Xiuli Wang

Bohai University, Chinchow, Liaoning, China

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Publications (139)400.53 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Three octamolybdate-based metal-organic complexes constructed from a pyridyl-carboxylate ligand containing amide group 3-(2-pyridinecarboxylic acid)amido pyridine (HPCAP), namely, H2{[Cu3(PCAP)4(H2O)2](β-Mo8O26)}•10H2O (1), H{[Cu(PCAP)(H2O)](β-Mo8O26)0.5} (2) and H2[Co(H2O)6][Co2(PCAP)4(γ-Mo8O26)(H2O)2]•10H2O (3), have been successfully synthesized under hydrothermal or solvothermal (methanol-water mixed solvent) conditions. Single-crystal X-ray analyses reveal that compound 1 is a 2D layer based on the infinite 1D [Cu3(PCAP)4]n2n+ chains and the bidentate β-Mo8O264− anions. In compound 2, 1D “thin centipede” [Cu2(PCAP)2]n2n+ chains were connected by tetradentate β-Mo8O264− anions through Cu-O bond to form a 2D network. In compound 3, the γ-Mo8O264− anions were connected by adjacent [Co2(PCAP)4(H2O)2] moieties through Co–O and Mo–N bonds forming an uncommon 1D “fat centipede” chain. The adjacent chains were futher extended to a 2D supramolecular network through hydrogen bonding interaction. The title compounds represent the first examples of introducing pyridyl-carboxylate ligand containing amide group into the POMs system. The pH value, solvent and metal ions play key roles in the construction of final architectures and show great influence on the structural diversities of the title compounds. The electrochemical properties of compound 1 and photocatalysis properties of the title compounds have been reported.
    No preview · Article · Dec 2015 · CrystEngComm
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    ABSTRACT: Framework fragility upon the removal of guest solvent molecules has remained an issue for a substantial amount of metal-organic frameworks (MOFs). To address this issue, in this work we illustrate a strategy for the introduction of size-matching ligands as braces that are deliberately anchored onto the open metal sites to support and segment the pores thereby boosting the framework robustness. This is exemplified by employing 4,4'-bipyridine as a brace to bridge two trigonal prismatic clusters of Co3(μ3-O)(COO)6, generating a robust MOF that exhibits permanent porosity and selective gas adsorption behaviors.
    No preview · Article · Dec 2015 · Chemical Communications
  • Na Xu · Ju-Wen Zhang · Xiuli Wang · Tianjiao Li · Guocheng Liu
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    ABSTRACT: Three transition metal organopolymolybdate hybrid compounds, namely, H2[Mn(H2O)4L3(γ-Mo8O26)] 8H2O (), H[M2(CH3O)(H2O)6L3(γ-Mo8O26)] [M = Zn () and Co ()] [L = 1,4-bis(3-pyridinecarboxamido)benzene] have been synthesized under solvothermal conditions and characterized by IR spectroscopy, TG analysis, powder XRD and single-crystal X-ray diffraction. Compounds were obtained by the one-pot method, and the mixture of methanol and water with different ratios was used as the solvent. In compound , the γ-Mo8 anions were connected with pyridine groups of ligand L by the Mo-N bond, forming an uncommon 1D γ-Mo8-L chain. The adjacent chains were connected by [MnL2(H2O)4](2+) moieties through hydrogen bonding interaction to construct a 2D supramolecular network. Compounds and are isostructural, which show a 3D 2,4,6-connected {4(4)·6(2)}{4(4)·6(6)·8(4)·10}{6} framework. The γ-Mo8 anions were connected by [M(H2O)2(CH3O)](+) [M = Zn () and Co ()] subunits forming 1D M-Mo8 chains, which were connected by [ML2(H2O)4](2+) moieties to construct a 2D layer. In compounds and , there also exist the same 1D γ-Mo8-L chains as in , which extended the 2D networks to 3D frameworks. The Mo-N bond with pyridyl groups was formed under the solvothermal conditions, which is scarcely reported to our knowledge. The effect of the solvent on the assembly of the title compounds and the formation of the Mo-N bond, as well as the role of metal-organic moieties on the construction of diverse organopolymolybdate compounds have been discussed in detail. Furthermore, the electrochemical and photocatalytic properties of have been investigated.
    No preview · Article · Dec 2015 · Dalton Transactions
  • Xiuli Wang · Tianjiao Li · Aixiang Tian · Na Xu · Rui Zhang
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    ABSTRACT: Two new isopolymolybdate-based metal-organic complexes, [Cu2(2-ptz)2(Mo4O14)0.5] (1) and [Cu3(OH)2(3-ptz)4(γ-H4Mo8O26)(H2O)4]·10H2O (2) (2-ptzH = 5-(2-pyridyl)-1H-tetrazole, 3-ptzH = 5-(3-pyridyl)-1H-tetrazole), constructed from isomeric ligands with different N-donor sites were synthesized under hydrothermal conditions. In 1, each [Mo4O14]4- cluster connected with six neighboring [Mo4O14]4- clusters through six binuclear [Cu2(2-ptz)2]2+ subunits to yield a two-dimensional (2D) layer. In 2, bidentate inorganic [Mo8O26]4- anions link the trinuclear [Cu3(OH)2(3-ptz)4] clusters to construct a 1D chain. Adjacent chains connect through Mo-N bonds between the [Mo8O26]4- anions and pyridyl groups from the trinuclear clusters to form a 2D layer. The effect of the N-donor sites of the rigid isomeric ligands on the structures of 1 and 2 was discussed. The electrochemical properties and photocatalytic activities of 1 and 2 have also been studied.
    No preview · Article · Nov 2015 · Journal of Coordination Chemistry
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    ABSTRACT: In this study, an improved indirect cell coculture system was constructed by using a polyelectrolyte complex membrane generated by alginate (A) and chitosan (C). Methodologies of characterizing thickness and permeability of flat AC membrane were first established due to the importance of these two parameters in determining intercellular distance and degree of contact between cocultured cells. Compared to reaction time, both alginate concentration and molecular weight (Mw) of chitosan play more dominant roles in determining the membrane thickness and diffusion coefficients. Moreover, cells in the alginate gel and on the AC membrane could maintain high cell viability. Thus, an improved indirect cell coculture system constructed by flat AC membrane was fabricated and characterized, which provides a robust tool to study the effect of intercellular distance and degree of contact between cocultured cells on cell-cell interactions.
    No preview · Article · Nov 2015
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    ABSTRACT: A novel Wells-Dawson polyoxometalate (POM)-based metal-organic framework (MOF) constructed from bi(triazole) ligand and azo anion, namely, [Ag13(L)6(N2)(HP2W18O62)] (1) (HL = 4-(1 H-1,2,4-triazol-3-yl)-2 H-1,2,4-triazolyl) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR spectra, PXRD analysis. In compound 1, the rigid bi(triazole) ligands connected AgI ions to construct a 2D metal-organic layer, which was further extended by azo anions forming a 3D framework. The Wells-Dawson type [P2W18O62]6 - anion as a multidentate inorganic ligand coordinated with the AgI ions, consolidating the 3D MOF. The L ligands and azo anions were in-situ transformed from a bi(triazole) derivative, which has never been observed in previous reports. In addition, the electrocatalytic and photocatalytic properties of compound 1 have been investigated.
    No preview · Article · Nov 2015 · Inorganic Chemistry Communications
  • Xinxin Xu · Tingting Lu · Xiaoxia Liu · Xiuli Wang
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    ABSTRACT: A visible-light-active p-n heterojunction photocatalyst has been synthesized by the enwrapping of poly[aniline-co-N-(4-sulfophenyl)aniline] (PAPSA) on a coordination polymer nanoparticle (NCP). Compared with the visible-light-inactive NCP, the new p-n heterojunction photocatalyst, PAPSA/NCP, exhibits a much higher efficiency in the reduction of Cr(VI) under visible light. PAPSA performs two functions in this p-n heterojunction photocatalyst. First, as a visible-light-active material, it extends the photoresponse region of the photocatalyst from the ultraviolet to the visible-light region. Secondly, as a p-type semiconductor possessing suitable energy levels with respect to NCP, PAPSA forms a p-n heterojunction with the n-type NCP; the inner electric field of the p-n heterojunction accelerates the separation of electrons and holes, which enhances the photocatalytic efficiency. Furthermore, the p-n heterojunction photocatalyst exhibits outstanding stability during the photocatalytic reduction of Cr(VI) .
    No preview · Article · Oct 2015 · Chemistry - A European Journal
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    ABSTRACT: By using mixed rigid and flexible organic ligands, three Keggin based compounds, [Ag6(tbz)4(bmz)2(H3PW12O40)]·4H2O (), [Ag(H2bdpm)2(H2PMo12O40)]·7.5H2O (), and [Ag4(tbz)2(H2bdpm)2(HPMo12O40)]·2H2O () (Htbz = thiabendazole, Hbmz = benzimidazole, H2bdpm = 1,1'-bis(3,5-dimethyl-1H-pyrazolate)methane), were hydrothermally synthesized and structurally characterized. Through adopting rigid Htbz ligands, compound with hexa-nuclear Ag(I) clusters has been obtained. These hexa-nuclear clusters are linked by Keggin anions alternately to form a one dimensional (1D) chain. In compound , the organic moiety is the flexible H2bdpm ligand. The Keggin anions are fused by [Ag(H2bdpm)2](+) subunits to form a 1D chain. In compound , the rigid Htbz and the flexible H2bdpm cooperate to modify the anions. Two tbz and two H2bdpm are fused by four Ag(I) ions to construct a tetra-nuclear Ag(I) cycle. The anions connect these cycles through Ag-O bonds alternately to form a 1D chain. Adjacent chains arrange parallel to build a 2D layer. The chains in the adjacent layers are vertically packed and linked by Ag-O bonds to construct a 3D framework. The electrochemical and photocatalytic properties of the title compounds have been studied. Furthermore, we have also studied the Hg(2+) recognition properties in a suspension of compounds and .
    No preview · Article · Sep 2015 · Dalton Transactions
  • Xinxin Xu · Tingting Lu · Xiaoxia Liu · Xiuli Wang
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    ABSTRACT: A new p–n heterojunction photocatalyst has been synthesized successfully through chemical-bond-mediated combination of coordination polymer nanoplates (CPNPs) and partially reduced graphene oxide (PRGO) with a simple colloidal blending process. Photocatalytic H2 production by the p–n heterojunction photocatalyst PRGO/CPNP was investigated under visible-light irradiation, which illustrates that PRGO/CPNP exhibits a much higher photocatalytic H2 production rate than neat the CPNPs. The improvement of this photocatalytic property can be attributed to the inner electrical field formed in the p–n heterojunction, which impedes recombination of photogenerated electrons and holes. In PRGO/CPNP, the existence of the p–n heterojunction has been confirmed by electrochemical methods clearly. For PRGO/CPNP, the reductive degree of the PRGO has a great influence on the H2 production rate and an ideal condition to get a PRGO/CPNP photocatalyst with higher performance has been obtained.
    No preview · Article · Aug 2015 · Chemistry - A European Journal
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    ABSTRACT: A series of new Co(ii) complexes based on a new semi-rigid "V"-like bis-pyridyl-bis-amide derivative, namely, [Co(3-bpha)2(2,3-HPDC)2] (1), [Co(3-bpha)(3-NPH)(H2O)2]·2H2O (2), [Co(3-bpha)(1,3-BDC)]·4H2O (3), [Co(3-bpha)(HIP)]·3H2O (4), [Co(3-bpha)(MIP)(H2O)]·H2O (5), and [Co3(3-bpha)2(1,3,5-BTC)2(H2O)4]·2H2O (6) (3-bpha = N,N′-bis(pyridin-3-yl)-5-hydroxybenzene-1,3-dicarboxamide, 2,3-H2PDC = 2,3-pyridinedicarboxylic acid, 3-H2NPH = 3-nitrophthalic acid, 1,3-H2BDC = 1,3-benzenedicarboxylic acid, H2HIP = 5-hydroxyisophthalic acid, H2MIP = 5-methylisophthalic acid, 1,3,5-H3BTC = 1,3,5-benzenetricarboxylic acid), have been hydrothermally synthesized by tuning aromatic polycarboxylate co-ligands and characterized by single-crystal X-ray diffraction, IR spectra, powder XRD and TG analysis. Complex 1 is a discrete zero-dimensional (0D) structure in which the 3-bpha ligands and the 2,3-HPDC anions act as the terminal groups simultaneously to coordinate with the CoII ions. Complex 2 is a 1D meso-helical chain in which the 3-bpha ligands show a μ2-bridging mode and the 3-NPH anions act as the terminal groups. In complexes 3 and 4, pairs of 3-bpha ligands integrate with two CoII ions to generate 28-membered Co2(3-bpha)2 rings, which connect with the 1D [Co-1,3-BDC]n or [Co-HIP]n chains to create the 2D networks. In complex 5, the CoII ions are linked to 3-bpha ligands, resulting in a single-strand [Co-3-bpha]n helix chain, which is further connected to the MIP anions to form a 2D network. Complex 6 shows a 3D framework with (3,3,4)-connected (83)4(84·102) topology, which contains [Co-(1,3,5-BTC)]n 2D grid-like sheets and 1D [Co-3-bpha]n helical chains. Finally, the 0D discrete architecture in 1, 1D chain in 2, and 2D networks in 4 and 5 are extended to 3D supramolecular frameworks through hydrogen-bonding interactions. The effect of polycarboxylate auxiliary ligands with different substitute groups and different carboxyl positions and number on the assembly and structures of the target complexes were discussed. Moreover, the thermal stabilities, electrochemical properties and photocatalytic activities of complexes 1-6 were investigated.
    No preview · Article · Aug 2015 · CrystEngComm
  • HONGYAN LIN · HUIZHE LU · MAO LE · JIAN LUAN · XIULI WANG · GUOCHENG LIU
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    ABSTRACT: Three new transition metal coordination polymers [Cu(3-bpcb)0.5(5-AIP)] 2H2O (1), [Cd(3-bpc b)0.5(5-AIP)(H2O)] H 2O (2) and [Cd(3-bpsa)0.5(5-AIP)(H2O)] 2H2O (3) have been hydrothermally synthesized by self-assembly of 5-aminoisophthalic acid (5-H2AIP), semi-rigid or flexible bis-pyridyl-bis-amide ligands [3-bpcb = N N ′-bis(3-pyridinecarboxamide)-1,4-benzene, 3-bpsa = N,N ′-bis(3-pyridyl)succinamide], and copper chloride or cadmium nitrate. X-ray diffraction analysis reveals that compounds 1 and 2 possess similar 2 D double-layered structures with (3,4)-connected (63)(658) topology, while compound 3 displays a 2 D layer with {62.10}{6} topology. The adjacent layers of 1-3 are finally extended into 3 D supramolecular frameworks by hydrogen bonding interactions. The bis-pyridyl-bis-amide ligands with different flexibilities play an important role in the construction of final topological structures for the title compounds. Further, the electrochemical behavior of the compound 1 and the fluorescent and photocatalytic properties of compounds 1-3 have been investigated. [Figure not available: see fulltext.]
    No preview · Article · Jul 2015 · Journal of Chemical Sciences
  • Xiuli Wang · Mao Le · Hongyan Lin · Jian Luan · Guocheng Liu · Danna Liu
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    ABSTRACT: Three Cu(II) metal-organic frameworks (MOFs) based on 1,3,5-benzenetricarboxylic acid (H3BTC) and three aminopyridine derivatives with different length and coordination groups, namely [Cu2(3-ap)(HBTC)(H2BTC)(μ3-OH)(H2O)2] (1), [Cu2(3-ppca)(BTC)(H2O)3]•H2O (2), [Cu2(3-ebpba)(BTC)(μ3-OH)] (3) [3-ap = 3-aminopyridine, 3-ppca = N-(pyridin-3-yl)pyrazine-2-carboxamide, 3-ebpba = (E)-4,4'-(ethene-1,2-diyl)bis(N-pyridin-3-yl)benzamide)], have been hydrothermally synthesized and structurally characterized by elemental analyses, IR, PXRD, TG and single crystal X-ray diffraction analyses. The title MOFs display versatile structural features with 1D and 3D frameworks. Complex 1 exhibits a 1D ladder-like chain with tetranuclear copper clusters. Complex 2 shows a rare 3D framework, which features a (3,3,3,3)-connected topology with the Schläfli symbol of {8•10•12}2{82•10}2. Complex 3 exhibits a (3,8)-connected {4•62}2{42•622•7•83} topology based on tetranuclear copper clusters. The influence of aminopyridine-based ligands on the structures and properties of the title complexes has been discussed. The electrocatalytic and photocatalytic properties of complexes 1–3 have also been investigated in detail.
    No preview · Article · Jun 2015 · Dalton Transactions
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    ABSTRACT: Through tuning different kinds of polyoxometalates(POMs), four POM-based inorganic–organic hybrid compounds with different dimensionalities, [(H2L)2(Mo8O26)] (1), [CuⅡ2L6(P2W24O79)•4H2O]•7H2O (2), {[CuⅡ2L2(μ2-OH)[CrMo6(OH)6O18]•4H2O}•4H2O (3), {CuI2 CuⅡ2L2(μ3-OH)2[CrMo6(OH)5 O19]•6H2O}•4H2O (4) [L = 1,4-bis(3-pyridinecarboxamido)benzene], have been synthesized under hydrothermal conditions and characterized by IR spectroscopy, TG analysis, powder XRD and single-crystal X-ray diffraction. Single-crystal X-ray analyses reveal that compound 1 exhibits a two-dimensional (2D) supramolecular network, which is constructed from protonated L ligands and [Mo8O26]4− anions through hydrogen bonding interaction. Compound 2 is a 1D hybrid chain based on an uncommon inorganic [P2W24O79]4- chain and “Y”-like (CuL3)2+ subunits. Compound 3 shows a 2D network constructed from 1D inorganic Cu2–CrMo6 chains and bidentate L ligands, which is obtained at pH=4.1. When the pH was adjusted to 4.8, compound 4 is obtained and exhibits a 4-connected {66} 3D framework. The CrMo6 anions are connected by adjacent [CuI2CuII2(μ3-OH)2(H2O)6]4+ subunits to form 1D Cu4–CrMo6 inorganic chains, which are further extended by L ligands to construct the 3D network. The effect of different types of polyanions and pH value on the assembly and various structures of the title compounds has been discussed. Furthermore, the electrochemical properties of 1 and 2, the photocatalytic properties of 2 and 3 under different conditions have been investigated.
    No preview · Article · Jun 2015 · CrystEngComm
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    ABSTRACT: By introducing the flexible bis-pyrazine-bis-amide ligands into polyoxometalates (POMs) system, five POMs-based metal-organic complexes, {Cu3(L1)2[CrMo6(OH)6O18]2(H2O)2}•10H2O (1), [CuL1(Mo8O26)0.5]•H2O (2), [Cu2(L1)2(HPMoVI10MoV2O40) (H2O)2]•2H2O (3), [Cu2(L1)2(SiMo12O40)(H2O)2]•2H2O (4), [Cu2(L2)2(SiMo12O40)]•2H2O (5) [L1=N,N’-bis(2-pyrazinecarboxamide)-1,3-propane, L2=N,N’-bis(2-pyrizinecarboxamide)-1,6-hexane], were synthesized under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction analyses, elemental analyses, IR spectra, powder X-ray diffraction (PXRD) and thermal gravimetric analyses (TG). Single-crystal X-ray analysis reveals that compound 1 is a 1D infinite ribbon-like chain with Anderson type polyanions [CrMo6(OH)6O18]3- as building blocks. Compound 2 is a 2D layer constructed from 1D helical [Cu-L1]n2n+ chains and [Mo8O26]4- anions, in which the octamolybdates also act as inorganic building blocks. Compounds 3 and 4 are isostructural, and display 2D supramolecular networks based on the 1D [Cu-L1]n2n+ chains, in which the Keggin polyanions are serving as noncoordinated templates. Compound 5 is a 3D supramolecular framework constructed from the 2D [Cu-L2]n2n+ layers and the Keggin [SiMo12O40]4- polyanion templates. In compounds 1–4, the L1 ligands display same symmetric coordination mode with two chelating sites. When lengthening the spacer of ligand, L2 exhibits a asymmetric coordination mode in compound 5. The structural diversities of 1–5 show that the different polyoxoanions and spacer lengths of the ligands play key roles in the construction of various architectures. The title compounds represent the first examples of introducing flexible bis-pyrazine-bis-amide ligands into the POMs system. In addition, the electrochemical properties of compounds 2–5 and the photocatalytic activities of the title compounds on the degradation of methylene blue (MB) under UV, visible light and sunlight irradiation have been investigated in detail.
    No preview · Article · Jun 2015 · RSC Advances
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    ABSTRACT: By using two kinds of organic ligands 1-benzyl-1H-(1,2,4)triazole (2-btz) and 1-benzyl-1H-(1,3,4)triazole (3-btz), six polyoxometalate (POM)-based compounds were hydrothermally synthesized and structurally characterized, [Ag4(2-btz)4(HPMoV2MoVI10O40)] (1), [Ag4(2-btz)4(SiW12O40)] (2), [Ag4(2-btz)5K(SiWVWVI11O40)]13H2O (3), [Cu4(2-btz)16(Mo8O26)2] (4), [Cu3(3-btz)8(H2O)4](PMo12O40)24H2O (5) and [Cu7(3-btz)16(OH)2(H2O)4(P2W18O62)2]16H2O (6). Compounds 1 and 2 are isostructural with two sets of Ag-(2-btz) chains linked by Keggin anions to construct a “ladder”. Adjacent “ladders” are further connected by Ag1-O13 bonds to build a 3D framework. In compound 3, the anion dimers are linked by Ag5-O9 bonds to form a 1D chain. The chains are fused by Ag3 and K ions and a 3D framework of 3 is built. In compound 4, the Mo8 anions are linked by [Cu(2-btz)4]2+ subunits to construct a 3D structure. By changing 2-btz to 3-btz, we obtained a linear tri-nuclear cluster [Cu3(3-btz)8(H2O)4]6+ in compound 5. The discrete PMo12 anions combine with tri-nuclear clusters through hydrogen bonding interactions to construct a 2D supramolecular layer. Compound 6 contains a cycle tri-nuclear cluster-supporting anion [Cu3(3-btz)6(OH)(H2O)2(P2W18O62)]-, which are further connected by one [Cu(3-btz)4]2+ subunit to construct a discrete anion dimer. The title compounds show good electrocatalytic activities for reducing nitrite, hydrogen peroxide and bromate. These compounds also exhibit excellent photocatalytic activities for the degradation of methylene blue (MB, 16 as catalysts) and rhodamine B (RhB, 5 and 6 as catalysts). Additionally, the magnetic properties of compounds 5 and 6 have been investigated.
    No preview · Article · Jun 2015 · CrystEngComm
  • Xiang Wang · Rui Zhang · Aixiang Tian · Xiuli Wang
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    ABSTRACT: A Wells-Dawson Polyoxometalate-based hybrid, Ag9(trz)3(Htrz)4 (H2O)(P2W18O62)·3H2O (1) (Htrz = 1,2,4-1H-triazole) was hydrothermally synthesized through using trz ligand and silver nitrate in the presence of [P2W18O62]6– polyoxoanion. In the 3D framework structure of compound 1, two kinds of wave-like Ag/trz chains originated from trz ligands and silver cations are aggregated in a “2+1” mode by {Ag2/trz} linkages to result in a 1D Ag/trz metal-organic ribbon, which is further extended into a 3D framework structure by [P2W18O62]6– polyoxoanions through Ag-O covalent bonds. Additionally, the electrochemical properties of compound 1 have also been investigated.
    No preview · Article · Jun 2015 · Zeitschrift für anorganische Chemie
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    ABSTRACT: Eight new CdII/ZnII coordination polymers constructed from a semi-rigid “V”-like bis-pyridyl-bis-amide ligand and different dicarboxylates, namely, {[Cd(L)(tpd)(H2O)]·H2O}n (1), {[Cd(L)(bdc)(H2O)]·H2O}n (2), {[Cd(L)(mip)(H2O)]·H2O}n (3), {[Cd(L)(hip)(H2O)]·H2O}n (4), {[Zn(L)(tpd)(H2O)]·H2O}n (5), {[Zn(L)(bdc)(H2O)]·H2O}n (6), {[Zn(L)(mip)(H2O)]·H2O}n (7), {[Zn(L)(hip)]·2H2O}n (8), [L = N,N′-bis(pyridine-3-yl)-5-methylisophthalic dicarboxamide, H2tpd = 2,5-thiophenedicarboxylic acid, H2bdc = 1,3-benzenedicarboxylic acid, H2mip = 5-methylisophthalic acid, H2hip = 5-hydroxyisophthalic acid] have been hydrothermally synthesized and structurally characterized. In complexes 1 and 3–7, the L ligands adopt μ2–bridging mode connecting adjacent CdII/ZnII ions to give rise 1D left-, right-handed helixes. In complex 2, the L ligands connect adjacent metal ions to form a 1D right-handed helix. In complex 8, the L ligands link adjacent metal ions to obtain a 1D wave-like chain. The adjacent 1D [M-L]n (M = Cd, Zn) chains are further linked by dicarboxylates anions with monodentate-chelating or bis(monodentate) bridging mode to furnish 2D layer structures. The structural features of the title complexes indicate that the semi-rigid “V”-like bis-pyridyl-bis-amide L tends to construct 1D helix. In addition, the effects of central metals on the coordination modes of the dicarboxylates and the carboxyl position of dicarboxylates on the final structures have been discussed. The thermal stability and fluorescent properties of complexes 1–8 have been investigated. In addition, the title complexes exhibit photocatalytic activity and selectivity for dye degradation under UV light.
    No preview · Article · Jun 2015 · Inorganica Chimica Acta
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    ABSTRACT: In this paper, three new polyoxometalate (POM)-based metal-organic compounds containing silver cycles/belts, namely, [K2Ag15(L1)10(H2O)2][H(PMoVI11MoVO40)2] (1), [Ag7(L1)4][PW12O40]•2H2O (2) and [Ag10(L2)8(H2O)][PW12O40] (3) (L1 = 5-o-tolyl-1H-tetrazole, L2 = 5-m-tolyl-1H-tetrazole), have been obtained under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR spectra and powder X-ray diffraction (PXRD). The organic molecules L1 and L2 are isomeric. In compound 1, there exist 2D Ag-L1 layers including Ag belts, which are further linked by Ag5 to form a 3D metal-organic framework (MOF). The inorganic chain in 1 with Keggin anions linked by Ag1 ions insert into the channels of this 3D MOF. In compound 2, the Ag-L1 belts are connected by Keggin anions to construct a 2D layer. Adjacent layers link each other through Ag-O bonds and the 3D framework of 2 is built. In compound 3, the 2D Ag-L2 layer owns Ag cycles. Adjacent layers are linked by Ag-N bonds and Keggin anions to form the 3D structure of 3. The influence of types of POM anions and organic ligands on the final structures were discussed. Furthermore, the electrochemical, photocatalytic and fluorescent properties of compounds 1–3 were investigated.
    No preview · Article · May 2015 · RSC Advances
  • Xiuli Wang · Danna Liu · Na Han · Hongyan Lin · Jian Luan · Aixiang Tian
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    ABSTRACT: Two new polyoxometalate(POM)-based hybrid compounds, [Cu(en)][H4Mo4O16]0.5(1)(en=ethylene-diamine) and [Ag(3-C5H6N2)2][H2PMo12O40](2)(3-C5H6N2=3-aminopyridine), containing different transition metalamine subunits were hydrothermally synthesized and characterized by elemental analyses, infrared spectroscopy and single-crystal X-ray diffraction. For compound 1, each [H4Mo4O16]4−(Mo4O16) cluster was linked to four neighboring Mo4O16 clusters through four [Cu(en)]2+ subunits to yield a (2,4)-connected 2D layer, which was further extended to a 3D supramolecular network via hydrogen bonding interactions. For compound 2, the adjacent [H2PMo12O40]− clusters were bridged by [Ag(3-C5H6N2)2]+ subunits to generate a 1D chain. The electrochemical behaviors and the photocatalytic activities of compounds 1 and 2 were studied in detail.
    No preview · Article · May 2015 · Chemical Research in Chinese Universities
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    ABSTRACT: Through utilizing two kinds of pendent organic ligands, four new Keggin-based compounds, [AgI3(bpz)2(pz)(H2O)(H3PMo12O40)2] (1), [AgI2(bpz)2(H3PMo12O40)]•2H2O (2), [AgI3(btz)4(PMo12O40)] (3) and [AgI3(btz)3(PMo12O40)]·H2O (4) (bpz = 4-butyl-1H-pyrazole, pz = pyrazole, btz = 1-benzyl-1H-(1,2,4)triazole), were synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction. Compounds 1 and 2 were obtained in one-pot reaction, as well as compounds 3 and 4. In compound 1, six AgI ions are fused by four bpz and two pz molecules to form a hexa-nuclear cycle, with two coordinated water embedding through Ag3-O1W bonds. The three-connected POM1 anions connect these cycles alternately to construct 1D chains, which are further linked by four-connected POM2 anions to build a 3D framework of 1. Compound 2 contains 1D AgI chains, linked by four-connected POM1 and two-connected POM2 respectively to construct a 3D structure. The pz ligand was not observed in 2. In compound 3, there exist [AgI3(btz)4]3+ subunits, which are alternately connected by PMo12 anions to form a 1D chain. In compound 4, there exists a zigzag Ag-btz chain. Adjacent chains are further linked by Ag3-C8 bonds and a 2D metal-organic layer is constructed. The PMo12 anions link adjacent layers to build a 3D framework of 4. The syntheses of compounds 1 and 2, 3 and 4 prove that the one-pot method under hydrothermal conditions is efficient for pursuing two even more kinds of crystals.
    No preview · Article · Apr 2015 · Dalton Transactions

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Institutions

  • 2007-2015
    • Bohai University
      Chinchow, Liaoning, China
  • 2014
    • Dalian Institute of Chemical Physics
      Lü-ta-shih, Liaoning, China
    • Dalian Medical University
      Lü-ta-shih, Liaoning, China
  • 2005-2013
    • Chinese Academy of Sciences
      • • Dalian Institute of Chemical Physics
      • • State Key Laboratory of High Performance Ceramics and Superfine Microstructures
      Peping, Beijing, China
  • 2001-2013
    • Northeast Normal University
      • • The Institute of Genetics and Cytology
      • • Institute of Polyoxometalate Chemistry
      • • Department of Chemistry
      Hsin-ching, Jilin Sheng, China
  • 2010
    • Tufts University
      Бостон, Georgia, United States