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1.
Two cobalt(II) homometallic complexes, [Co2(HTDA)2(H2O)6·2H2O] (1) and {[Co3(TDA)2(H2O)8]·H2O}n (2) (H3TDA = 1H-1,2,3-triazole-4,5-dicarboxylic acid) have been synthesized and structurally characterized in detail. Single-crystal X-ray crystallographic study reveals that they crystallize in trigonal space group R-3 and orthorhombic space group Pna21, respectively. In 1, two Co2 + cations are bonded by two HTDA2 − ligands to generate a binuclear CoII unit, which can further be extended to a 3D supermolecular structure via the hydrogen bonds. At variance with 1, the nearest Co2 + cations of 2 are connected via TDA3 − ligands to form a 1D coordination polymer and can be further linked to each other to result in a 3D supermolecular framework through the hydrogen bonding interactions as well. The magnetic properties of them were studied in detail. 相似文献
2.
A new Co(II) coordination polymer, namely [Co6(btc)4(dtb)2(H2O)3]n (1) (H3btc = 1,3,5-benzenetricarboxylic acid, dtb = 1,3-di-(1,2,4-triazole-4-yl)benzene), has been synthesized by combining the mixed ligands of H3btc and dtb with Co(Ac)2·4H2O under solvothermal conditions. Single-crystal X-ray diffraction analysis reveals that 1 feature a 3D open framework with intersecting channels based on Co-btc3 − layers and btc3 − and dtb pillars. The magnetic property of the complex has also been investigated at room temperature. 相似文献
3.
《Inorganic chemistry communications》2007,10(7):849-852
The title compound [Co(en)2(H2O)]{[Co(en)2]2As8V14O42(SO4)} · 3H2O (1) (en = ethylenediamine) has been hydrothermally synthesized and characterized by single crystal X-ray diffraction, IR spectrum and thermogravimetric analysis. The single crystal diffraction analysis shows that compound 1 exhibits {[Co(en)2]2As8V14O42(SO4)}n2n− layers act as ligand of coordination cations [Co(en)2]2+, and water molecules are inserted in the layers. The magnetic measurement indicates a weak antiferromagnetic exchange coupling within the molecular unit, which is deemed to attribute to the contribution of Viv and Co2+. 相似文献
4.
The cobalt(II)–lanthanide(III) heteronuclear complexes [Ln(H2O)4Co2(TTHA)(SCN)2]·H3O+ (H6TTHA = triethylenetetraaminehexaacetic acid, Ln = La(2), Ce(3)) have been synthesized based on a binuclear building block of [Co2(H2TTHA)(H2O)2] in [Co2(H2TTHA)(H2O)2]·4H2O (1). Single-crystal structures show that complex 1 is a binuclear complex, containing the [Co2(H2TTHA)(H2O)2] unit as a useful building block. Adding the La3 + and Ce3 + ions to this synthesis system, two new 3d-4f mixed complexes 2 and 3 were obtained. Complexes 2 and 3 show 3D framework, comprising an infinite 1D (one-dimensional) chain based on heterometallic Ln2Co2 (Ln = La(2), Ce(3)). Further investigations such as IR spectra, UV–vis spectra, TGA, XRD and magnetic properties were studied. 相似文献
5.
《Inorganic chemistry communications》2007,10(3):265-268
A cobalt coordination polymer {[Co2(btc)(μ3-OH)(H2O)2] · H2O}n 1 (btc = 1,2,4-benzenetricarboxylate) was synthesized hydrothermally and structurally characterized by single-crystal X-ray diffraction method. In 1, the six-coordinated Co(II) ions are held together by two bridging hydroxides to form a tetranuclear [Co4(μ3-OH)2] unit, which are connected further through btc3− ligands in a new μ7-bridging mode to give a porous three dimensional framework. The study of magnetic properties indicated dominant antiferromagnetic coupling interactions between the adjacent Co(II) sites. 相似文献
6.
An organic–inorganic hybrid 1D helical chain arsenomolybdate {[Cu(en)2][Cu(en)(H2O)][(Cu(en)2(H2O)] [AsIIIAsVMo9O34)]} · 2H2O (1) (en = ethylenediamine) has been hydrothermally synthesized and characterized by elemental analyses, IR, UV and CD spectrum, powder X-ray diffraction, TG-DTA and single-crystal X-ray diffraction. The asymmetric unit of 1 consists of a monocapped trivacant Keggin [AsIIIAsVMo9O34]6 − subunit, a pendant [Cu(en)2(H2O)]2 + cation, a pendant [Cu(en)(H2O)]2 + cation, one bridging [Cu(en)2]2 + cation and two lattice water molecules. It should be noted that 1 illustrates a one-dimensional (1D) helical chain assembled by {[Cu(en)(H2O)][(Cu(en)2(H2O)][AsIIIAsVMo9O34)]}2 − clusters and [Cu(en)2]2 + linkers. 相似文献
7.
Under similar hydrothermal synthetic conditions using a novel flexible ligand 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl)acetonitrile (PPAN), benzenedicarboxylate isomers (H2pa = phthalate, H2ip = isophthalate, and H2tp = terephthalate) and Cadmium(II) acetate, three novel mixed-ligand Cd(II) coordination polymers {[Cd2(PPAA)2(μ-pa)(H2O)]·2H2O}n (1), {[Cd4(PPAA)4 (μ4-ip)2]·2H2O}n (2) and {[Cd2(PPAA)2(μ-tp)]·2H2O}n (3) (PPAA− = 2-(3-(pyridin-2-yl)-1H-pyrazol-1-yl) acetate) have been isolated, in 1–3 PPAN, and are also hydrolyzed into a novel PPAA− ligand. Complex 1 is a 1D coordination polymer in which the tetra-nuclear [Cd4(PPAA)4]4 + structural units are extended by tri-dentate μ-pa2 − ligands. Complex 2 contains binuclear [Cd2(PPAA)2]4 + structural units, which are extended by four tetra-dentate μ4-ip2 − ligands to link eight neighboring binuclear [Cd2(PPAA)2]4 + units ultimately forming a 2D layered framework, while complex 3 contains 1D double chain containing [Cd(PPAA)]n cation structural units, which are further extended by tetradentate μ-tp2 − ligands to form a new 2D layered framework. All the complexes have been investigated by elemental analysis, FT-IR, thermal analysis and fluorescence characterization. The flexible coordination modes of PPAA− are also briefly analyzed. The flexible coordination modes of PPAA− and benzenedicarboxylate isomers also reveal great potential in the construction of these novel mixed-ligand luminescent frameworks with diverse structural motifs and unique functional properties. 相似文献
8.
By using a semi-rigid tripodal ligand 1,1′,1′′-(2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene)tripyridinium-4-olate) (L), six isomorphous lanthanum metal-organic frameworks (MOFs), namely, [Pr(L)2(Cl)2]·(Cl)(DMF)0.5·(H2O)·(1), [Nd(L)2(Cl)2]·(Cl)(2), [Tb(L)2(Cl)2]·(Cl)·(DMF)·(H2O)(3), [Eu(L)2(Cl)2]·(Cl)(DMF)·(H2O)(4), [La(L)2(Cl)2]·(Cl)(5), [Sm(L)2(Cl)2]·(Cl) (DMF)·(H2O) (6), were obtained and characterized by single crystal X-ray diffraction, IR and elemental analysis. Six compounds are isostructural with Ln3 + (Ln = Pr, Nd, Tb, Eu, La, Sm) and in which the Ln3 + is considered as a 6-connecting node and the L ligand is a 3-connecting node to afford a (3,6)-connected 2D layer with kgd topology, which further stacks into 3D supramolecular networks through C-H…O weak interactions. Luminescent properties of these lanthanide MOFs have also been assessed at ambient temperature, in which the Pr3 +-1 and the La3 +-5 are slightly blue-shifted with respect to the ligand. Series of sharp peaks characteristic of the Eu3 +-4, the Tb3 +-3 and Sm3 + − 6 metal-centered luminescence appear. The Nd3 +-2 has no emission. 相似文献
9.
Two organic–inorganic hybrid compounds with the formula {[MnIII(Salen)(H2O)]4MoO4}·Cl2·16H2O (1) and {[MnIII(Salen)(H2O)]4WO4}·(CH3COO)2·11H2O (2) (Salen = Di-[2-hydroxyl-3-methoxyl-benzaldehyde] ethylenediamine) have been synthesized and structurally characterized by IR, UV–vis spectroscopy, TG analysis and single crystal X-ray diffraction. Structural analysis revealed that compounds 1 and 2 consist of a [MoO4]2 − or [WO4]2 − building unit and four {[MnIII(Salen)(H2O)]+ metal–organic moieties, respectively. In the crystal structure, the [MoO4]2 − or [WO4]2 − tetrahedra coordinated with four MnIII ions, resulting in the penta-nuclear heterometallic tetrahedra cluster compounds, which were rarely observed in the Mn-Salen system. Magnetic study revealed that there was antiferromagnetic coupling in the two compounds. 相似文献
10.
Two rare-earth–isonicotinic-acid containing silicomolybdates [NH4]6[RE(INA)2(HINA)(H2O)3]2[α-SiMo12O40]2·6H2O [RE = NdIII (1), ErIII (2); HINA = isonicotinic acid] have been synthesized in the conventional aqueous solution and characterized by elemental analyses, IR spectra, UV spectra and single-crystal X-ray diffraction. Both 1 and 2 crystallize in the triclinic P–1 space group and consist of two typical Keggin [α-SiMo12O40]4 − polyanions, one isolated rare-earth-isonicotinic-acid [RE(INA)2(HINA)(H2O)3]22 + dimeric complex cation, six NH4+ ions and six lattice water molecules. Interestingly, two rare-earth ions are linked by four INA− ligands in the [Ln(INA)2(HINA)(H2O)3]22 + complex cation, which is very rare in polyoxometalate chemistry. The UV spectral measurements of 1 indicate that 1 is stable in aqueous solution in the pH range of 4.49–9.39. Furthermore, the electrochemical and electrocatalytic properties of 1 have been measured by cyclic voltammetry in 0.5 mol·L− 1 Na2SO4 + H2SO4 aqueous solution at the scan rate of 100 mV·s− 1. 相似文献
11.
A new metal-organic framework (MOF), [Cd2(bptc)(HCOO)]·NH2(CH3)2·3H2O (1), where H4bptc = 3,3′,5,5′-biphenyltetracarboxylic acid, was obtained by solvothermal reaction. The topology of MOF 1 is a (5,8)-connected net with {416 · 58 · 64}{44 · 56}2 point symbol. MOF 1 shows high stability in aqueous solution. Luminescence study indicates that MOF 1 possesses selective turn-on luminescent sensing functions towards Al3 + and Ca2 + ions in aqueous solutions. 相似文献
12.
A class of 3s–5d–4f mixed metal substituted sandwich-type arsenotungstates [H2N(CH3)2]8H3[LnNa(H2O)4(OH)WO(H2O) (B-α-AsW9 O33)2]·8H2O [Ln = LaIII (1), CeIII (2), PrIII (3)] have been isolated from an aqueous solution reaction system (pH = 4) of Na2WO4·2H2O, C2H7N·HCl, NaAsO2 and Ln(NO3)3·6H2O and structurally characterized by elemental analyses, IR spectra, UV spectra and single-crystal X-ray diffraction. It is the most prominent in 1–3 that the [LnNa(H2O)4(OH) WO(H2O)(B-α-AsW9O33)2]11 − polyanion consists of two trivacant Keggin [B-α-AsW9O33]9 − moieties linked by one [WO(H2O)]4 + group and a dimeric [LnNa(H2O)4(OH)]3 + group resulting in the special 3s–5d–4f mixed metal substituted sandwich-type assembly. Interestingly, lanthanide and sodium ions simultaneously occupy the two positions located at the central belt of 1–3 with the site occupancy of 50% for each position. Moreover, the electrochemical and electrocatalytic properties of only 1 and 2 have been measured by cyclic voltammetry (CV) in 0.5 mol·L− 1 Na2SO4 + H2SO4 aqueous solution. 1 and 2 illustrate electrocatalytic activities for the hydrogen peroxide reduction. 相似文献
13.
Presented in this communication are four metal complexes based on 2-propyl-4,5-dicarboxylate-imidazole (H3PIDC), including two Co(II) coordination compounds, [Co(H2PIDC)2(H2O)2] · 4H2O (1) and 2[Co(H2PIDC)2(H2O)2] · 5H2O (2), as well as two Zn(II) coordination compounds, [Zn(H2PIDC)2(H2O)2] · 4H2O (3) and 2[Zn(H2PIDC)2(H2O)2] · 7H2O (4). They contain the same coordinated unit of [M(H2PIDC)2(H2O)2] (M = Zn or Co). Interestingly, among these four complexes, 1 and 2, or 3 and 4 crystallized in different space group, which may be related with the number of the crystallized H2O molecules. 相似文献
14.
A novel metal-organic framework, [Co6(μ3-OH)4(ndc)4(bip)2(H2O)2]n (1)[H2 ndc = 1,4-naphthalenedicarboxylic acid, bip = 1,5-bis(imidazole-1-yl)pentane], constructed from unique [Co6(μ3-OH)4]8 +n chains containing alternate [Co4(OH)2]6 + and [Co2(OH)2]2 + subunits, was reported, which has a new (3,3,8,12)-connected or 12-connented fcu/cubic network and shows weak antiferromagnetic interaction between the adjacent Co(II) ions mediated through the carboxylate and hydroxyl groups. 相似文献
15.
Two inorganic–organic hybrids based on saturated α-Keggin-type germanomolybdates with mixed organic components [H2DAP]2[Cu(PA)2][α-GeMo12O40]·8H2O (1) and [NH4]2[H8L] [Cu(PA)2][α-GeMo12O40]·8H2O (2) (DAP = 1.2-diaminopropane, HPA = 2-picolinic acid, H6L = 1,3-bis[tris(hydroxymethyl)methylamino]propane) have been obtained via the conventional aqueous solution method and structurally characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis and single-crystal X-ray diffraction. 1 stands for an one-dimensional linear organic–inorganic hybrid germanomolybdate chain constructed from classical Keggin [α-GeMo12O40]4 − units supported by [Cu(PA)2] linkers, whereas 2 represents the first hybrid germanomolybdate containing the H6L component and consists of a saturated α-Keggin polyanion [α-GeMo12O40]4 −, a diprotonated [H8L]2 + cation, a copper coordination complex [Cu(PA)2], two ammonium cations [NH4]+ and eight lattice water molecules. Furthermore, the electrochemical and electrocatalytic properties of 1 and 2 have also been investigated in detail. 相似文献
16.
The new compound based on unconventional arsenomolybdate: {Co(btb)(H2O)2}2{H2As2Mo6O26}·2H2O (btb = 1,4-bis(1,2,4-triazol-1-y1)butane) (1) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, elemental analyses, IR, XPS, UV–vis-NIR and TG. Compound 1 consists of [H2As2Mo6O26]4 − polyoxoanion and {Co-btb} complexes, the polyoxoanion as a tetradentate node coordinated with the Co2 + ions forming the rhombic 2D interpenetrated layer structure, which is further extended the 3D topological structure with symbol {46 · 62 · 816 · 124}{49 · 66}2{4}2 by weak interaction. It shows obvious photocatalytic activities for the degradation of methylene blue (MB) and rhodamine-B (RhB). In addition, the electrocatalytic activity upon the reduction of nitrite also has been studied. 相似文献
17.
A new organic-inorganic hybrid compound constructed from [Mn2V22O64]10 − units, H6[(C6H4NO2Cu(H2O)4)]2[Mn2V22O64]·28H2O 1, has been synthesized and characterized by single-crystal X-ray diffraction, IR, powder X-ray diffraction (XPRD) and TG. Compound 1 is composed of dimeric [Mn2V22O64]10 − polyoxoanions, metal-organo fragments [(C6H4NO2Cu(H2O)4)]2 + and lattice water molecules. Moreover, a three-dimensional supramolecular structure is formed in 1 by the extensive hydrogen bond interaction among the terminal oxygen atoms of [Mn2V22O64]10 − anions, the coordinated waters of Cu2 + ions and crystal water molecules. Compound 1 exhibits remarkable catalytic activity for the heterogeneous oxidation of sulfides under mild condition. 相似文献
18.
A cyanide-bridged FeIII–CoII heterometallic complex {[Fe(1-CH3im)(CN)5][Co(H2O)2]}n·3H2O (1-CH3im = 1-methylimadazole) (2) has been synthesized by the reaction of CoII(ClO4)2·6H2O with the pentacyanideferrite(III) building block (Ph4P)2[FeIII(1-CH3im)(CN)5]·4.5H2O (1). X-Ray single crystal diffraction analysis shows that complex 2 has a two-dimensional (2D) grid-like structure. Magnetic investigations show that complex 2 displays long-range antiferromagnetic ordering with TN = 9.45 K. The typical metamagnetic behaviors were observed with the critical field of ca. 4000 Oe at 1.82 K. 相似文献
19.
One novel 3D cadmium coordination polymer, namely, {[Cd2(bptc4 −)(ox2 −)0.5(H2O)2] · 4.5H2O}n (1), has been hydrothermally synthesized through a reaction of 2,3′,4,5′-biphenyltetracarboxylic acid (H4bptc) with divalent cadmium salt in the presence of a second ligand (ox = oxalic acid). X-ray single crystal structure analysis reveals that tetranuclear cadmium clusters are formed by linking two Cd1 and two Cd2 ions with carboxyl groups. Each ox2 − ligand, with a bidentate chelating mode, connects two Cd2 ions from two adjacent tetranuclear clusters to afford 1D zigzag cadmium cluster chains. Furthermore, 1D chains are connected by bptc4 − ligands to extend a 3D framework with one-dimensional channels along the [001] direction. From a topology view, complex 1 exhibits an unprecedented 2-nodal 4, 10-connected net with the Schläfli symbol of {46}2{49. 512.622.72}. The luminescence analyses reveal that complex 1 shows an emission maximum at 437 nm, which may be attributed to the intra-ligand transition. A red shift of 31 nm compared with H4bptc ligand was observed and the luminescent decay lifetime is 2.74 ns, which indicates that it might be a potential blue light-emitting candidate. In addition, it was also characterized by elemental, IR spectra, PXRD and TG analyses. 相似文献
20.
A novel cerium(IV)-hybridizing selenotungstate with Dawson-like structure Na13H7[Ce(SeW17O59)2]·31H2O (1) has been synthesized by reaction of Na2WO4·2H2O, Na2SeO3 and (NH4)2Ce(NO3)6 in the aqueous solution and characterized by elemental analysis, IR spectrum, UV spectrum, thermogravimetric analysis (TGA) and single-crystal X-ray diffraction. To the best of our knowledge, 1 stands for 1:2-type Dawson-like selenotungstate constructed from two identical [SeW17O59]12 − moieties combined via one Ce4 + ion. The Ce4 + cation displays a distorted square prismatic geometry defined by eight oxygen atoms from two [SeW17O59]12 − moieties. In the [Ce(SeW17O59)2]20 − polyoxoanion, the {SeO3} trigonal pyramid encapsulated into the [SeW17O59]12 − fragment is situated on the side close to the Ce4 + ion. The TGA curve of 1 reveals two steps of weight loss between 25 °C and 700 °C. Furthermore, the electrochemical and the electrocatalytic properties of 1 have been measured by cyclic voltammetry (CV) in 0.5 M Na2SO4 + H2SO4 aqueous solution. 相似文献