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1.
The in situ reaction of Cd(ClO 4) 2·6H 2O with 7-oxabicyclo[2.2.1]-5-heptene-2,3-dicarboxylic anhydride in the presence of lithium hydroxide affords a 2-D Cd II coordination polymer, [Cd( L)(H 2O)] ∞ ( 1) ( L?=?7-oxabicyclo[2.2.1]-5-heptene-2,3-dicarboxylate), which exhibits an unusual (3,6)-connected (4 6.6 6.8 3)(4 3) 2 CdI 2-type topology. The luminescent and thermal properties of 1 were investigated. 相似文献
2.
Two new compounds, [Cd 2(bptc)(bpimb)(H 2O)]?·?2H 2O ( 1) and [Cd 2(bptc)(bpib)]?·?4H 2O ( 2) (where H 4bptc?=?biphenyl-3,3′,4,4′-tetracarboxylic acid, bpimb?=?1,3-bis((2-(pyridin-2-yl)-1 H-imidazol-1-yl)methyl)benzene, bpib?=?1,4-bis(2-(pyridin-2-yl)-1 H-imidazol-1-yl)butane), were synthesized by reactions of the corresponding metal salts with H 4bptc and N-containing auxiliary ligands and their structures have been determined by single-crystal X-ray diffraction. Compound 1 is built by Cd 4-clusters which further construct a 3-D (3,8)-connected framework with tfz-d notation; 2, also built by Cd 4-clusters, is a 3-D (4,8)-connected framework with (3 2?·?4 2?·?5 2)(3 4?·?4 8?·?5 12?·?6 4) topology. In addition, the elemental analyses, infrared spectra, fluorescence, and thermogravimetric analyses for 1 and 2 are discussed. 相似文献
3.
Five lanthanide(III) coordination polymers with 2-methyl-1 H-imidazole-4,5-dicarboxylic acid (H 3MIDC) and ammonium oxalate, {[(Ln1) 2(HMIDC) 2(C 2O 4)(H 2O) 3]?·?3H 2O} n (Ln1?=?Nd ( 1), Sm ( 2)), {[Eu 2(HMIDC) 2(C 2O 4)(H 2O) 3]?·?0.5EtOH?·?3H 2O} n ( 3), {[Ce 2(HMIDC) 2(C 2O 4)(H 2O) 3]?·?EtOH?·?3H 2O} n ( 4), and {[Gd 2(HMIDC) 2(C 2O 4)(H 2O) 3]?·?MeOH?·?3H 2O} n ( 5), have been prepared and structurally characterized. Single-crystal X-ray diffraction analyses reveal that 1 and 2 are isostructural, as are 3, 4, and 5. Each exhibits a 3-D open framework, which is built by a regular 2-D grid connected by HMIDC 2? and Ln(III). The luminescence and thermal properties of these complexes have been investigated as well. 相似文献
4.
A Co II coordination polymer, {[Co( L)(bipy)(H 2O) 2](H 2O) 2} ∞ ( 1), with 4-(5-mercapto-1 H-tetrazol-1-yl)benzoate ( L) and 4,4′-bipyridine (bipy), was synthesized and structurally characterized by single-crystal X-ray diffraction analysis. Complex 1 has a (4,4) 2-D network structure, which is further interlinked by inter-layer O–H ··· O hydrogen-bonding interactions to form a 2-fold interpenetrated binodal (3,5)-connected 3-D hydrogen-bonded (6 3)(6 8 · 8 2) topology. The magnetic properties of 1 feature weak antiferromagnetic coupling. 相似文献
5.
Four new complexes, [Cu(L)] ( 1), [Cu 2(L)(dpe) 0.5]?·?2.5H 2O ( 2), [Mn(L)] ( 3), and [Mn(L)(pybim)] ( 4) [H 2L?=?5-(benzimidazol-1-ylmethyl)isophthalic acid, dpe?=?1,2-di(pyridin-4-yl)ethylene, pybim?=?2-(pyridin-2-yl)-1H-benzimidazole], have been synthesized under hydrothermal conditions and characterized by single-crystal and powder X-ray diffractions, FT-IR, and elemental analysis. The crystal structural analyses reveal that 1 and 4 are uninodal 3-connected 2-fold interpenetrated 2-D networks with (6 3) topology, 2 shows an infinite 1-D double-stranded chain structure, and 3 exhibits a uninodal 4-connected 2-D network with (4 4?·?6 2) topology. The factors influencing the structures of the coordination polymers are discussed. In addition, the thermal stabilities of 1– 4, second-order non-linear optical effect of 1, and preliminary magnetic property of 3 have also been investigated. 相似文献
6.
Two new Zn II complexes, {[Zn( L)(phen)(H 2O)]?·?H 2O} ∞ ( 1) and {[Zn( L)(4bpy)(H 2O)]?·?H 2O} ∞ ( 2) ( L?=?5,6-dihydro-1,4-dithiin-2,3-dicarboxylate, phen?=?1,10-phenanthroline, and 4bpy?=?4,4′-bipyridine), have been prepared by in situ reaction of Zn(ClO 4) 2?·?6H 2O with 5,6-dihydro-1,4-dithiin-2,3-dicarboxylic anhydrate in the presence of lithium hydroxide, together with incorporating chelating phen or bridging 4bpy as co-ligands. Their structures were determined by single-crystal X-ray diffraction. Complex 1 takes a 1-D helical structure that is further assembled into a 2-D network by O–H?···?O, C–H?···?O hydrogen bonds, and weak S?···?S interactions, and then an overall 3-D supramolecular framework was formed by π?···?π stacking interactions. Complex 2 possesses a 2-D (4,4)-layered structure. The structural difference between 1 and 2 can be attributed to the different N-donor auxiliary co-ligands. Both 1 and 2 are photoluminescent materials whose emission properties are closely related to their intrinsic structure. 相似文献
7.
Three Fe III2Ln III2 tetranuclear heterometallic clusters, [H 4LGd(H 2O)Tp*Fe(CN) 3] 2·8H 2O·2MeOH ( 1) and [H 4LLn(MeOH)Tp*Fe(CN) 3] 2·6MeOH·2MeCN (Ln?=?Tb and Dy for 2 and 3, respectively, H 6L = N, N′-(2,6-pyridine-dicarboxyl)-disalicylhydrazide, Tp* = hydridotris(3,5dimethylpyrazol-1-yl)-borate), were synthesized by use of the [(Tp*)Fe(CN) 3] ? unit as a metalloligand toward LnCl 3 and H 6L species. Structural analyses reveal that Fe III and Ln III ions in all complexes are connected to each other by one cyanide to form a heterobinuclear unit of [Ln(H 4L)][(Tp*)Fe(CN) 3], which is dimerized through Ln–N–C?=?O–Ln interaction. Magnetic susceptibility measurements show weak antiferromagnetic interactions between cyano-bridged Fe III and Gd III ions and amide-bridged Gd III ions are operative. Complex 1 displays the magnetocaloric effect with ?Δ Smmax = 12.70 J·kg ?1·K ?1 at 4.0 K for Δ H?=?7 T. No single-molecule magnetic properties are observed for 2 or 3 down to 1.8 K. 相似文献
8.
Three Cu(II) complexes, Cu 2(bpy)(H 2O)(Clma) 2 ( 1), Cu 2(bpe)(H 2O) 2(Clma) 2 ( 2), and Cu(bpp)(Clma) ( 3), were synthesized (HClma = ( R)-2-Chloromandelic acid, bpy?=?4,4′-dipyridine, bpe?=?1,2-di(4-pyridyl)ethylene, bpp?=?1,3-di(4-pyridyl)propane). Complexes 1, 2, and 3 are constructed from 1-D coordination arrays generated from Cu 2(H 2O)(Clma) 2, Cu 2(H 2O) 2(Clma) 2, and Cu 2(Clma) 2 moieties and linked through bpy, bpe, and bpp co-ligands, respectively. 1 and 2 are assembled into 3-D supramolecular networks via O–H?O hydrogen bonds with topology of (6 3)(6 9·8) and (4 12·6 3), respectively, and 3 is assembled into a 3-D architecture through C–H?O hydrogen bonds with topology of (4 3·6 3)(4 3)(4 4·6 5·8)(4 6·6 6·8 3). Compounds 1, 2, and 3 crystallized in acentric space groups P21, P1, and P21, which exhibit significant ferroelectricity (remnant polarization Pr?=?0.008?μC?cm ?2, coercive field Ec?=?21.4?kV?cm ?1, the spontaneous saturation polarization Ps?=?0.167?μC?cm ?2 for 1, Pr?=?0.183?μC?cm ?2, Ec?=?1.69?kV?cm ?1, and Ps?=?0.021 μC?cm ?2 for 3). Results from infrared and thermal analyses are also discussed. 相似文献
9.
Two coordination complexes, [Co 2L 2(4,4′-bpy) 2(H 2O) 4]?·?6H 2O ( 1) and [CoL(4,4′-bpy)] ( 2) (H 2L?=?4,6-bis(4-methylbenzoyl)isophthalic acid and 4,4′-bpy?=?4,4′-bipyridine), have been synthesized with the same starting materials under conventional and hydrothermal condition, respectively. Their structures have been characterized by X-ray diffraction, elemental analysis, IR spectra, and thermogravimetric analysis. Complex 1 features a 2-D sheet structure (space group C2/ c) with (4,4) grid units. The non-covalent interactions (O–H?·?·?·?O, C–H?·?·?·? π, and weak π??·?·?·? π interactions) extend 1 into a 3-D supramolecular network. Complex 2 displays a (3,5)-connected network (space group P 1) with a (4 2?·?6)(4 2?·?6 8) topology. 相似文献
10.
Reactions of Zn(II) salts, 5-(4-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT) and 2-mercaptobenzoic acid or 2-propyl-1H-imidazole-4,5-dicarboxylic acid (H 3PrIDC), result in two mixed-ligand coordination polymers (CPs), [Zn 2(IPT)(DSDB)(OH)] n (H 2DSDB = 2,2′-disulfanediyldibenzoic acid, 1) and [Zn 2(IPT)(PrIDC)(H 2O)] n (H 3PrIDC = 2-propyl-1H-imidazole-4,5-dicarboxylic acid, 2). Compound 1 possesses a 2-D structure built by 1-D [Zn(IPT)] n chains and DSDB 2? connectors, in which the DSDB 2? is generated via in situ reaction from 2-mercaptobenzoic acid. It displays a new intricate 4-nodal {3·4·6·7·8·9}{3·6·7·8·9·10}{3·8·9}{4·6·8} topology. Compound 2 displays a 3-D framework with new 3-connected topology with Schläfli symbol of (4·8·10) (8·12 2), in which the 1-D Zn-carboxylate chains were bridged by 3-connected IPT ? ligands. The thermal stabilities and luminescence properties of 1 and 2 have also been studied. The compounds exhibit intense solid-state fluorescent emissions at room temperature. 相似文献
11.
In the presence of Cu(II) ions, a chiral rare earth iodate Gd(IO 3) 3?·?H 2O (crystallizing in P21 (no. 4) space group), was synthesized hydrothermally from Gd 2O 3 and HIO 3; the structure is the topologically (3,?8)-connected (4 3)(4?·?6 2)(4 9?·?6 17?·?8 2) network, constructed from 3-connected trigonal nodes (I1, I3) and 8-connected tetragonal prism nodes (Gd1). 相似文献
12.
A 3-D metal-organic framework [Cd 3(L) 2(DMF) 2]?·?2H 2O?·?2DMF ( 1) (H 3L?=?2-(dimethylcarbamoyl)biphenyl-5,2′,5′-tricarboxylic acid, DMF?=? N, N-dimethylformamide) with trinuclear Cd(II) units has been prepared. Complex 1 is a (3,?6)-connected (4 2?·?6) 2(4 4?·?6 2?·?8 8?·?10) coordination net, which results from the solvothermal in situ formation of a new asymmetric ligand, 2-(dimethylcarbamoyl)biphenyl-5,2′,5′-tricarboxylic acid (H 3L), through amidation of biphenyl-2,5,2′,5′-tetracarboxylic acid (H 4bptc). Additionally, the luminescence of 1 has been investigated. 相似文献
13.
Three metal-organic frameworks, [Eu(C 10H 6N 3O 5) 3(H 2O) 2]?·?H 2O ( 1), [Tb(C 10H 6N 3O 5) 3(H 2O) 2]?·?H 2O ( 2), and [Cd(C 10H 6N 3O 5) 2Cl 2] ( 3) based on T-shaped tripodal ligands 3-(4,5-dicarboxy-1H-imidazol-2-yl)pyridine-1-oxide and 4-(4,5-dicarboxy-1H-imidazol-2-yl)pyridine-1-oxide (H 3DCImPyO), have been synthesized by the hydrothermal method and characterized by elemental analysis, IR, and single-crystal X-ray structure analysis. The diverse coordination modes of H 3DCImPyO ligands have afforded the three compounds. Complexes 1 and 2 are isomers and the Ln (Ln?=?Eu or Tb) atoms have coordination number eight with a distorted square prism geometry. The partly deprotonated H 2DCImPyO ? ligands display three different coordination modes to link Ln (Ln?=?Tb or Eu) into 1-D double chains. In 3, Cd(II) lies on an inversion center and displays a slightly distorted octahedral coordination. All three compounds exhibit strong fluorescent emissions in the solid state at room temperature. 相似文献
14.
Four 2-D coordination polymers Ln 2(phen) 2(C 5H 6O 4) 3 [Ln?=?Pr( 1), Eu( 2), Er( 3), Yb( 4), phen?=?1,10-phenanthroline] were obtained via hydrothermal reactions and determined by X-ray diffraction analysis. The crystal structure data reveal that these complexes are isostructural. In the asymmetric unit, the two Ln(III) ions are nine-coordinate and have similar coordination environments. The Ln(III) ions are built into 2-D layers by three different coordination modes of glutarate. The resulting 2-D layer forms 3-D supramolecular architecture by two types of π···π stacking interactions. All the complexes were characterized by IR spectra and thermogravimetric analysis, and the emission spectrum shows that Eu 2(phen) 2(C 5H 6O 4) 3 possesses strong luminescence. 相似文献
15.
Two new 3-D complexes, [M( L)(4bpy) 0.5(H 2O)] ∞ [M = Cd ( 1) and = Zn ( 2)], based on mixed 1,1-cyclobutanedicarboxylic acid (H 2L) and 4,4′-bipyridine (4bpy) have been synthesized; 1 and 2 feature (3,4)-connected (6 3)(6 5.8) topological networks consisting of pillared 2-D [M( L)(H 2O) ]∞ layered motifs. Complexes 1 and 2 are photoluminescent materials. 相似文献
16.
The reaction of α-[SiMo 12O 40] 4? with trivalent cations Ln 3+ and N-methyl-2-pyrrolidone leads to a series of complexes of formula [Ln(NMP) 4(H 2O) n ]H[SiMo 12O 40]?·?2NMP?·? mH 2O [where Ln?=?La ( 1), Pr ( 2), Nd ( 3), Sm ( 4), Gd ( 5), n?=?4, Ln?=?Dy ( 6), Er ( 7), n?=?3. NMP?=? N-methyl-2-pyrrolidone]. The syntheses, X-ray crystal structures, IR, and ESR spectra and thermal properties of the complexes 1, 2, 4, 6, 7 have been reported previously. Here, we report X-ray crystal structures, IR, UV, ESR spectra and thermal properties of the complexes [Nd(NMP) 4(H 2O) 4]H[SiMo 12O 40]?·?2NMP?·?1.5H 2O (3), and [Gd(NMP) 4(H 2O) 4]H[SiMo 12O 40]?·?2NMP?·?H 2O (5). In addition, the electrochemical behaviour of this series of complexes in aqueous solution and aqueous-organic solution has been investigated and systematic comparisons have been made. All these complexes exhibit successive reduction process of the Mo atoms. 相似文献
17.
An inorganic–organic hybrid material based on Dawson polyoxometalates, [Na 2{Cu I2(bim) 2} 2(P 2W 18O 62)]·2H 2O (bim = biimidazole) ( 1), has been hydrothermally synthesized and fully characterized. In 1, each {P 2W 18} cluster as a hexa-node ligand connects to six adjacent Dawson clusters via six Na1 ions to generate a pure inorganic 2-D layer, further joined by bimetal–organic segments [Cu 2(bim) 2] 2+ to form a 3-D inorganic–organic hybrid framework with channels. The structure can be simplified to 3,8-connected 3-D networks with (4 3)(4 18·6 24·8 3) topology, which shows bifunctional electrocatalytic performance for oxidation of ascorbic acid (AA) and reduction of nitrite (NO 2?), and high-efficient degradation ability for three typical dyes under UV light irradiation. 相似文献
18.
Two new complexes, {[Zn(imb)(SO 4)]·H 2O} n ( 1) and {[Cd 2(imb) 2(SO 4) 2(H 2O)]·CH 3OH} n ( 2) (imb?=?2-(1 H-imidazol-1-methyl)-1 H-benzimidazole), have been solvothermally synthesized. Single-crystal X-ray diffraction shows that 1 displays a 2-D (4,4) network, which is further extended to a 3-D supramolecular structure by hydrogen bonding interactions. Complex 2 exhibits a 3-D framework with (3,5)-connected (4 2·6) 2(4 2·6 5·8 3) 2 topology. The results indicate that changing metal ions can influence the coordination modes of sulfate, and then affect the structures of the complexes. In addition, IR and UV–vis spectra, powder X-ray diffraction patterns, thermogravimetric analyses, and fluorescent properties of both complexes have been investigated. 相似文献
19.
Hydrothermal reaction of 1,2,4-triazole with CdCl 2?·?2.5H 2O generated a 3-D metal-organic framework, {[Cd 3Cl 2(Trz) 4]?·?H 2O} n ( 1) (Trz?=?1,2,4-triazole), which was characterized by elemental analysis, FT-IR, X-ray powder diffraction, X-ray single-crystal diffraction, TG/DTA, and photoluminescence measurements. Compound 1 crystallizes in the orthorhombic system, space group Pnma, a?=?16.906(3)?Å, b?=?8.3151(17)?Å, c?=?13.080(3)?Å, V?=?1838.6(6)?Å 3, Z?=?4. Cd(1) is coordinated by four nitrogen atoms and one chloride to form a distorted trigonal-bipyramidal geometry. Cd(2) is an octahedron defined by four triazole nitrogen atoms and two chlorides. Two Cd(2) and one Cd(1) are linked by μ 3-Cl(1) to give a [Cd 3Cl] cluster, which is connected by μ 2-Cl(2) to generate a 1-D inorganic chain. The 1-D inorganic chains are extended by μ 3-Trz to form a 2-D hybrid layer in the b, c-plane, which is ultimately linked by residual triazole ligands to give a 3-D framework. The [Cd 3Cl] clusters and the Trz ligands can be regarded as 9- and 3-connected nodes, which lead to an unusual (3,9)-connected net with Schläfli symbol of (4 23?·?6 13)(4 3). The solid 1 exhibits high thermal stability and shows strong blue fluorescence emission at 410?nm in the solid state at ambient temperature. 相似文献
20.
Two metal coordination polymers, namely {[Co(1,3-BIP)(OBA)]·0.5H2O}n (SNUT-1) and [Co2(µ-η1:η1-O2)(1,3-BIP)2(PMA)]n (SNUT-2), where 1,3-BIP?=?1,3-bis(imidazol)propane, H2OBA?=?4,4′-oxybis(benzoate) and H4PMA?=?benzene-1,2,4,5-tetracarboxylic acid, were prepared by hydrothermal methods. Single-crystal X-ray analysis revealed that the structure of SNUT-1 consists of a 3D?→?3D twofold interpenetrating network that can be described as a 4-connected uninodal net with (65·8) topology. The structure of SNUT-2 consists of a 3D framework which can be described as a (4,5)-connected binodal net with (42·63·84·10) (33·42·5) topology. The gas adsorption properties of SNUT-1 and photocatalytic activity of SNUT-2 for the degradation of Rhodamine B have been explored. 相似文献
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