Yao-Yu Wang

Northwest University, Florida, United States

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Publications (156)391.46 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Two new Co(II) based metal–organic frameworks, namely {[Co5(μ3-OH)2(m-pda)3(bix)4]·2ClO4}n (1) and {[Co2(p-pda)2(bix)2(H2O)]·H2O}n (2), were prepared by hydrothermal reactions of Co(II) salt with two isomeric dicarboxyl tectons 1,3-phenylenediacetic acid (m-pda) and 1,4-phenylenediacetic acid (p-pda), along with 1,3-bis(imidazol-L-ylmethyl)benzene (bix). Both complexes 1 and 2 have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). 1 shows a 6-connected 3-D pcu cationic framework with pentanuclear [Co5(μ3-OH)2(COO)6(bix)2]2+ units, while 2 exhibits a 6-connected 3-D msw net based on [Co2(μ2-H2O)(COO)2]2+ clusters. The results indicate that the different dispositions of the carboxylic groups of dicarboxylates have an important effect on the overall coordination frameworks. Perchlorate anions in 1 can be partly exchanged by thiocyanate and azide anions, however they are unavailable to nitrate anions. Magnetic susceptibility measurements indicate that both 1 and 2 show weak antiferromagnetic interactions between the adjacent Co(II) ions.
    Dalton Transactions 09/2014; · 3.81 Impact Factor
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    ABSTRACT: Two new Co(ii) based metal-organic frameworks, namely {[Co5(μ3-OH)2(m-pda)3(bix)4]·2ClO4}n () and {[Co2(p-pda)2(bix)2(H2O)]·H2O}n (), were prepared by hydrothermal reactions of Co(ii) salt with two isomeric dicarboxyl tectons 1,3-phenylenediacetic acid (m-pda) and 1,4-phenylenediacetic acid (p-pda), along with 1,3-bis(imidazol-l-ylmethyl)benzene (bix). Both complexes and have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). shows a 6-connected 3-D pcu cationic framework with pentanuclear [Co5(μ3-OH)2(COO)6(bix)2](2+) units, while exhibits a 6-connected 3-D msw net based on [Co2(μ2-H2O)(COO)2](2+) clusters. The results indicate that the different dispositions of the carboxylic groups of dicarboxylates have an important effect on the overall coordination frameworks. Perchlorate anions in can be partly exchanged by thiocyanate and azide anions, however they are unavailable to nitrate anions. Magnetic susceptibility measurements indicate that both and show weak antiferromagnetic interactions between the adjacent Co(ii) ions.
    Dalton transactions (Cambridge, England : 2003). 09/2014;
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    ABSTRACT: Five new solvent-induced cadmium coordination architectures, {[Cd(bib)(5-Br-H2ip)]•EtOH}n (1), {[Cd0.5(bib)0.5(5-Br-H2ip)0.5]•3H2O}n (2), {[Cd2(bib)(5-Br-H2ip)2(MeOH)]}n (3), {[Cd(bib)0.5(5-Br-H2ip)(H2O)2]•H2O}n (4), and {[Cd(bib)0.5(5-Br-H2ip)(H2O)]}n (5), have been constructed from the same materials 1,4-bis(2-methyl-imidazol-1-yl)butane (bib), 5-bromoisophthalic acid (5-Br-H2ip) and Cd(Ac)2•2H2O under different reaction solvents. As controlled by solvent systems, compound 1 shows a 3-fold interpenetrating 3D framework based on the left- and right-handed helical chains, while compound 2 reveals a 3-fold interpenetrating 3D network and each single net is based on the left-, right-handed and meso-helical chains. Compound 3 is a 3D framework that can be simplified as a 6-connected net with the topological type of (48•62). 4 and 5 both display 3D supramolecular frameworks through the weak aromatic π-π stacking interactions and hydrogen bonding interactions. However, the topologies of 4 and 5 are definitely different. Compound 4 presents a 3-connected net with the (82•10) topology, while compound 5 reveals a 4-connected net with the (42•63•8) topology. The effects of solvents on the crystal structures have been discussed and the thermogravimetric analysis and solid state photoluminescence for 1-5 were also investigated.
    CrystEngComm 08/2014; · 3.88 Impact Factor
  • Bo Liu, Wei-Ping Wu, Lei Hou, Yao-Yu Wang
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    ABSTRACT: Four uncommon isostructural nanocage-based 3D Ln-MOFs, (Ln = Eu, Tb, Gd and Dy), were constructed using a new diisophthalate ligand with active pyridyl sites. exhibits highly efficient luminescent sensing for Cu(2+) ions and selective CO2 capture.
    Chemical communications (Cambridge, England). 06/2014;
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    ABSTRACT: Four new coordination polymers (CPs), [Co3(L)2(bib)3(EtOH)2]·2H2O (), [Mn3(L)2(bib)2(H2O)4]·4H2O (), [Ni(HL)(bib)(H2O)3] () and [Ni3(bib)4(H2O)10]·2(L)·12(H2O) (), were synthesized under solvothermal conditions with an unsymmetrical tricarboxylic acid ligand [biphenyl-3,3',5-tricarboxylic acid (H3L)] in the presence of the 1,4-bis(1H-imidazol-4-yl)benzene (bib) ligand. In compound , tricarboxylate acid ligands (H3L) link Co centers to generate two-dimensional (2D) layers which are further connected by bib ligands to exhibit a three-dimensional (3D) framework with a (4,4,5)-connected (4(2)·6(3)·8)2(4(2)·6(7)·8)2(6(4)·8·10) topology. The three-dimensional (3D) framework of is defined as a (3,3,4)-connected topology with the point symbol of (6·8(2))2(6(2)·8)2(8·10(4)·12). Compound contains a one-dimensional (1D) left-hand helix chain along the a direction and further extends into a 2D supramolecular network and a 3D supramolecular framework via hydrogen bonds. Compound displays a one-dimensional (1D) molecular ladder, which is further combined with each other through ππ stacking to extend into 2D supramolecular sheets. The supramolecular networks of and resulted from the different solvent ratios [V(H2O)-V(EtOH)] in the reaction. All the CPs are characterized by single-crystal X-ray diffraction analyses, powder X-ray diffraction (PXRD), elemental analyses, IR spectroscopy, and TGA analyses. Moreover, the weak ferromagnetic properties of and and antiferromagnetic properties of and have also been investigated.
    Dalton transactions (Cambridge, England : 2003). 06/2014;
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    ABSTRACT: A rarely reported L1D (left-handed helical 1D chain) + R1D (right-handed helical 1D chain) → 3D polycatenated network, [Cd(H2ttac)bpp]n (1), constructed from the vertical interpenetration of triple-stranded homochiral helices, has been synthesized under hydrothermal condition by H4ttac (1,1′,2′,1″-terphenyl-4,4′,4″,5′-tetracarboxylic acid), 1,3-bis(4-pyridyl)propane (bpp), and Cd(NO3)2·4H2O. The luminescent properties of 1 and the ones immersed in various kinds of organic compounds and nitrate@DMF solutions have been investigated. Importantly, 1 shows highly sensitive response to nitro aromatic compounds and Cu2+ through luminescence quenching effects, making it a promising luminescent sensor for nitro aromatic compounds and Cu2+. Besides, experiments upon deprotonation by NaOH, KOH, methylamine, and triethylamine are conducted, respectively. As base increases, the luminescence spectra exhibit gradual blue shifts. The mechanisms of the sensing properties have been studied in detail.
    Crystal Growth & Design 05/2014; 14(6):2954–2961. · 4.69 Impact Factor
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    ABSTRACT: A tetrakis(bisurea)-decorated tetraphenylethene (TPE) ligand (L(2) ) was designed, which, upon coordination with phosphate ions, displays fluorescence "turn-on" over a wide concentration range, from dilute to concentrated solutions and to the solid state. The fluorescence enhancement can be attributed to the restriction of the intramolecular rotation of TPE by anion coordination. The crystal structure of the A4 L2 (A=anion) complex of L(2) with monohydrogen phosphate provides direct evidence for the coordination mode of the anion. This "anion-coordination-induced emission" (ACIE) is another approach for fluorescence turn-on in addition to aggregation-induced emission (AIE).
    Angewandte Chemie International Edition in English 05/2014; · 13.45 Impact Factor
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    ABSTRACT: Two isomeric metal–organic frameworks, consisting of Co-triazolate layers and positional isomeric dicarboxylate pillars, both show distinct temperature-dependent CO2 sorption behaviors. Because of the pores functionalized by amino groups, both materials have high CO2 uptake and highly selective sorption of CO2 over CH4 and N2.
    Crystal Growth & Design 03/2014; 14(4):2003–2008. · 4.69 Impact Factor
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    ABSTRACT: By reacting an asymmetry semi-rigid Y-shaped/L-shaped linker H3cpta (H3cpta = 3-(4'-carboxyphenoxy)phthalic acid) and Co(CH3COO)2·6H2O under different N-donor ligands in different solvents, three new Co-based coordination polymers, [Co3(cpta)2(bpe)3(H2O)4] () [Co(μ2-H2O)(μ3-OH)(Hcpta)(bpe)(H2O)·3(DMF)3(H2O)] () and [Co3(cpta)2(bpa)4] () have been obtained. They exhibit trinodal topological nets/layer, based on Co(2+) ions and Y-shaped/L-shaped carboxylate linkers. and present 3D frameworks with the point symbol {4·10(2)}2{10(5)·12}{4·8(5)}2 for and {4·8(2)}2{8(5)·9}{4·6(7)·9(2)}2 for . While, exhibits a 2D layer with the point symbol {4·6·8}{4·6(2)·8(3)}{6(2)·8}. The magnetic studies indicate that all of the three complexes show antiferromagnetic exchanges transmitted through μ3-carboxylate/μ4-carboxylate bridges, μ2-H2O molecules and μ3-OH ions between Co(2+) ions, respectively. And the result of this research shows that the solvent and the secondary ligands could co-regulate coordination polymer with interesting properties, providing a constructive guidance when synthesizing versatile topologies with the same organic spacer but a different architecture.
    Dalton Transactions 02/2014; · 3.81 Impact Factor
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    ABSTRACT: Eleven new multidimensional transition coordination polymers, [Cd2(dcpy)2(H2O)] (1), [Cd(dcpy)]·H2O (2), [Cd(dcpy)(H2O)1.5]·2H2O (3), [Cd(dcpy)(bipy)0.5(H2O)]·5H2O (4), [Cd2(dcpy)2(bipy)(H2O)3]·2.5H2O (5), [Cd2(dcpy)2(bipy)]·4H2O (6), [Cd(dcpy)(bpa)0.5]·2H2O (7), [Ni(dcpy)(H2O)2] (8), [Ni(dcpy)(bpe)0.5(H2O)]·3H2O (9), [Ni(dcpy)(bpe)0.5(H2O)]·0.5H2O (10), and [Ni(dcpy)(bpa)0.5(H2O)2]·H2O (11), have been synthesized by using a tritopic ligand 3-(2′,5′-dicarboxylphenyl)pyridine acid (H2dcpy) and three different N-donor ancillary ligands (bipy = 4,4′-bipyridine, bpe = 1,2-bi(4-pyridyl)ethene, and bpa = 1,2-bi(4-pyridyl)ethane) in different solvents and temperatures. 1 is a four-connected three-dimensional (3D) framework based on two kinds of Cd–O–Cd and Cd–(COO)–Cd chains. 2 shows also a four-connected 3D framework with one-dimensional (1D) channels formed by double left- and right-handed helical chains. 3 displays a 3D microporous framework composed of Cd2O3 as a secondary building unit (SBU) with a (4,6)-connected net. 4 is a two-dimensional (2D) layer based on Cd2O2 SBU and further stacks to generate a 3D supramolecular framework with open channels. 5 is a rare 3D homochiral microporous framework with left-handed helical chains. 6 presents the first (3,4,6)-connected 3D self-penetrating framework based on 1D metal–organic nanotubes (MONTs). 7 is a (3,4)-connected 3D microporous pillar-layer framework with 1D square channels filled by left- or right-handed helical water clusters chains. 8 is a 2D (3,6)-connected net based on Ni2 dimers. 9 shows a wavelike 2D stacked layer framework possessing two types of open channels. 10 is a structural isomer of 9, showing an intriguing (3,4)-connected self-penetrating network, while 11 exhibits a 2D (3,4)-connected layer. The effects of solvents, temperatures, metal cations, and the lengths and rigidness/flexibility of the dipyridyl ligand on the crystal architectures are discussed. The solid-state photoluminescence for 1–7 and the magnetic properties for 8 were also investigated. Gas adsorption studies for 9 shows a high selective adsorption of CO2 over N2.
    Crystal Growth & Design 02/2014; 14(3):1110–1127. · 4.69 Impact Factor
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    ABSTRACT: A three-dimensional (3D) pillar-layered tetranuclear Co(II)-based SBUs (3,8)-connected coordination polymer [Co2(L)(bipy)(OH)(H2O)]n · nCH3CN (1) via the mixed ligands approach, where H3L is 2-(2',4'-dicarboxylphenoxy)benzoic acid and bipy is 4,4'-bipyridine. Complex 1 shows a (3,8)-connected tfz-d topology based on the asymmetric O-donor ligand. The magnetic measurements indicate the antiferromagnetic interaction within the tetranulcear Co(II) ions.
    Inorganic Chemistry Communications 01/2014; · 2.02 Impact Factor
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    ABSTRACT: A new three-dimensional porous framework [Co2(bpdc)2(H2bpz)]∙2(DMF)·5(H2O) (1) (H2bpdc=4,4′-biphenyldicarboxylic acid, H2bpz=3,3′,5,5′-tetramethyl-4,4′-bipyrazole) has been solvothermally synthesized by employing mixed H2bpdc and H2bpz ligands. 1 is a pillared-layer framework based on a binuclear paddle-wheel Co2(O2C-R)4 cluster, and exhibits a 2-fold interpenetrated 6-connected pcu topology. H2bpz bridges Co2(O2C-R)4 clusters with an angular coordination configuration to form interesting left- and right-handed helical chains. 1 possesses a two-dimensional porous system decorated by uncoordinated pyrazole –NH groups of H2bpz, leading to high adsorption selectivities for CO2 over N2 and H2. In addition, the strong antiferromagnetic interactions between the Co2+ ions in cluster were observed.
    Journal of Solid State Chemistry. 01/2014; 210(1):251–255.
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    ABSTRACT: Three new coordination polymers, [Ag4(H2bpz)4(SO4)2]·H2O (1), [Ag2(H2bpz)2(SO4)]·3H2O (2), and [Ag3(H2bpz)4](SO4)2/3(OH)5/3·4H2O (3) have been solvothermally synthesized with Ag2SO4 and flexible ligand 3,3',5,5'-tetramethyl-4,4'-bipyrazole (H2bpz) in different solvents and temperatures. Complex 1 is a 2-fold interpenetrated three-dimensional (3D) framework with an uncommon (3,5)-connected hms topology. Complex 2 is a structural isomer of 1 and shows a three-connected 2D ths net consisting of interesting 3-fold and 2-fold heterochiral helical chains. Complex 3 discloses a grid layer structure, containing heterochiral helical chains and an unusual meso-helix. More interestingly, three sets of layers in 3 stack in different directions, affording an unprecedented 2D + 2D + 2D → 3D polycatenating cationic framework with 1D + 3D porous systems. In 1-3, H2bpz exhibit exobidentate bridging fashions with wide-ranged interpyrazole tilting angles and changeable coordination configurations, such as cis and trans fashions in 1 and 3 and uniform trans fashion in 2. These lead to the isomeric [Ag(H2bpz)]n arrays of wavelike and helical chains in 1 and 2, respectively. Complexes 1-3 display solid-state photoluminescence stemming from the ligand-centered fluorescent emissions of H2bpz. Because of the highly polar framework, 3 shows excellent adsorption selectivity for CO2 over N2.
    Inorganic Chemistry 12/2013; · 4.59 Impact Factor
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    ABSTRACT: Three new solvent-directed three-dimensional (3D) lead(ii) coordination polymers, [Pb2(L)2]n (), [Pb3(L)3]n () and [Pb(L)]·H2O () [H3L = 2-(pyridine-2-yl)-1H-imidazole-4,5-dicarboxylic acid], have been synthesized solvothermally. As influenced by different solvent systems, compounds and exhibit varying architectures from a multi-nodal 3,3,4,4-connected to a uninodal 3-connected net, while with helices represents a binodal 3,4-connected topological net. Moreover, possesses a micropore which is decorated with pyridyl systems and uncoordinated carboxylate oxygen atoms. In addition, the small-sized and highly polar pores enable to attract CO2 strongly, leading to a high sorption heat for CO2 and significant selectivity for CO2 over H2 and N2 at 293 K. The luminescent behaviors and emissive lifetimes of are also discussed.
    Dalton Transactions 07/2013; · 3.81 Impact Factor
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    ABSTRACT: A new Co-based 3D framework has been constructed from an unprecedented 1D alternate Co5 chain and discrete linear Co3 unit as two distinct secondary building units, which exhibits slow magnetic relaxation behavior.
    CrystEngComm 06/2013; 15(26):5205-5208. · 3.88 Impact Factor
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    ABSTRACT: Under solvothermal conditions, six new Zn(II) coordination polymers, [(CH3)2NH2]2[Zn(L)]·2H2O (1), [Zn2(L)(py)2] (2), [Zn2(L)(bpe)2]·bpe·6H2O (3), [Zn2(L)(bpe)(DMA)(H2O)]·5H2O (4), [Zn2(L)(bpy)0.5(H2O)2]·2.5H2O (5), and [Zn2(L)(bpe)(H2O)]·3H2O (6) [H4L = 5,5′-(p-xylylenediamino)-1,1′,3,3′-(benzenetetra-carboxylic acid), py = pyridine, bpy = 4,4′-dipyridine and bpe = 1,2-bis(4-pyridyl)ethane], have been synthesized by employing a flexible tetracarboxylic acid H4L and different auxiliary pyridine-based ligands. In 1–6, all L4– ligands are 4-connected nodes; however, the diverse configurations of the two terminal isophthalate units of L4– around the central −NHCH2PhCH2NH– spacer lead to various topological nets. 1 shows a three-dimensional (3D) 2-fold interpenetrated 4-connected dia network resulting from the vertical configuration of the two isophthalate units of L4–. 2 displays a 3D (4,4)-connected pts net in which the two isophthalate units of L4– adopt a parallel configuration. The two isophthalate units of L4– in 3 are also almost parallel, resulting in an intriguing 3D 2-fold interpenetrated network with the (4,4)-connected bbf net. 4 is a two-dimensional bilayer structure, extending into a 3D supramolecular framework through interlayer hydrogen-bonding interactions. 5 and 6 disclose similar 3D structural architectures, in which the two isophthalate units of L4– are almost vertical and exhibit tetrahedral topological nodes, inducing a rare (4,5)-connected xww net and an unprecedented (4,6)-connected network, respectively. The thermal stabilities and luminescent properties of 1–6 have also been studied in detail. The complexes exhibit intense solid-state fluorescent emissions at room temperature.
    Crystal Growth & Design 06/2013; 13(7):3177–3187. · 4.69 Impact Factor
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    ABSTRACT: An acylamide-functionalized 3D microporous metal-organic framework built on Zn2 clusters with mixed H3bcta and dipy ligands, which shows unprecedented 2D → 3D polycatenation based on dipy-pillared honeycomb bilayers, and exhibits highly selective CO2 capture.
    Dalton Transactions 05/2013; · 3.81 Impact Factor
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    ABSTRACT: A new porous metal–organic framework based on paddle-wheel Zn2 units and an unsymmetrical pyridyl dicarboxylate, contains a 3D intersecting pore system with uncommon stepwise adsorption and hysteretic desorption behavior for N2, CO2 and H2 gases at low temperature, and shows high selectivity for CO2 over N2 at ambient temperature.
    J. Mater. Chem. A. 05/2013; 1(22):6535-6538.
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    ABSTRACT: A C3 -symmetric tris(bisurea) ligand L assembles with PO4 (3-) ions to form the tetrahedral cage [(PO4 )4 L4 ](12-) . The PO4 (3-) ions form the four vertices and each forms 12 NH⋅⋅⋅O hydrogen bonds with 6 urea groups. A unique trinuclear pinwheel-like helical complex [(SO4 )3 L2 ](6-) is formed from L and SO4 (2-) ions.
    Angewandte Chemie International Edition 04/2013; · 11.34 Impact Factor
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    ABSTRACT: Combining Co2 clusters with mixed H2bpdc and H2bpz ligands creates an unprecedented 3-fold interpenetrated 5-connected porous framework, which possesses the fascinating double-walled nanotubes structure assembled from nonuple and triple helices, and exhibits gas sorption properties.
    Dalton Transactions 03/2013; · 3.81 Impact Factor

Publication Stats

335 Citations
391.46 Total Impact Points

Institutions

  • 1999–2014
    • Northwest University
      Florida, United States
    • Northwest University
      • • Department of Chemistry
      • • Institute of Analytical Science
      Ch’ang-an, Shaanxi, China
  • 2010
    • China Three Gorges University
      Tung-hu, Hubei, China
    • Tianjin Normal University
      • College of Chemistry and Life Science
      Tianjin, Tianjin Shi, China
  • 2007–2009
    • Louyang Normal University
      Luoyang, Yunnan, China
  • 1999–2003
    • Lanzhou University
      Kao-lan-hsien, Gansu Sheng, China