Xiuli Wang

Bohai University, Chinchow, Liaoning, China

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Publications (57)123.44 Total impact

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    ABSTRACT: Two novel Anderson-type polyoxometalates (POMs)-based metal-organic frameworks (MOFs), namely, H{Cu2(μ2-OH)2L(1)[CrMo6(OH)6O18]}·4H2O (), {Cu2L(2)[CrMo(VI)5Mo(V)(OH)6O18](H2O)4}·4H2O () (L(1) = N,N'-bis(3-pyridinecarboxamide)-piperazine, L(2) = N,N'-bis(4-pyridinecarboxamide)-piperazine), are hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). In complex , the hexadentate [CrMo6(OH)6O18](3-) polyoxoanion bridges the Cu(II) ions to generate a 2D Cu-POM inorganic layer, which is further extended by the μ2-bridging L(1) ligands (via ligation of pyridyl nitrogen atoms) to form a 3D MOF with a 4,6-connected {4(4)·6(10)·8}{4(4)·6(2)} topology. Complex is also a 3D POM-based MOF exhibiting a {4(2)·8(4)} topology, which is constructed from the quadridentate [CrMo(VI)5Mo(V)(OH)6O18](4-) polyoxoanions and μ4-bridging L(2) ligands (via ligation of pyridyl nitrogen and carbonyl oxygen atoms). The different coordination modes of POM polyanions and the isomeric bis(pyridylformyl)piperazine ligands play key roles in the construction of the title complexes. In addition, the photocatalytic activities of the title complexes on the degradation of methylene blue (MB) under UV, visible light and sunlight irradiation have been investigated in detail.
    Dalton Transactions 06/2014; · 3.81 Impact Factor
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    ABSTRACT: Three silver-bis(triazole) three-dimensional (3D) metal-organic frameworks (MOFs) with Wells-Dawson type polyoxometalates (POMs) as high-connected inorganic ligands have been isolated: [Ag7(bte)4(H2O)(HP2W(VI)16W(V)2O62)]·2H2O (), [Ag7(btp)5(HP2W(VI)16W(V)2O62)]·H2O () and [Ag4(btb)3.5(P2W18O62)](H2btb)·2H2O () (bte = 1,2-bis(1,2,4-triazol-1-yl)ethane, btp = 1,3-bis(1,2,4-triazol-1-y1)propane, btb = 1,4-bis(1,2,4-triazol-1-y1)butane). Compound contains a 3D metal-organic subunit, which is constructed from 1D Ag/bte chains and 2D layers based on hexanuclear [Ag6(bte)2](6+) circuits. The [P2W18O62](8-) (P2W18) anions act as 10-dentate inorganic ligands incorporated into the channels of the 3D framework. In compound , the metal-organic subunits are a 2D layer constructed from the [Ag5(btp)2](5+) circuits and flexible Ag/btp helical chains. The P2W18 anions also act as 10-dentate inorganic ligands linking adjacent 2D layers to construct a 3D framework. Both and contain Ag-Ag bonds, which further stabilize the structures. Compared with and , the metal-organic subunit of is a 3D cage-like host architecture. Without the assistance of Ag-Ag bonds, two sets of these 3D MOFs interpenetrate each other to generate a 2-fold interpenetrating structure for stability, which are united by the 5-dentate P2W18 anions to construct an integrated 3D structure. The roles of coordination modes of silver centers and POMs, as well as the effects of organic ligand lengths on the metal-organic subunit and final structures, have been reported. In addition, the electrochemical properties, photochemical catalysis and antibacterial properties of title compounds have also been investigated.
    Dalton Transactions 02/2014; · 3.81 Impact Factor
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    ABSTRACT: The new isostructural compounds (IIIa, b) crystallize in the triclinic space group P with Z = 1 (single crystal XRD).
    ChemInform 01/2014; 45(3).
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    ABSTRACT: A new Keggin-type polyoxometalate (POM)-based compound, [Ag9(ptz)5][PMoVI11MoVO40]·H2O (1) (ptzH = 5-phenyl-1H-tetrazole), was synthesized under hydrothermal conditions. Compound 1 exhibits a 2D layer containing AgI ribbons and hexa-nuclear AgI circles, which are further linked by AgI atoms and [PMoVI11MoVO40]4 − anions to construct a 3D framework. The electrochemical properties of compound 1 have been investigated.
    Inorganic Chemistry Communications 01/2014; 40:51–54. · 2.02 Impact Factor
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    ABSTRACT: A novel 3D metal-organic framework (MOF), [Cu4IICu2I(pzca)6(HPCuMo11O39)(H2O)6]•2H2O (1) (pzca = 2-pyrazinecarboxylicacid) was obtained, which represents the first compound constructed by the monosubstituted Keggin chains and metal–carboxylate chains. The electrochemical and photocatalytic properties also have been investigated.
    Inorganic Chemistry Communications 01/2014; 42:10–14. · 2.02 Impact Factor
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    ABSTRACT: Three new inorganic–organic hybrid supramolecular architectures constructed from polyoxometalates (POMs) and flexible bis-pyridyl-bis-amide with different spacer lengths have been hydrothermally synthesized. Compounds 1–3 show (5,5)-, (4,8)- and (4,5)-connected 3D supramolecular frameworks, respectively. Compounds 1–3 represent the first examples of POM-based supramolecular hybrids derived from the flexible bis-pyridyl-bis-amide molecules and show good electrocatalysis activity.
    Inorganica Chimica Acta. 01/2014; 421:342–348.
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    ABSTRACT: A 3-fold interpenetrating 3D framework with a 4-connected CdSO4-like topology was obtained, which represents the first example of coordination polymers with the semi-rigid naphthalene-based bis-pyridyl-bis-amide ligand and shows excellent photocatalytic activity and selectivity for the decomposition of RhB.
    Inorganic Chemistry Communications 01/2014; · 2.02 Impact Factor
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    ABSTRACT: Three octamolybdate-based metal-organic complexes (MOCs), namely, [H2en]2[Cu(pzca)2(Mo8O26)]·4H2O (), [Cu2(pzca)2(Mo8O26)0.5(H2O)4]·H2O () and [Cu(I)3Cu(II)4(pzca)7(Mo8O26)(H2O)2]·4H2O () (en = ethylenediamine, pzca = 2-pyrazinecarboxylic acid), have been successfully synthesized under hydrothermal conditions via adding different kinds of amine and adjusting the pH values. The single crystal X-ray diffraction, elemental analyses, IR spectra, and thermogravimetric analyses have been used to characterize the title complexes. In compound , the [Cu(pzca)2] units bridge the [β-Mo8O26](4-) clusters to generate a 1D chain, which is extended by hydrogen-bonding interactions to a 3D supramolecular structure. Compound exhibits a 3D coordination framework based on the 1D infinite [Cu2(pzca)2]n(2n+) zigzag chains and β-Mo8O26(4-) anions, and shows a trinodal 3,3,4-connected {8(3)}4{8(6)} topology containing a dodecagonal channel with the dimension of 13.496 × 19.642 Å(2). Compound is a 3D metal-organic network derived from the "λ"-like [Cu5(pzca)4] subunits and [β-Mo8O26](4-) anions, which represents a novel {4·6·8(3)·10}2{4·6·8}2{4(2)·10(4)}{4(2)·8(3)·10}{6·8(2)}2{6(2)·10(3)·12}{6(2)·8(2)·10(2)}{6(2)·8(3)·10}{6(3)}4 topology in octamolybdate-based MOCs. The structural diversities show that the different amines and pH value of the reaction system play key roles in the construction of high dimensional architectures. Moreover, the electrochemical behaviors and photocatalytic activity for compound have been investigated in detail.
    Dalton Transactions 11/2013; · 3.81 Impact Factor
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    ABSTRACT: Two new polyoxometalate (POM)-based metal-organic frameworks (MOFs) constructed from multinuclear silver-ptz cycle/belts, namely [Ag7(ptz)4(NO3)(H2O)][H4P2W18O62]·5H2O () and [Ag6(ptz)4(H2O)2][HPMo12O40]·3H2O () (ptzH = 5-(3-pyridyl)-1H-tetrazole), have been successfully synthesized under hydrothermal conditions via changing the polyoxoanions and adjusting the pH. Compound exhibits a 3D framework constructed from the Wells-Dawson [P2W18O62](6-) anion and a 2D layer based on two types of multinuclear Ag-ptz cycles. In compound , the 1D infinite multinuclear Ag-ptz belts consisting of repeated tetranuclear subunits [(Ag1)2(Ag2)2(ptz)4] are connected by Ag3 ions to form a 2D layer. The adjacent 2D layers are further linked by tetra-dentate Keggin [PMo12O40](3-) anions to construct a 3D framework. The structural analyses reveal that the different polyoxoanions have a great influence on the Ag(I)-ptz multinuclear cycle/belts and the whole structures. The influences of the pH and molar ratio of initial reactants in the hydrothermal process were also discussed. The electrochemical and photocatalytic properties of the title compounds have been studied in detail.
    Dalton Transactions 08/2013; · 3.81 Impact Factor
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    ABSTRACT: Four Ag(I) ions are linked by four 5-phenyl-1H-tetrazole (Hptz) units to form a molecular crown [Ag4(ptz)4] as a structural analogue of calix[4]arene, which are further supported by Keggin anions to build a 2D layer containing two kinds of cycles, [Ag8(ptz)4(HPW(V)2W(VI)10O40)]·2H2O ().
    Dalton Transactions 05/2013; · 3.81 Impact Factor
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    ABSTRACT: The hydrothermal reaction of CoCl2 with N,N’-bis(pyridine-3-yl)pyridine-3,5-dicarboxamide (L) and 1,3,5-benzenetricarboxylic acid (H3BTC) mixed ligands affords two novel polynuclear cobalt cluster-based metal-organic frameworks (MOFs), [Co3(L)2(BTC)2(H2O)2]•6H2O (1) and {[Co2(L)(BTC)(OH)]•2.5H2O}2 (2). Single crystal X-ray diffraction analysis reveals that the CoII ions in complex 1 are connected by BTC anions with four-coordinated mode to form a two dimensional (2D) undulating layer based on dinuclear [Co2(COO)4] units, which is extended into a 3D (3, 4, 4, 5)-connected MOF by the L ligand with μ3-bridging coordination mode. In complex 2, the BTC ligand displays a six-coordinated mode to connect CoII ions into a 2D corrugated layer derived from tetranuclear [Co4(µ3-OH)2(COO)6] motifs, and the layers are further extended into a 3D (3, 8)-connected tfz-d MOF via μ2- bridging L ligand. The title complexes exihibit a (42•63•85)2(42•63•8)2(6•82)2(62•84) topology for 1 and a (43)2(46•618•84) topology for 2, respectively. The pH value, as well as the various coordination modes of the tri-pyridyl-bis-amide L and BTC ligands, play a crucial role in the construction of the diverse topological structures of 1 and 2. Complex 1 exhibits excellent photocatalytic activity for the dye degradation under UV light. In addition, the electrochemical behaviours, magnetic and fluorescent properties of the two complexes have also been investigated.
    RSC Advances 05/2013; · 3.71 Impact Factor
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    ABSTRACT: Four [PW12O40]3− (PW12)-based inorganic–organic hybrid compounds constructed from AgI ions and flexible bis(triazole) ligands with different spacer lengths, [Ag8(btp)4(H2O)2(HPWVI10WV2O40)2]·H2O (1), [Ag4(btb)2(HPWVI10WV2O40)] (2), [(btb)(H3PW12O40)]·6H2O (3) and [Ag5(btx)4(PWVI10WV2O40)] (4), (btp = 1,3-bis(1,2,4-triazol-1-yl)propane, btb = 1,4-bis(1,2,4-triazol-1-yl)butane, btx = 1,6-bis(1,2,4-triazol-1-yl)hexane), have been successfully isolated in the pH range 0.5–2.0 under hydrothermal conditions and characterized by single crystal X-ray diffraction analysis. In compound 1, the btp with a shorter spacer –(CH2)3– was used, and the 2D AgI–btp wave layers containing tetra-nuclear loops have been obtained, which were further extended into a 3D hamburger-style framework by two types of PW12 inorganic linkages. In compound 2, the btp ligand was replaced by btb with a longer spacer –(CH2)4–, thus a 2D AgI–btb grid layer containing two types of multinuclear loops was obtained. The PW12 anions reside in the void of a large hexa-nuclear loop and as octa-dentate inorganic linkages connect these 2D grid layers to construct a 3D framework. Compound 3 was synthesized under the same conditions as 2 except for a different crystallization time, which only exhibits a supramolecular structure constructed from protonated PW12 and btb molecules. The btx molecule with the longest –(CH2)6– spacer was utilized in compound 4, an interesting 3-fold interpenetrating 2D AgI–btx network containing large dodeca-nuclear loops formed, which was further linked by the six-connected PW12 anions to construct a 3D skeleton. The influences of –(CH2)n– spacers as well as the pH value and crystallization time on forming and tuning different 3D AgI/POM-based compounds containing different multinuclear loops have been discussed. Moreover, the electrochemical properties and photochemical catalysis of these four compounds have also been investigated.
    CrystEngComm 05/2013; 15(22):4516-4526. · 3.88 Impact Factor
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    ABSTRACT: Four coordination polymers based on two bis-pyridyl-bis-amide ligands and three aromatic dicarboxylates with different substituent groups, namely, [Co(3-bpcb)1.5(NPH)(H2O)]·4H2O (1), [Co(3-bpcb)(NIPH)] (2), [Co(3-bpcb)0.5(5-H2AIP)]·2H2O (3), [Co(3-bpcd)0.5(5-H2AIP)(H2O)]·2H2O (4) [3-bpcb = N,N′-bis(3-pyridinecarboxamide)-1,4-benzene, 3-bpcd = N,N′-bis(3 pyridine)cyclohexane-1,4-dicarboxamide, H2NPH = 3-nitrophthalic acid, H2NIPH = 5-nitroisophthalic acid, 5-H4AIP = 5-aminoisophthalic acid] have been synthetized under hydrothermal conditions. Complex 1 displays a one dimensional (1D) chain based on the binuclear [Co2(NPH)2] units and 3-bpcb ligands, which is extended into a three dimensional (3D) supramolecular framework through hydrogen bonding and π-π stacking interactions. In complex 2, the (3,5)-connected two dimensional (2D) layers are constructed from 1D Co-NIPH chains and bidentate-bridging 3-bpcb ligands. Complex 3 is a 2D double layer based on Co-5-H2AIP 2D layers and 3-bpcb pillars. Complex 4 also displays a 2D network, which is constructed from the Co-5-H2AIP 1D double chains and 3-bpcd ligands. Finally, complexes 2-4 are extended into 3D supramolecular frameworks by hydrogen bonding or π-π stacking interactions. The substituent groups of dicarboxylates play an important role in the assembly and structures of the title complexes. In addition, the fluorescent properties of complexes 1–4 and the electrochemical behaviors of 3 and 4 at room temperature have been investigated.
    Science China-Chemistry 05/2013; 56(5). · 1.33 Impact Factor
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    ABSTRACT: A series of multifunctional Cu(ii) metal-organic coordination polymers based on three flexible bis-pyridyl-bis-amide ligands and four aromatic dicarboxylates, namely [Cu(3-dpye)(3-NPA)(H2O)]·3H2O (), [Cu(3-dpye)0.5(5-AIP)(H2O)] (), [Cu(3-dpye)(1,3-BDC)]·3H2O (), [Cu3(3-dpye)(1,2-BDC)2(μ2-OH)2] (), [Cu3(3-dpyb)(1,2-BDC)2(μ2-OH)2] (), [Cu(3-dpyh)0.5(1,2-BDC)]·H2O (), [Cu(3-dpyh)0.5(5-AIP)(H2O)] () [3-dpye = N,N'-bis(3-pyridinecarboxamide)-1,2-ethane, 3-dpyb = N,N'-bis(3-pyridinecarboxamide)-1,4-butane, 3-dpyh = N,N'-bis(3-pyridinecarboxamide)-1,6-hexane, 3-H2NPA = 3-nitrophthalic acid, 5-H2AIP = 5-aminoisophthalic acid, 1,3-H2BDC = 1,3-benzenedicarboxylic acid, 1,2-H2BDC = 1,2-benzenedicarboxylic acid], have been hydrothermally synthesized and structurally characterized by elemental analyses, IR, PXRD, TG and single crystal X-ray diffraction. X-ray analyses reveal that the seven Cu(ii) complexes show three kinds of different 2D layer structures (for complexes , , , and ) and a 3D coordination framework (for complexes and ), exhibiting the (4(4)·6(2)) topology for , (4(2)·6(3)·8)(4(2)·6) topology for isostructural complexes and , (4(2)·6(7)·8)(4(2)·6) topology for complex , (3·4·5)2(3·4(2)·5·8(6))2(3(2)·8·9(2)·10)(4(2)·8(2)·10(2)) topology for isostructural complexes and , and the (4(2)·6(3)·8)(4(2)·6) topology for complex , respectively. In complexes , the bis-pyridyl-bis-amide ligands adopt a μ2-bridging mode in , , , and (via ligation of two pyridyl nitrogen atoms) and a μ4-bridging coordination mode in and (via ligation of two pyridyl nitrogen atoms and two carbonyl oxygen atoms), which play an important role in determining the dimensionality of the title complexes. The aromatic dicarboxylates serve as a linker (for ) and three-connected nodes (for ) to bridge the adjacent Cu(ii) ions, respectively, leading to the formation of various topological structures, which indicate both the substitute group and position of carboxyl group of the dicarboxylates play significant roles in the construction of the title complexes. The fluorescent, electrochemical and photocatalytic properties of complexes have also been investigated.
    Dalton Transactions 04/2013; · 3.81 Impact Factor
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    ABSTRACT: Two octamolybdate hybrid complexes based on flexible bis-pyridyl-bis-amide ligands with different spacer lengths, namely, {[Cu(L1)(β-Mo8O26)0.5(H2O)2]·H2O}n (1), [Cu(L2)(β-Mo8O26)0.5(H2O)] (2) (L1 = N,N′-bis(3-pyridinecarboxamide)-1,2-ethane, L2 = N,N′-bis(3-pyridinecarboxamide)-1,6-hexane), have been successfully synthesized. Crystal structure analysis reveals that 1 is a two-dimensional (2D) network constructed from [Cu-L1]n2n+ chains and [β-Mo8O26]n4n− anions, displaying a 4-connected framework with 32·62·72 topology. Compound 2 consists of double one-dimensional (1D) meso-helical chains and 1D inorganic chains to generate a three-dimensional (3D) framework with a (4,4)-connected (4·64·8)2(42·62·82) topology. The title compounds represent the first examples of introducing a flexible bis-pyridyl-bis-amide ligand into the isopolymolybdates system. In addition, the electrochemical behavior of 1, luminescent properties and photocatalytic activities of the title compounds have been investigated.
    RSC Advances 02/2013; 3(11):3592-3598. · 3.71 Impact Factor
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    ABSTRACT: Four new d10 metal–organic coordination polymers tuned by the “V”-shaped tri-pyridyl–bis-amide ligands with different spacers, namely, [Zn(L1)(BDC)]·H2O (1), [Cd(L1)(BDC)]·H2O (2), [Zn(L2)(BDC)] (3) and [Cd(L2)(BDC)] (4) (L1 = N,N′-bis(pyridine-3-yl)pyridine-2,6-dicarboxamide, L2 = N,N′-bis(pyridine-3-yl)pyridine-3,5-dicarboxamide, H2BDC = 1,4-benzenedicarboxylic acid) have been synthesized under hydrothermal conditions. In complexes 1 and 2, the metal ions are linked by L1 to form left- and right-helical Zn/Cd–L1 chains, which are further extended into two-dimensional (2D) wave-like layers by BDC anions. In 3, two L2 ligands link two ZnII ions forming the Zn2(L2)2 loops, which are connected by BDC anions to form a (2·65) topological 2D network. In addition, the large Zn2(L2)2 loops are threaded by the BDC rods from above and below 2D layers so as to form 2D → 3D polyrotaxane and polycatenane structures. In 4, the CdII ions are linked by L2 ligands to generate 1D double chain ribbons with Cd2(L2)2 loops, which are further connected by the BDC linkers to form a 3D framework. Two identical 3D frameworks interpenetrate each other in a twofold mode, giving rise to a polyrotaxane and polycatenane array, which is relative limited. The diverse structures of complexes 1–4 demonstrate that the tri-pyridyl–bis-amide ligands and the central metals have significant effect on the final structures. The thermal stability and fluorescent properties of complexes 1–4 have been investigated. In addition, the title complexes exhibit photocatalytic activity for dye methylene blue degradation under UV light.
    CrystEngComm 02/2013; 15(10):1960-1969. · 3.88 Impact Factor
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    ABSTRACT: A Keggin-type polyoxometalate (POM)-based complex, [Ag5(L)3(H2O)2]·6H2O (1) (L = N,N′-bis(3-pyridinecarboxamide)-1,2-ethane), has been hydrothermally synthesized. Compound 1 shows a 3D + 3D interpenetrating network with a (3,4,4,4)-connected (4 × 62)2(42 × 62 × 82)(65 × 8)2 topology, and it represents the first example of interpenetrating POM-based complex based on flexible bis-pyridyl-bis-amide ligands. Moreover, the electrochemical behavior and luminescence of 1 have been investigated.
    Journal of Coordination Chemistry 01/2013; 66(8). · 1.80 Impact Factor
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    ABSTRACT: Three copper(II) isomers, [Cu(dtcd)(DNBA)2]n (1–3) (HDNBA = 3,5-dinitrobenzoic acid, dtcd = N,N-di(4H-1,2,4-triazole)cyclohexane-1,4-dicarboxamide), were synthesized in a one-pot reaction, and structurally characterized. Polymer 1 shows a 1-D single chain in which dtcd connect adjacent Cu2+ ions, while DNBA− is monodentate. In 2, every two Cu2+ ions are linked by carboxylate of a DNBA− in a chelate-bridging mode into a binuclear unit, which is further connected by dtcd ligands into a 1-D double chain. In 3, dtcd connect Cu2+ ions via triazole nitrogens to generate 1-D single chains, which are further extended into a 2-D network by the amide oxygens of a dtcb from an adjacent chain. The pH plays an important role in product distribution of 1–3. The coordination behaviors of dtcd and DNBA− also influence the final structures. Luminescent properties of 1–3 have been investigated.
    Journal of Coordination Chemistry 01/2013; 66(20). · 1.80 Impact Factor
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    ABSTRACT: Two metal–organic coordination polymers, [Cu3(4-bpcb)2(1,2,4-btc)2(H2O)2] (1) and [Cu3(3-bpcb)3(btec)1.5] (2), have been synthesized from hydrothermal reaction of copper chloride with mixed ligands [4-bpcb = N,N′-bis(4-pyridinecarboxamide)-1,4-benzene, 3-bpcb = N,N′-bis(3-pyridinecarboxamide)-1,4-benzene, 1,2,4-H3btc = 1,2,4-benzenetricarboxylic acid, and H4btec = 1,2,4,5-benzenetetracarboxylic acid]. X-ray diffraction analysis reveals that 1 exhibits a 2-D layer structure and 2 possesses a three-dimensional (3-D) network. In 1 and 2, CuII ions are connected by bridging 1,2,4-btc or btec to form 2-D polymeric layers. Cu-1,2,4-btc layer does not propagate into a 3-D coordination framework in 1 due to 4-bpcb showing monodentate coordination (via ligation of only one pyridyl nitrogen). In 2, Cu-btec 2-D layers are further extended into a 3-D network with (64.82)3 topology by 3-bpcb ligand in μ 2-bridging coordination (via ligation of two pyridyl nitrogens). The different structures of the two complexes illustrate the influence of different polycarboxylates and N-donor positions of organic ligands on the formation of such coordination architectures. Moreover, the thermal properties and electrochemical properties of the copper complexes bulk-modified carbon paste electrodes have been studied.
    Journal of Coordination Chemistry 01/2013; 66(4). · 1.80 Impact Factor
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    ABSTRACT: Two new 3D coordination complexes [Cd(3-bpcd)(pht)] (1) and [Zn(3-bpcd)(pht)] (2) [3-bpcd = N,N'-bis(pyridin-3-yl)cyclohexane-1,4-dicarboxamide, = phthalic acid] have been hydrothermally synthesized. X-ray diffraction analysis reveals that the complexes 1 and 2 represent a 4-connected diamondoid topology with a 3-fold interpenetrating feature. Moreover, the fluorescent properties of complexes 1 and 2 are studied.
    Bulletin- Korean Chemical Society 01/2013; 34(7). · 0.84 Impact Factor