Wave-like Network Research Articles

Utilizing a water-stable terbium (III) metal-organic framework for luminescent sensing of nitroimidazole antibiotics

A new 3D terbium (III)-based metal–organic framework, [Tb(TDC)(µ2-CH3COO)(H2O)] (Tb-MOF, H2TDC = 2,5-thiophenedicar-boxylic acid), was obtained with Tb3+ ions as metal source and TDC ligands as the auxiliary ligand through self-assemble mode. The Tb-MOF features a 3D network constructed by bridging a 2D wave-like network connected by TDC ligands with monodentate coordination mode, which results in the formation of a 3D net framework. The luminescent properties and sensing antibiotics experiments were extensively investigated for the Tb-MOF. Remarkably, the Tb-MOF exhibits a substantial quantum yield (QY) at 55.0 % and an average photoluminescence lifetime of 534 µs. Furthermore, the Tb-MOF shows selective luminescence quenching for nitroimidazole antibiotics, including metronidazole (MDZ), dimetridazole (DTZ), and ornidazole (ODZ), with a particularly strong response for MDZ (Ksv = 5.49 × 104 M−1, LOD value is 7.9 × 10−5 M). Finally, the Tb-MOF enables a simple and convenient test paper that allows luminescent color changes to be observed with the naked eye for detecting MDZ.

Two unusual metal-organic frameworks based on W/S/Cu clusters and Tetrakis(4-pyridyl)benzene: Enhanced nonlinear optics and efficient luminescence sensing

Tetradentate organic ligand 1,2,4,5-tetrakis (4-pyridyl)benzene (tpb) is firstly developed to build cluster-containing metal-organic frameworks (C-MOFs). Two unusual W/S/Cu C-MOFs {[WS4Cu4I2(TPB)]·DMF}n (1) and {[WS4Cu3Cl(TPB)]·2DMF}n (2) have been synthesized and structurally characterized. 1 is fabricated by 8-connected pentanuclear planar open-shaped cluster [WS4Cu4]2+, 4-connected tetrakis-pyridine TPB unit and I− bridge to form a three-dimensional (3-D) pillar-layered framework. Its (4,8)-connected topology firstly appears in W(Mo)/S/Cu C-MOFs. 2 is constructed by 4-connected T-shaped cluster [WS4Cu3]+, 4-connected TPB unit and terminal Cl− ligand, and possesses a 2-D wave-like (4,4) network. Z-scan experiment reveals that 1–2 have third-order nonlinear optical (NLO) properties. Particularly, 1 exhibits significantly enhanced NLO performance. Moreover, 2 displays strong luminescence, highly sensitive and selective sensing of 2,4,6-trinitrophenol (TNP) in aqueous medium. The efficient emission quenching mechanism of 2 towards TNP is studied as well.

Various Cd(ii) coordination polymers induced by carboxylates: multi-functional detection of Fe3+, anions, aspartic acids and bovine serum albumin.

By adjusting carboxylates, six Cd(ii) coordination polymers based on a naphthalene-methylene mixed-bridged-amide ligand, [Cd(L)(DNBA)2] (1), [Cd2(L)2(BDC)2(H2O)2]·2H2O (2), [Cd(L)(1,4-CHDA)] (3), [Cd(L)(HIPA)(H2O)]·H2O (4), [Cd(L)(MIP)]·H2O (5), and [Cd(L)(PMA)0.5(H2O)]·H2O (6) [L = N,N'-bis(4-methylenepyridin-4-yl)-1,4-naphthalene dicarboxamide, HDNBA = 3,5-dinitrobenzoic acid, H2BDC = 1,4-benzenedicarboxylic acid, 1,4-H2CHDA = 1,4-cyclohexanedicarboxylic acid, H2HIPA = 5-hydroxyisophthalic acid, H2MIP = 5-methylisophthalic acid and H4PMA = pyromellitic acid] have been synthesized under hydrothermal conditions. 1 shows a 4-c sql coplanar structure. 2 exhibits a 2-fold vertical interpenetrating structure based on wave-like 4-c sql layers. 3 shows a (3,5)-c pnh network containing a unique μ3-L. 4 features a 4-c sql wave-like network. 5 and 6 exhibit 3D structures with 6-c pcu and 4-c mog topologies. The number of carboxyl groups and functional group positions of the carboxylates have an important influence on the structures of the title complexes. The fluorescent responses of 1-6 towards Fe3+, anions, aspartic acid and bovine serum albumin were investigated. Among them, 4 shows sensitivity and selectivity (KSV = 1.16 × 104 L mol-1 for Fe3+, 1.03 × 104 L mol-1 for CrO42-, 1.08 × 104 L mol-1 for Cr2O72-, 1.17 × 104 L mol-1 for MnO4- and 1.05 × 104 L mol-1 for aspartic acid).

Assembly, Structure, and Properties of Six Coordination Polymers Based on 1,3,5-Tri-4-pyridyl-1,2-ethenylbenzene

Six coordination polymers including [Cd(tpeb)X2]n (1: X=Br, 2: X=I), [Cu(tpeb)I]n (3), [Cd2I2(tpeb)2(1,4-bdc)]n (4), {[Co(tpeb)(dpa)]·MeCN}n (5), and {[Ni2(tpeb)3(oba)2]·solvent}n (6) were prepared from solvothermal reactions of 1,3,5-tri-4-pyridyl-1,2-ethenylbenzene (tpeb) with CdII, CuI, CoII, or NiII salts in the absence or presence of 1,4-benzenedicarboxylic acid (1,4-H2bdc), 2,2′-biphenyldicarboxylic acid (H2dpa), and 4,4′-oxybisbenzoic acid (H2oba). Compounds 1–3 have 1D chain structures while 4 holds a 2D wave-like network. Compound 5 adopts a 3D (3,5)-connected net with a Schläfli symbol of 33.48.513.63.7 and 6 possesses a 3D 5-connected net with a Schläfli symbol of 42.65.7.82. Compound 2 as a representative photocatalyst shows efficient degradation of rhodamine B in water while 5 displays highly selective sensing of p-nitrophenol in water through fluorescence quenching.

2D double-layered dibenzoyl-tartrate chiral coordination polymer containing [Mn4L2(bpp)4] tetrahedral cage

The solution reactions of metal salts with (+)-dibenzoyl-tartaric acid (H2L) and 1,3-bis(4-pyridyl)propane (bpp) or 4,4′-bipyridine (4,4′-bipy) afford three two-dimensional (2D) coordination polymers, [Mn2L2(bpp)2(H2O)4]n·nH2O (1), [CuL(bpp)]n·nH2O (2) and [CoL(4,4′-bipy)(CH3OH)(H2O)]n (3). Dibenzoyl-tartrate ligand displays cis- or trans-conformation, and acts as a 1,4-dicarboxylate linker. Complex 1 features a beautiful 2D double-layered (4,4) network containing [Mn4L2(bpp)4] tetrahedral cage. The flexible bpp ligand links Mn(II) to form an interesting 64-membered saddle-shaped macrocycle [Mn4(bpp)4]. Complex 2 displays a 2D wave-like network assembled by 1D [CuL]n linear chain and 1D [Cu(bpp)]n zigzag chain. Complex 3 is a 2D layered network constructing from [CoL(CH3OH)(H2O)]n chain and [Co(4,4′-bipy)]n chain.

Spacers-directed structural diversity of Co(II)/Zn(II) complexes based on S-/O-bridged dipyridylamides: electrochemical, fluorescent recognition behavior and photocatalytic properties

To investigate the effect of the spacers of S-/O-bridged dipyridylamides on the structures of Co(II)/Zn(II) complexes, [Co(L1)(chda)]·1.5H2O (CP1), [Co(L2)(chda)] (CP2), [Zn(L1)(hip)]·DMA·2H2O (CP3), and [Zn(L2)(hip)]·2.8H2O (CP4) [L1 = N,N′-bis(pyridine-3-yl)thiophene-2,5-dicarboxamide, H2chda = trans-1,4-cyclohexanedicarboxylic acid, L2 = N,N′-bis(pyridine-3-yl)-4,4′-oxybis(benzoic) dicarboxamide, H2hip = 5-hydroxyisophthalic acid, DMA = N,N-dimethylacetamide], have been solvothermally synthesized. X-ray single-crystal diffraction shows that CP1 is a 2-D 3,5-connected network based on Co-L1 linear chains and (Co-chda)2 double chains. CP2 features a 1-D structure derived from 1-D wave-like (Co-chda)2 double chains decorated by terminal L2 ligands. CP3 and CP4 show wave-like (4,4) networks constructed by 1-D Zn-L1 zigzag and Zn-hip zigzag (for CP3)/linear (for CP4) chains. The effect of the spacers of S-/O-bridged dipyridylamides on the structures of the title complexes was discussed. Electrochemical behaviors of CP1–CP2 and solid-state luminescent properties of CP3–CP4 were studied. The luminescence investigations show that CP3 and CP4 are recycled fluorescent probes for environmentally relevant Fe3+ ions. The photocatalytic properties for the degradation of methylene blue (MB) under ultraviolet light irradiation of CP3–CP4 and the recyclable materials after fluorescent sensing Fe3+ ions (named CP3@Fe3+ and CP4@Fe3+) have also been investigated.

A two-dimensional copper(II) coordination polymer based on 2,4'-oxybis(benzoate) and 4,4'-bipyridine.

The reaction of Cu(NO3)2·3H2O with 2,4'-oxybis(benzoic acid) and 4,4'-bipyridine under hydrothermal conditions produced a new mixed-ligand two-dimensional copper(II) coordination polymer, namely poly[[(μ-4,4'-bipyridine-κ2N,N')[μ-2,4'-oxybis(benzoato)-κ4O2,O2':O4,O4']copper(II)] monohydrate], {[Cu(C14H8O5)(C10H8N2)]·H2O}n, which was characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis and single-crystal X-ray diffraction. The X-ray diffraction crystal structure analysis reveals that the CuII ions are connected to form a two-dimensional wave-like network through 4,4'-bipyridine and 2,4'-oxybis(benzoate) ligands. The two-dimensional layers are expanded into a three-dimensional supramolecular structure through intermolecular O-H...O and C-H...O hydrogen bonds. Furthermore, magnetic susceptibility measurements indicate that the complex shows weak antiferromagnetic interactions between adjacent CuII ions.

Syntheses and magnetic properties of new compounds Ca3M3(PO4)4 (M = Ni, Co) with a wave-like layer structure built by zigzag M-chains

Two isostructural compounds Ca3M3(PO4)4 (M = Co, Ni) were synthesized by conventional high-temperature solid-state reaction. The structure of the titled compounds crystallizes in the monoclinic system with space group C2/c. The magnetic M2+ ions exhibit three different oxygen-coordinated environments such as tetrahedron, pyramid, and octahedron. The unique linkages of magnetic polyhedra lead to an interesting wave-like network in the a-b plane, showing the V-like clusters inserted alternatively between the zigzag chains. Magnetic measurements suggest that isostructural compounds Ca3M3(PO4)4 exhibit different magnetic properties, in which Ca3Ni3(PO4)4 possesses an antiferromagnetic ordering at 17 K while Ca3Co3(PO4)4 shows paramagnetic behavior down to 2 K.

Syntheses, structures and luminescence of three copper(I) cyanide coordination polymers incorporating flexible N-donor ligands

Three copper(I) cyanide coordination polymers, namely [Cu8(CN)8(btmb)2]n (1), [Cu(CN)(btmb)0.5]n (2) and [Cu2(CN)2(dpa)]n (3) (btmb=1,4-bis(1,2,4-triazol-1-ylmethyl)benzene, dpa=di(4-pyridyl)amine), were synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectra, PXRD and thermogravimetric analyses. Single-crystal X-ray diffraction analyses reveal that complex 1 is an interesting 2D double-layered network constructing from eight distinct Cu(I) centers, eight μ2-cyanides and two tetradentate cis-btmb ligands. Complex 2 is a ladder-like coordination polymer assembled by CuCN linear chain and bidentate trans-btmb linker. Complex 3 has a 2D wave-like network constructing from CuCN zigzag chain and V-shape dpa spacer. These coordination polymers are thermally stable up to 270–300°C. They emit blue luminescence originating from ligand-centered emission.

Different Anderson-Type Polyoxometalate-Directed Metal–Organic Complexes Based on 2-Pyrazine Carboxylic Acid: Assembly, Structures and Properties

Two different Anderson-type polyoxometalates-directed metal–organic complexes with different structures: {H2[K(H2O)5]2[Cu(pzca)(H2O)3]2(TeMo6O24)} (1) and {H[Cu(pzca)(H2O)2]2[AlMo6(OH)6O18]}·17H2O (2) (Hpzca = 2-pyrazine carboxylic acid) have been synthesized and structurally characterized by single crystal X-ray diffraction analyses, thermogravimetric analyses, IR spectra and powder X-ray diffraction analyses. Compound 1 is a 0D architecture, in which the A-type Anderson anion [TeMo6O24]6− (TeMo6) is modified by two [Cu(pzca)(H2O)3]+ cations and two [K(H2O)5]+ cations. The adjacent {[K(H2O)5]2[Cu(pzca)(H2O)3]2(TeMo6O24)} clusters are connected by hydrogen-bonding interactions, resulting in a 3D supramolecular framework. When B-type Anderson anion [AlMo6(OH)6O18]3− (AlMo6) was used in compound 2, a 2D wave-like network was obtained, in which the adjacent 1D [Cu(pzca)] + chains are linked by AlMo6 anions with two terminal oxygen atoms. The types of Anderson anions play an important role in tuning the structures of the title compounds. In addition, the electrocatalytic activities of title compounds and photocatalytic activities of compound 1 have been studied.

Synthesis and characterization of three 2D Cd (II) coordination polymers built with terphenyl-2, 2′, 4, 4′-tetracarboxylate and flexible bis(imidazole)

Three new CdII coordination polymers, namely, {[Cd2 (L) (1, 2-bix)2(H2O)2]⋅2H2O}n(1), [Cd2 (L) (1, 3-bix)2]n (2), and {[Cd (H2L) (1, 4-bix) (H2O)2]⋅2H2O}n (3) [H4L=terphenyl-2, 2′, 4, 4′-tetracarboxylic acid, 1, n-bix=1, n-bis(imidazol-l-ylmethyl) benzene (n=2, 3, 4)], have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR, thermogravimetric analysis, and fluorescent analysis. Complex 1 is a 2D wavelike network structure incorporating the dinuclear Cd2 (1, 2-bix)2 units, whereas complex 2 possesses a 2D stair-like network structure consisting of the dinuclear Cd2O2 units. Complex 3 features a 2D puckered network constructed by 1D [Cd (H2L)]n and 1D [Cd (1, 4-bix)]n chains. The results show that the structural diversity of the polymers is mainly attributed to the usage of diverse ancillary bis (imidazol-1-ylmethyl)-benzene isomers ligands. The thermal stabilities and photoluminescence behaviors were also investigated.

Various pH-Dependent Copper(II) Coordination Architectures Constructed from N,N′-Di(3-pyridyl)succinamide and Two Different Dicarboxylates

Using a bis-pyridyl-bis-amide N,N′-di(3-pyridyl)succinamide (L) and two dicarboxylates as mixed ligands, four 2D copper(ii) metal–organic networks, formulated as [Cu(1,4-chdc)(L)]·3H2O (1), [Cu(1,4-chdc)(L)]·H2O (2), [Cu(2,5-tdc)(L)]·H2O (3), and [Cu(2,5-tdc)(L)]·2H2O (4) (L = N,N′-di(3-pyridyl)succinimide; 1,4-H2chdc = 1,4-cyclohexanedicarboxylic acid; 2,5-H2tdc = thiophen-2,5-dicarboxylic acid) have been hydrothermally synthesized under different pH conditions, and characterized by IR spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. Compound 1, formed at pH 5.4, contains two rare types of left-, right-handed [Cu-L]n helix chains, which are further connected by [Cu-1,4-chdc]n zigzag chains, affording a 2D wave-like polymeric network. Compound 2 was obtained at pH 5.9, and shows a 2D square-grid layer constructed from zigzag [Cu-L]n chains and linear [Cu-1,4-chdc]n chains. Compounds 3 and 4 possess a similar 2D grid layer to that of 2 with 44-sql topology, formed at pH 4.8 and 5.4 respectively, and are constructed from zigzag [Cu-L]n chains and linear [Cu-2,5-tdc]n chains. The effects of pH and secondary dicarboxylates on the diversity of structures are discussed. In addition, the thermal stabilities, photoluminescence properties, and photocatalytic activity of compounds 1–4 were also studied.

Construction of a series of lanthanide metal–organic frameworks: synthesis, structure, luminescence and white light emission

A series of new lanthanide metal–organic frameworks (Ln-MOFs) [Ln2(L)3(H2O)4]·2H2O (1) (Ln = Eu, Tb, Gd), and [Gd2(H2O)4(L)(C2O4)2]·3H2O (2) were synthesized based on 4-hydroxypyridine-2,6-dicarboxylic acid (H2L) under hydrothermal conditions. 1 exhibits isomorphous 2D wave-like networks constructed by paddle-wheel [Ln(L)3] units and LnO4(H2O)4 polyhedra. 2 shows a (4,4)-connected 3D framework with a Schlafli symbol of 66. Oxalic acid in the resulting framework of 2 is formed in situ under hydrothermal conditions. Luminescence studies indicate that 1-Eu and 1-Tb show characteristic red and green emissions of the corresponding Ln3+ ions, respectively, while 1-Gd and 2 exhibit blue emission arising from the H2L ligand. Then, by adjusting the co-doping ratio of three different Ln3+ ions into the same framework as that of 1, a novel doped Ln-MOF, [(Eu0.0073Tb0.0007Gd0.992)2(H2O)4(L)3]·2H2O (3), is successfully designed and synthesized, which shows white light emission upon excitation at 340 nm and its emission can also be switched between different colors. In addition, 1-Gd shows weak ferromagnetic interactions.

Four new coordination polymers constructed using 2,2′-oxybis(benzoic acid) and auxiliary N-donor ligands: Syntheses, structures, magnetic behavior and DFT studies

Four new coordination polymers [Cu(oba)(phen)] (1), [Co(oba)(phen)] (2), [Ni2(oba)2(bpe)] (3) and [Ni(oba)(bpe)1.5]·2.5H2O (4) [H2oba=2,2′-oxybis(benzoic acid), phen=1,10-Phenanthroline, bpe=1,2-bis(4-pyridyl)ethylene] were synthesized by hydrothermal reactions and characterized by single-crystal X-ray diffraction, thermogravimetric analyses, IR spectroscopy and elemental analysis. Compound 1 shows a discrete binuclear structure. Compound 2 is a right-handed 1D helical chain, though π–π stacking interactions to form a 2D wavelike network. Compound 3 displays a 2D wavy layer with the paddle-wheel SBUs. Compound 4 features a 2-fold interpenetrating 3D structure with 2D brick-wall networks. The magnetic properties of compounds 1, 2 and 4 have also been investigated. According to the crystal structures, the full geometry optimizations of compounds 1–4 were carried out by using hybrid DFT methods at B3LYP/6-31G(d) level. Meantime, the DFT-BS approach was applied to study the magnetic coupling behavior for compounds 1, 2 and 4, the result reveals that the calculated exchange coupling constants J were in good agreement with the experimental data.

Homochiral Layered Coordination Polymers from Chiral N-Carbamylglutamate and Achiral Flexible Bis(pyridine) Ligands: Syntheses, Crystal Structures, and Properties

Four new homochiral two-dimensional (2D) coordination polymers, namely, [Zn2L(NCG)2(H2O)2·4H2O]n (1), [Zn(bpe)(NCG)·3H2O]n (2), [Zn(bpe)(NCG)(NaNO3)0.5H2O]n (3), and [Zn(bpp)(NCG)·3.5H2O]n (4) (NCG = N-carbamylglutamate, L = 1,2-bis(4′-pyridylmethylamino)ethane, bpe = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane), have been prepared under mild conditions. The structures of CPs 1–4 were determined by single-crystal X-ray diffraction analysis. Complexes 1 and 2 display novel homochiral wavelike networks, with adjacent layers stacked in an AA type arrangement. Complex 3 shows an interesting 2D double-layered framework, which is further connected to form a 3D supermolecular structure through hydrogen bonding and aromatic π–π stacking interactions. The 2D structure of complex 4 contains two uncommon helical chains of bpp and NCG, with two flexures in each single strand. Different layers are stacked in an offset ABAB fashion. The mixed-ligand strategy, cooperation of a chiral and an achiral ligand,...

Assembly, structures and properties of four Cu(II) coordination polymers based on a semi-rigid bis-pyridyl-bis-amide ligand and different polycarboxylates

Four new Cu(II) coordination polymers, namely, [Cu(3-bpah)(1,4-NDC)(H2O)]·3H2O (1), [Cu2(3-bpah)(1,4-NDC)2]·(1,4-H2NDC)·3H2O (2), [Cu(3-bpah)(3-NIP)] (3), [Cu(3-bpah)(1,3,5-HBTC)]·2H2O (4), where 3-bpah=N,N′-bis(3-pyridinecarboxamide)-1,2-cyclohexane, 1,4-H2NDC=1,4-naphthalenedicarboxylic acid, 3-H2NIP=3-nitrophthalic acid, 1,3,5-H3BTC=1,3,5-benzenetricarboxylic acid, have been synthesized under hydrothermal conditions. The structures of 1–4 have been determined by single crystal X-ray diffraction and were further characterized by infrared spectroscopy (IR) and thermogravimetric analyses (TGA). Complex 1 displays a 1D double strand. Complex 2 shows a 3D α-Po framework with 1,4-H2NDC guest molecules inside the cages. Complex 3 reveals a 2D wave-like network. Complex 4 exhibits a 2D sql topology. The structural discrepancies of complexes 1–4 imply that the O-donor ancillary ligands play an important role in the formation of the resultant structures of the title coordination polymers. The fluorescent, electrochemical and photocatalytic properties of complexes 1–4 have been studied.

Effects of Metal Ions and N-Donor Ligands with Different Coordination Characters on the Construction of d10 Metal-organic Complexes with Selective Photocatalytic Activities

Four new d10 metal-organic coordination polymers, [Zn(L)(phen)(H2O)] (1), [Cd(L)(phen)] (2), [Zn(L)(bppdc)]·3H2O (3), and [Cd(L)(bppdc)]·3H2O (4) [L=2-carboxymethylsulfanyl nicotinic acid, phen=1,10-phenanthroline, bppdc=N;N`-bis(pyridin-3-yl)pyridine-2,6-dicarboxamide], have been obtained from hydrothermal reactions of zinc(II)=cadmium(II) nitrates with the semi-rigid N-= S-containing dicarboxylate L, and the two structurally disparate neutral N-donor ligands phen and bppdc. Single-crystal X-ray diffraction analysis has revealed that compound 1 is a one-dimensional (1- D) helical coordination polymer linked by ZnII atoms and L spacers. Compound 2 features a doublechain structure connected via binuclear CdII units and pairs of L linkers. Adjacent chains of 1 and 2 are packed into 3-D supramolecular networks by hydrogen bonds and p-p stacking interactions. Compounds 3 and 4 exhibit similar 2-D (4,4)-connected wave-like networks based on linear [M-L]n and zigzag [M-bppdc]n metal-organic chains (M=ZnII for 3 and CdII for 4). The effects of metal ions and N-donor ligands with different coordination characters are discussed. Moreover, the photoluminescence properties and photocatalytic activities of compounds 1 - 4 were investigated.

A novel lanthanide-organic wave-like network with 1H-Imidazole-4,5-Dicarboxylate and oxalate: Structure, photoluminescence, and magnetic properties

The solvothermal reaction of lanthanide nitrate and H4Diida ligand (H4Diida = 2-(4,5-dicarboxy-1H-imidazol-2-yl)-1H-imidazole-4,5-dicarboxylic acid) in the presence of ammonium oxalate results in a new three-dimensional (3D) lanthanide-organic framework, namely, {[Pr(Ida)(μ2-C2O4)0.5(H2O)2] · H2O}n (H2Ida = 1H-imidazole-4,5-dicarboxylic acid). H4Diida ligand can be in situ into Ida2− ions under the conditions, as unequivocally proved by these similar situations occurred in other systems. Single crystal X-ray diffraction analysis reveals the formation of a novel wave-like structure. It crystallizes in the monoclinic system, space group of P21/c. The polymer is built from two kinds of parallel alternately 1D infinite chain through the carboxylate double-linking adjacent Pr3+ cations, forming an extended 2D bilayer-like structure along the yz plane. Moreover, the polymer further stacks via weak interactions to generate a 3D supramolecular framework. The photoluminescence and magnetic properties for the polymer were also investigated and discussed.

A Novel Lanthanide-Organic Wave-Like Network with 1H-Imidazole-4,5-Dicarboxylate and Oxalate: Structure, Photoluminescence, and Magnetic Properties

A Novel Lanthanide-Organic Wave-Like Network with 1H-Imidazole-4,5-Dicarboxylate and Oxalate: Structure, Photoluminescence, and Magnetic Properties

Four M(II)-coordination polymers (M = Zn(II) and Cd(II)) based on a flexible 1,2-bis(pyridin-3-yloxy)ethane ligand: Syntheses, structures and photoluminescent properties

Four coordination polymers, namely {[Zn(L)2](ClO4)2}n (1), [Zn(L)(ipa)]n (2), [Cd(L)(chdc)⋅2H2O]n (3) and [Cd(L)0.5(pydc)⋅0.5H2O]n (4) (H2ipa=isophthalic acid, H2chdc=cyclohexane-1,4-dicarboxylic acid, H2pydc=pyridine-2,6-dicarboxylic acid), have been synthesized based on a flexible ligand 1,2-bis(pyridin-3-yloxy)ethane (L) under hydrothermal conditions. Their structures are determined by X-ray single-crystal analyses, IR spectra and X-ray powder diffractions (XRPD). In 1, the infinite 2D square sheets arrange regularly to form 1D channels containing ClO4- anions. 2 exhibits wave-like network, which is further extended into a 3D framework via interlayer C−H⋯X (X=π, O) interactions. With different co-ligands, 3 shows a 2D structure, while 4 exhibits a intriguing 3D supramolecular framework. In 1–4, L adopts different conformations in the solid state. The various conformations of L, with the different co-ligands, play an important role in structural diversity. The thermogravimetric analyses and photoluminescent properties of them were also investigated.