2O)}] 4− clusters form a one-dimensional double-chain structure with non-bonding Sb ⋯ O contacts.