Yao-Yu Wang

Northwest University, KYL, Florida, United States

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Publications (184)596.44 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A new 2D highly flexible and breathing porous framework, [CuL(Me2NH)]∙DMF∙H2O (1) (H3L = 5-(4’-carboxylphenoxy)nicotic acid) has been synthesized using a tritopic linker with flexible joint. The desolvated framework, [CuL(Me2NH)] (1a), undergoes structural contraction, and exhibits selective and double-step hysteretic adsorption for CO2. Furthermore, exposure to CH2Cl2 at room temperature, a unique single-crystal-to-single-crystal transformation occurred between 1 and [Cu2L2(Me2NH)2(H2O)2]∙5H2O (1b).
    Dalton Transactions 04/2015; DOI:10.1039/C5DT00460H · 4.10 Impact Factor
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    ABSTRACT: Three new Cd(II)-MOFs, [Cd(L1)0.5(bpp)] (1), [Cd(L1)0.5(bipy)] (2), and [Cd(L2)0.5(bipy)] (3) [H4Ln = (1,1':4',1''-terphenyl)-2',x,x'',5'-tetracarboxylic acid (n = 1, x = 3, and n = 2, x = 4), bpp = 1,3-di(4-pyridyl)propane, and bipy = 2,2'-bipyridine], have been synthesized by Cd(II) ions and isomeric H4Ln ligands in the presence of auxiliary ligands via solvothermal reaction, which have been fully characterized by elemental analyses, FT-IR spectroscopy, power X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). Complex 1 is a three-dimensional (3D) pillar-layered network built by L14- and bridging bpp co-ligands, showing a binodal (4,8)-connected gsp2 topology with symbol of (44.62)(416.612), 2 was successfully yielded by bipy instead of bpp ligand in the assembly of 1, giving a 2D 4-connected sql net, and 3 is a 3D reticular framework with [Cd2(COO)4] SBUs based on H4L2 ligand, displaying a (4,4)-connected lvt (42.84) topology. X-ray diffraction analysis revealed that the structures of MOFs can be mediated by the steric effect of tetracarboxylates and secondary co-ligands. The solid-state luminescent properties of MOFs have been measured carefully by ultraviolet irradiation at room temperature. Especially for 3, exhibiting a high sensitivity for Fe3+ in aqueous solution with mixed metal ions, which make it be a promising crystalline material as luminescent probe to Fe3+. Importantly, 3 can keep its original framework and be reused in sensing experiments. The sensing mechanism has also been studied in detail.
    Dalton Transactions 04/2015; DOI:10.1039/C5DT00492F · 4.10 Impact Factor
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    ABSTRACT: A microporous metal‒organic framework, [H2N(Me)2]2[Zn4(L)2(H2O)1.5]∙5DMF∙H2O (1∙DMF) or [H2N(Me)2]2[Zn4(L)2(H2O)1.5]∙4DMA∙6H2O (1∙DMA) has been synthesized under solvothermal condition using an undeveloped asymmetrical pentacarboxylate ligand, 2,4-di(3ʹ,5ʹ-dicarboxylphenyl)benozoic acid (H5L). Structure analysis demonstrates that 1 is a 3D anionic framework based on two kinds of dinuclear [Zn2(COO)5(H2O)] secondary building units (SBUs), which presents a rare framework constructed from ternary SBUs and shows a new (5,5,5)-connected topology. The desolvated anionic structure of 1∙DMF (1a) contains two shapes of 1D channel with suitable pore sizes and highly polar pore system decorated by open metal sites, diethylammonium cations and carboxylic oxygen atoms, exhibiting multipoint interactions between CO2 molecules and the framework, resulting in high CO2 uptake and significant selectivity for CO2 over CH4 and N2. In addition, the 1∙DMF and 1∙DMA display solid-state photoluminescence stemming from the ligand-centered fluorescent emissions of H5L.
    04/2015; DOI:10.1039/C5QI00025D
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    ABSTRACT: The first use of H4nbtc ligand afford a novel 2D Cu(II) metal-cluster-based coordination polymer (MCCP), [Cu4(nbtc)1.5(μ3-OH)2(H2O)4·8H2O (1) (H4nbtc = 6,6′-dinitro-2,2′,4,4′-biphenyl tetracarboxylic acid), in which the boat- and chair-shaped tetranuclear cooper (II) clusters [Cu4(μ3-OH)2]6+ coexist unprecedentedly. Interestingly, the chair-shaped CuII4 cluster-based 1D ladder chain perfectly threaded into the rectangle windows of the 2D grids constructed by boat-shaped CuII4 clusters and H4nbtc. And the magnetic property has also been investigated.
    Inorganic Chemistry Communications 03/2015; 53. DOI:10.1016/j.inoche.2015.01.023 · 2.06 Impact Factor
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    ABSTRACT: The incorporation of Lewis base sites and open metal cation sites into metal-organic frameworks (MOFs) is a potential route to improve selective CO2 adsorption from gas mixture. In this study, three novel amino-functionalized metal-organic frameworks (MOFs): Mg-ABDC [Mg3(ABDC)3(DMF)4], Co-ABDC [Co3(ABDC)3(DMF)4] and Sr-ABDC [Sr(ABDC)(DMF)] (ABDC = 2-aminoterephthalate) were synthesized by solvothermal reactions of 2-aminoterephthalic acid (H2ABDC) with magnesium, cobalt and strontium metal centers, respectively. Single-crystal structure analysis showed that Mg-ABDC and Co-ABDC were isostructural compounds comprising two-dimensional layered structures. The Sr-ABDC contained a three-dimensional motif isostructural with its known Ca analogue. The amino-functionalized MOFs were characterized by powder X-ray diffraction, thermal gravimetric analysis and N2 sorption. The CO2 and N2 equilibrium adsorption capacities were measured at different temperatures (0, 25 and 35 [degree]C). The CO2/N2 selectivities of
    Dalton Transactions 03/2015; DOI:10.1039/C4DT03927K · 4.10 Impact Factor
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    ABSTRACT: Two new 3D coordination polymers, [Zn3(L)2(H2O)4] · H2O (1) and [Zn5(μ3-OH)4(L)2(H2O)2] (2) (H3L = 3-(2’,5’-dicarboxylphenyl)benzoic acid), have been synthesized under hydrothermal conditions by adding different amount of NaOH. Structural analyses show that both of them contain 1D inorganic Zn(II)-chains as rod-shaped secondary building units (SBUs) but they are in different forms. The rod-shaped Zn(II)-chain of 1 is only Zn-carboxylate chain, while the one in 2 is formed by the independent Zn5(COO)6 clusters connected by hydroxyl oxygen. Furthermore, the thermal and luminescent properties of both compounds have been studied.
    Inorganic Chemistry Communications 03/2015; 56. DOI:10.1016/j.inoche.2015.03.017 · 2.06 Impact Factor
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    ABSTRACT: Based on the N-Donor auxiliary ligand effect, two new Ni(II) coordination polymers [Ni2(HL)2(bpe)2] (1) and [Ni(HL)(bipy)(H2O)2] (2) [H3L = 2-(4'-carboxypheny)terephthalic acid; bpe = 1,2-bis(4-pyridyl)ethane; bipy = 4,4'-bipyridine] have been successfully synthesized and characterized by single-crystal X-ray diffraction study, elemental analysis, IR spectra, TGA analyses and powder X-ray diffraction (PXRD). This work presents a comparative study on the tuning of structural topologies by using two N-Donor ligands with different lengths as auxiliary ligands. The structural determination reveals that complex 1, incorporating bpe ligands, features a three-dimensional (3D) 4-connected 4-fold dia interpenetrating architecture with the point symbol of 66, while 2, containing bipy ligands, exhibits a two-dimensional (2D) sql layer structure with a 4-connected (44.62) topology. Moreover, the magnetic properties for 1 and 2 were also measured and compared on account of their different structures.
    Inorganic Chemistry Communications 03/2015; DOI:10.1016/j.inoche.2015.03.018 · 2.06 Impact Factor
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    ABSTRACT: Structural transformation has aroused wide interest and has emerged as a promising approach for the design and synthesis of novel coordination polymers. In this work, we found interesting structural transformation phenomena triggered from a nickel coordination polymer (CP). Two temperature-dependent two-dimensional (2D) CPs, 1 and 2 were synthesized from hydrothermal reactions, while the other two CPs, 2D 3 and 3D 4 were the products of the in situ thermal decomposition of 1. Interestingly, 1 could undergo methanol-mediated transformation to afford 2 and 2 might convert to 1 under the condition of adding bipy in water. The multi-step conversions from 1 to 3 and 3 to 4 triggered by heat treatment in the solid state accompany the very rare dynamic response of a sequential release of coordinated water and partial organic ligands. More importantly, the mechanism of the transformation has also been studied in detail. Moreover, 3 could revert back to 1 quickly upon exposure to air, and this reversible process of dehydration–rehydration could be repeated at least ten times, which could highlight the application for their use in moisture sensors.
    CrystEngComm 02/2015; 17(8). DOI:10.1039/C4CE02333A · 3.86 Impact Factor
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    ABSTRACT: The 1D complex [(CuL0.5 H2 O)⋅H2 O]n (1) (H4 L=2,2'-bipyridine-3,3',6,6'-tetracarboxylic acid) undergoes an irreversible thermally triggered single-crystal-to-single-crystal (SCSC) transformation to produce the 3D anhydrous complex [CuL0.5 ]n (2). This SCSC structural transformation was confirmed by single-crystal X-ray diffraction analysis, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD) patterns, variable-temperature powder X-ray diffraction (VT-PXRD) patterns, and IR spectroscopy. Structural analyses reveal that in complex 2, though the initial 1D chain is still retained as in complex 1, accompanied with the Cu-bound H2 O removed and new O(carboxyl)Cu bond forming, the coordination geometries around the Cu(II) ions vary from a distorted trigonal bipyramid to a distorted square pyramid. With the drastic structural transition, significant property changes are observed. Magnetic analyses show prominent changes from antiferromagnetism to weak ferromagnetism due to the new formed Cu1-O-C-O-Cu4 bridge. The catalytic results demonstrate that, even though both solid-state materials present high catalytic activity for the synthesis of 2-imidazolines derivatives and can be reused, the activation temperature of complex 1 is higher than that of complex 2. In addition, a possible pathway for the SCSC structural transformations is proposed. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Chemistry - A European Journal 02/2015; 21(12). DOI:10.1002/chem.201405984 · 5.70 Impact Factor
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    ABSTRACT: A doubly interpenetrated MOF was constructed using a new pyridyl carboxylate ligand with active pyridyl sites, which exhibits highly efficient luminescence sensing for Cu(2+) ions and sorption selectivities of CO2 over CH4 and N2.
    Dalton Transactions 02/2015; 44(10). DOI:10.1039/c4dt02481h · 4.10 Impact Factor
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    ABSTRACT: Three new coordination polymers (CPs) based on rigid ligand 5-Aminonicotinic acid (5-anaH), [Cd(5-ana)2]·(H2O)2 (1), [Cd(5-ana)(HCOO) ] (2) and [Cu(5-ana)2] (3), have been synthesized under different solvent media and temperatures. All CPs are characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, powder X-ray diffraction and thermogravimetric analysis. Compound 1 is a two-dimensional (2D) (4,4)-connected layered structure contains 1D open channels. 2 shows a 2-nodal (3,5)-connected three-dimensional (3D) framework with {52.6}{} topology. While 3 displays a 3D (3,6)-connected homochiral framework with {42.6}2{} topology. The solid-state photoluminescence for 1 and 2 were also studied.
    Journal of Molecular Structure 02/2015; 1091. DOI:10.1016/j.molstruc.2015.02.054 · 1.60 Impact Factor
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    ABSTRACT: By a less-exploited strategy, a stable framework was constructed by using 4,4'-biphenyldicarboxylic acid (H2bpdc) and methyl-functionalized 3,3',5,5'-tetramethyl-4,4'-bipyrazole (H2bpz) coligands, revealing a new (6,8)-connected net based on two extremely rare trinuclear and tetranuclear metal-carboxylate-pyrazolate clusters. The framework is very porous and possesses not only high CO2 loadings but also very high CO2/N2 selectivities at 308 and 313 K because of the polar pore surface decorated by clusters, pyrazolyl units, and confined cages with methyl groups dangling. Importantly, GCMC simulation identified two favorable CO2 sorption sites located sequentially near Co3(pz)3 and Co3(CO2)2(pz) motifs of the tetranuclear cluster, and the multipoint framework-CO2 interactions were distinguished. The framework also displays remarkable stability toward water and organic solvents.
    Inorganic Chemistry 01/2015; 54(4). DOI:10.1021/ic502733v · 4.79 Impact Factor
  • Yao-Yu Wang, Guo-Ping Yang, Yun-Long Wu
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    ABSTRACT: Three new solvent-induced metal-organic frameworks (MOFs), [Cd(H2L)(H2O)3]•NMP (1), [Cd3(L)(H2O)4(OH)2] (2) and [Cd(L)0.5(H2O)2]•H2O (3), have been rationally designed and successfully prepared via solvothermal reaction by the multidentate phenyltetracarboxylic acid [1,1':4',1''-terphenyl]-2',3,3'',5'-tetracarboxylic acid (H4L) and Cd(II) salts in different solvent systems. The structural analyses indicate that the H2L/L ligands took three different coordination fashions in 1–3 and thus resulted in the diversities of targeted MOFs. The solid state luminescent properties of 1–3 were conducted under the irradiation of ultraviolet at ambient temperature, especially for 3 showing a high selectivity and sensitivity for Cu2+ ions and nitrobenzene (NB) because of the quenching effect, which thus could be a potential crystalline material for detecting these substances. Moreover, there are also discussions of the mechanism of quenching effect and sensing properties of 3 in detail.
    Dalton Transactions 12/2014; 44(7). DOI:10.1039/C4DT03415E · 4.10 Impact Factor
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    ABSTRACT: Employing an uninvestigated eight N-donor bitriazole ligand 5’-(pyrazin-2-yl)-2H,4’H-3,3’-bi(1,2,4-triazole) (H2pzbtz), five complexes, {[Zn2(pzbtz)(SO4)(H2O)2]•2H2O}n(1), {[Cd(pzbtz)]•3H2O}n (2), [Zn3(Hpzbtz)2(SO4)2(H2O)6] (3), [Co(Hpzbtz)2(H2O)2] (4) and {[Co2(pzbtz)2(H2O)2]•4H2O}n (5), have been solvothermally synthesized by altering reaction solvents and temperatures. Complex 1 shows a three-dimensional (3D) framework with a very rare (3,5)-connected fsc-3,5-Cmce-2 topology. Complex 2 exhibits a (4,4)-connected 3D pts framework with 1D channel. Complexes 3 and 4 are discrete trinuclear and mononuclear molecules, respectively. Complex 5 discloses a chiral 3D framework based on novel trinuclear Co3(tr)4 cluster, and featuring an unusual 6-connected lcy topology. In the five complexes, H2pzbtz show a very variety of geometrical configurations and coordination modes. Due to the planarity of H2pzbtz, complexes 1-3 display strong photoluminescence, especially 1 features highly selective luminescent sensing for Cu2+ ion and nitrobenzene molecule. In addition, 2 shows highly selective adsorption for CO2 over CH4, and 5 reveals antiferromagnetic exchange interactions among the Co2+ ions.
    Dalton Transactions 11/2014; 44(3). DOI:10.1039/C4DT03129F · 4.10 Impact Factor
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    ABSTRACT: Seven complexes, namely, {[Co2[(R, S)-bpdado]2(CH3CN)2(H2O)2]•2H2O}n 1, {Cu[(R, S)-bpdado](H2O)}n 2, {[Cu2[(R, S)-bpdado]2(H2O)2]•H2O}n 2′, {[Cu(R, S)-bpdado]•EtOH}n 2′′, {Cu[(R, S)-bpdado](phen)}2 (phen = 1,10-phenanthroline) 3, {Cu[(R, S)-bpdado](phen)(H2O)}2•8H2O 4 and {Cu[(R, S)-bpdado](dpy)(H2O)}2•4H2O (dpy = 2,2′-pyridine) 5 have been obtained via solvothermal or layered-diffusional reaction based on an axially chiral ligand, (R, S)-2,2′-bipyridyl-3,3′-dicarboxylic acid-1,1′-dioxide ((R, S)-H2bpdado). These complexes tend to form under thermodynamic controlling in complexes crystallization process. Among them, the 2′ and 2′′ were reported and obtained along with the preparation of 2. Five new complexes 1-5 are characterized by single-crystal X-ray diffraction, elemental analyses, X-ray powder diffraction, IR and thermogravimetric analyses. Four different structural complexes, 2D achiral layers 1, 2 and 2′′, and 1D nanotubular structure 2′, are constructed by M3[(R, S)-bpdado] tecton (M = Co(II) or Cu(II)) in the different arrangement modes. When various N-donor ligands are used, different binuclear complexes 3-5 are assembled by Cu2[(R, S)-bpdado] tecton in the same arrangement mode. Apart from the arrangement modes of tecton, some other elements are also discussed, which influence the final structures, such as the coordination modes and conformations of (R, S)-bpdado, the different metal ions, the reaction temperature, N-donor ligand and solvent system.
    CrystEngComm 10/2014; 17(4). DOI:10.1039/C4CE02008A · 3.86 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 (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; 43(41). DOI:10.1039/C4DT01086H · 4.10 Impact Factor
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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; 16(40). DOI:10.1039/C4CE01359J · 3.86 Impact Factor
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    ABSTRACT: To study the steric effect of the flexible dicarboxylate ligands on the resultant formations of coordination polymers (CPs), four new PbII CPs [Pb(1,2-pda)(H2O)]n (1), [Pb(1,3-pda)]n·nH2O (2), [Pb2(1,4-pda)2(H2O)]n·2nH2O (3a and 3b) have been produced by the isomeric phenylenediacetic acids (H2pda). The X-ray crystallography study reveals that CP 1 is a two-dimensional (2D) 4-connected sql (44.62) network via the weak Pb···O interactions built on 1D chain-like structure. CP 2 crystallizes in orthorhombic system with chiral space group P212121, showing a 4-connected sra (42.63.8) framework where a left-handed helical motif is formed by PbII ions and trans-1,3-pda ligands. More interestingly, CPs 3a and 3b are two true 3D polymorphs and have the different morphology. Topologically, the framework of 3a exhibits a 4-connected lon 66 motif, while that of 3b is a (4,6)-connected fsh (43.63)2(46.66.83) net. It is found that the three isomeric pda anions display the various coordination fashions in four CPs. The different structural arrangements show that the steric effect of the isomeric H2pda tectons has a positive role in directing the final products of PbII CPs. Also, the fluorescent properties of the CPs were studied in the solid state at room temperature.
    Journal of Solid State Chemistry 07/2014; DOI:10.1016/j.jssc.2014.07.018 · 2.20 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 06/2014; 50(63). DOI:10.1039/c4cc03049d · 6.72 Impact Factor
  • Jie Zhao, Dong Yang, Yanxia Zhao, Xiao-Juan Yang, Yao-Yu Wang, Biao Wu
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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 06/2014; 53(26). DOI:10.1002/anie.201402169 · 13.45 Impact Factor

Publication Stats

3k Citations
596.44 Total Impact Points


  • 1999–2015
    • Northwest University
      KYL, Florida, United States
    • Northwest University
      • Department of Chemistry
      Ch’ang-an, Shaanxi, China
  • 2013–2014
    • Northwestern University
      • Department of Chemistry
      Evanston, Illinois, United States
  • 2010
    • Tianjin Normal University
      • College of Chemistry and Life Science
      Tianjin, Tianjin Shi, China
  • 2006–2007
    • National Taiwan University
      • Department of Chemistry
      T’ai-pei, Taipei, Taiwan
    • Yan Shan University
      Sandzhi, Xinjiang Uygur Zizhiqu, China
  • 1999–2003
    • Lanzhou University
      Kao-lan-hsien, Gansu Sheng, China