Yan-Fei Qi

Jilin University, Yung-chi, Jilin Sheng, China

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Publications (13)35.83 Total impact

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    ABSTRACT: The reaction of polyoxometalate (POM) (NH4)6[Mo7O24], transition-metal (TM) ions (Cu2+ or Ag+) and a bridging ligand (bbtx) in the hydrothermal environment led to two hybrid coordination polymers, [Cu(bbtx)3][Mo6O19] (1) and [Ag2(bbtx)2][Mo6O19] (2). Luminescent measurements suggest that 1 mainly exhibits luminescent emission of bbtx, but 2 displays strong emission bands ascribed to the ligand-to-metal charge transfer (LMCTs). Compound 2 also shows reversible thermochromic luminescence from 300K-77K-300K. Introduction of [Mo6O19]2− into the Ag-bbtx network can lead to luminescent quench of 2 under irradiation of 300-W Xe light, due to reduction of Ag(I) into Ag(0) with breaking of Ag-N bonds of 2. The relevant mechanism was investigated by PXRD and XPS spectra, and the irradiated 2 was used as a catalyst for reduction of p-nitrophenol with good catalytic activity.
    No preview · Article · Jan 2016 · Journal of Coordination Chemistry
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    ABSTRACT: The reaction of Keggin-type polyoxometalate (POM) units, transition-metal (TM) ions, and a rigid bis(imidazole) ligand (1,4-bis(1-imidazolyl)benzene (bimb)) in a hydrothermal environment led to the isolation of four new POM-based metal-organic networks, [H2 L][CuL][SiW12 O40 ]⋅2 H2 O (1), [H2 L]2 [Co(H2 O)3 L][SiW11 CoO39 ]⋅6 H2 O (2), KH[CuL]2 [SiW11 CoO39 (H2 O)]⋅2 H2 O (3), and [CuL]4 [GeW12 O40 ]⋅H2 O (4; L=bimb). All four compounds were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction, and single-crystal X-ray diffraction. Compounds 1 and 3 are new 3D networks with 1D channels. Compounds 2 and 4 contain 2D networks, which further stack into 3D supramolecular networks. The contributions of pH value, the negative charge of the POM, and the TM coordination modes to the construction of 3D networks were elucidated by comparing the synthetic conditions and structures of compounds 1-4. The photocatalytic properties of compounds 1-4 were investigated using methylene blue (MB) degradation under UV light. All compounds showed good catalytic activity and structural stability. The possible catalytic mechanism was discussed on the basis of active-species trapping experiments. The different photocatalytic activities of compounds 1-4 were explained by comparison of the band gaps of different POM species and different packing modes of POM units in these hybrid compounds.
    No preview · Article · May 2015 · Chemistry - An Asian Journal
  • Yan-Fei Qi · Kun Xu · Li-Jun Lu · Juan Li · En-Bo Wang
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    ABSTRACT: Reaction of a flexible ligand with cobalt salt in the presence of polyoxovanadate produces a new composite solid, Co2(btx)4V4O12, 1 (btx = 1,4-bis(triazol-1-ylmethyl)benzene). The structure of 1 was determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectrum, and TG analysis. Compound 1 exhibits a 3-D 4,6-connected self-catenated net constructed from [V4O12]4− building blocks and the {Co(btx)2}2+ 3-D metal-organic cation polymer. The electronic properties of 1 have been investigated.
    No preview · Article · Apr 2013 · Journal of Coordination Chemistry
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    ABSTRACT: Silver nanoparticles (AgNPs) are being used widely and increasingly in various products and medical supplies due to their antibacterial activity. However, little is known about the impacts of the AgNPs. Herein, The primary purpose of this study was to investigate the cytotoxic effect of AgNPs in the human liver cell line (HL-7702). The water-soluble α-Methoxy-poly (ethylene glycol)-ω-mercapto (mPEG-SH)-coated AgNPs (40 nm) were synthesized, which showed superior stabilization and uniform dispersion in culture medium. The effect of mPEG-SH-coated silver nanoparticles on cell viability, leakage of lactate dehydrogenase (LDH), oxidative stress, mitochondrial membrane potential (MMP), and cell cycle was evaluated after the cells were treated with nanoparticles. The results showed that the coated AgNPs could be taken up by cells, decreased cell viability in dose- and time-dependent manners at dosage levels between 6.25 and 100.00 μg/mL, caused membrane damage (LDH leakage), and decreased the activities of superoxide dismutase and glutathione peroxides. The level of malondialdehyde, an end product of lipid peroxidation, was also increased in AgNPs-exposed cells. Moreover, flow cytometric analysis showed that AgNP exposure decrease MMP and cause G₂/M phase arrest. Thus, our data suggest that mPEG-SH-coated AgNPs have the potential toxicity that is associated with oxidative stress, apoptosis, and DNA damage.
    No preview · Article · Mar 2012 · Cell Biology and Toxicology
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    ABSTRACT: A structural determined heteropolytungstate, [K(4)(H(2)O)(8)Cl][K(4)(H(2)O)(4)PTi(2)W(10)O(40)]·NH(2)OH 1, has been synthesized and evaluated for in vitro antiviral activities against hepatitis B (HBV) and SARS virus. The identity and high purity of compound 1 were confirmed by elemental analysis, NMR, IR analysis and single-crystal X-ray diffraction. The compound 1, evaluated in HepG 2.2.15 cells expressing permanently HBV, significantly reduced the levels of HBV antigens and HBV DNA in a dose-dependent and time-dependent manner. EC(50) values were determined to be 54μM for HBeAg, 61μM for HBsAg and 2.66μM for supernatant HBV DNA, as compared to 1671, 1570, 169μM, respectively, for the commercially-available hepatitis B drug adefovir dipivoxil (ADV). Intracellular cccDNA, pgRNA and HBcAg were also found to be decreased by compound 1 in a concentration-dependent manner. Cytotoxicity results showed that compound 1 has low toxicity in HepG 2 cells with CC(50) value of 515.20μM. The results indicate that compound 1 can efficiently inhibit HBV replication in HepG 2.2.15 cells line in vitro. Additionally, compound 1 also shows high anti-SARS activity at an EC(50) of 7.08μM and toxicity with a CC(50) of 118.6μM against MDCK cells.
    No preview · Article · Nov 2011 · Antiviral research
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    ABSTRACT: The simultaneous use of bicarboxylate- and bipyridine-containing linear ligands to react with d10 metals affords four new polymeric compounds, [Zn(cis-chdc)(bpp)]·6H2O (1), [Zn(cis-chdc)(bpmp)] (2), [Cd2(cis-chdc)2(bpmp)(H2O)2] (3) and [Cd3(tp)3(bpp)2]•2DMF•6H2O (4) (H2chdc = 1,4-cyclohexanedicarboxylic acid; bpp = 1,3-bis(4-pyridyl)propane; bpmp = N,N′-bis(4-pyridylmethyl)piperazine; H2tp = terephthalic acid), which have been structurally characterized by elemental analysis, IR, TG, powder X-ray diffraction and single-crystal X-ray diffraction. Compound 1 possesses a 1-D ladderlike structural feature, compounds 2 and 3 show two different 2-D wavelike networks with the same (4•4) network topology, and compound 4 exhibits a 3-D open framework with (424•64) framework topology (similar to the CsCl-type body-centered cubic lattice). The structural features and the dimension evolution of the four compounds, along with the influence of nodes and mixed linear ligands are presented and discussed. The fluorescent properties of the four compounds are also investigated.
    No preview · Article · Apr 2011 · CrystEngComm
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    ABSTRACT: A new cobalt–vanadium composite solid, Co3(btx)5(H2O)V8O231 (btx = 1,4-bis(triazol-1-ylmethyl)benzene) has been synthesized. Compound 1 exhibits a novel three-dimensional (3D) 4, 6-connected self-catenated net constructed from novel [V8O23]6− building blocks and the {Co3(btx)5(H2O)2}6+ 3D metal–organic cation polymer. The magnetic study and electronic property of 1 have also been investigated.
    No preview · Article · Mar 2010 · Inorganic Chemistry Communications
  • Song Chang · Yan-Fei Qi · En-Bo Wang · Zhiming Zhang
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    ABSTRACT: Two novel Zn6 sandwiched polyoxometalates, [Zn(phen)2]2[Zn6(phen)2(AsW9O33)2] (1) and K11H2Zn[(ZnCl)6(AsW9O33)2]Cl·27H2O (2), have been synthesized and characterized by X-ray single-crystal analysis, IR, and fluorescence spectrum. The polyoxoanions in both compounds can be characterized as two {AsIIIW9O33}9− moieties linked through Zn6 transition-metal cluster to form the sandwich-type polyoxotungstates. In compound 1, six Zn atoms in the equatorial part of the polyoxoanions have two different coordination environments: four Zn sites exhibit distorted octahedral geometry, and the other two Zn atoms show square pyramidal geometry. In the polyoxoanion of compound 2, all Zn atoms are square pyramidal geometry, and held together to form a hexagonal metallocycle by edge-sharing oxygen atoms. In this Zn6 cluster, the shortest distance of neighboring Zn⋯Zn is 3.147(1)Å. In addition, compound 2 exhibits purple photoluminescence at room temperature.
    No preview · Article · Jan 2009 · Inorganica Chimica Acta
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    No preview · Article · Jun 2008 · ChemInform
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    ABSTRACT: The first {P(2)W(12)}-based trimeric polyoxotungstates encapsulating various "guest" transition-metal and alkali-metal ions have been reported, exhibiting potentially aqua-ligand-induced capability of "trapping" metal ions.
    No preview · Article · May 2008 · Chemical Communications
  • Yan-Fei Qi · Yang-gang Li · Enbo Wang · Dong-rong Xiao · Jin Hua
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    ABSTRACT: Four novel organic–inorganic hybrid arsenic-vanadate complexes, [Cu(phen)][(AsO4)(V 3O7)(H2O)] (1), [Cu(en)2]2[As8V14O42(H2O)] · 2.5H2O (2), [M(1,10-phen)3]2[As8V14O42(H2O)0.5] · 0.5H2O (M = Mn, 3, Cd, 4) (1,10-phen = 1,10-phenanthroline) have been hydrothermally synthesized for the first time and characterized by elemental analyses, XPS spectra, EPR spectra, IR spectra, TG analyses and single crystal X-ray diffraction. The structure of compound 1 consists of arsenic vanadate ribbons coordinated by the [Cu(phen)] complex, while compounds 2 to 4 possess a spherical [As8 V14 O42] cage with H2O molecules encapsulated. The unexpected preparation 1 and the synthesis of compounds 2 to 4 on the basis of same polyoxoanion structures show that the pH value of the reaction plays a crucial role in controlling the basic architectures.
    No preview · Article · Jul 2007 · Journal of Coordination Chemistry
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    ABSTRACT: Two novel compounds based on saturated Wells–Dawson polyoxometalate and copper–organonitrogen coordination polymer, (NH4)3(4,4′-H2bipy)[CuI(4,4′-bipy)]7[P2W18O62]2·10H2O 1 and [CuII(en)(2,2′-bipy)]3[P2W18O62]·3H2O 2 (en=ethylenediamine, bipy=bipyridine), have been hydrothermally synthesized. The structure of 1 represents the first 2-D network consisted of saturated Wells–Dawson polyoxoanions and transition–metal coordination polymers. Compound 2 is a novel Wells–Dawson polyoxoanion supported by two copper(II) complex fragments with mixed en and 2,2′-bipy ligands in a single W3O13 triplet.
    No preview · Article · Jun 2007 · Journal of Molecular Structure
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    ABSTRACT: To investigate the role of polyoxovanadates in network connectivity, two new organic-inorganic hybrid vanadates with three-dimensional entangled coordination frameworks, namely [Cu-2(biim)(3)V4O12] 1 and [Co-2(biim)(3)V4O12]center dot 4H(2)O 2 have been synthesized and characterized by infrared (IR), thermogravimetric analysis (TGA), and single-crystal X-ray diffraction. Crystal data for compound 1: triclinic, P-1, a 9.504( 2), b 10.650(2), c 11.993( 2) angstrom; a 72.13(3), angstrom 76.02(3), gamma 65.40(3)degrees; V 1041.4(4) angstrom(3), Z 2, R(final) 0.0492. Crystal data for compound 2: triclinic, P-1, a 9.037( 3), b 10.577(2), c 11.9470( 2) angstrom; a 87.80( 3), beta 81.71( 3), 85.29( 3)degrees; V 1125.8( 4) angstrom(3), Z 1, R(final) 0.0774. Compound 1 is a three-dimensional inclined hetero-catenated framework designed from two two-dimensional sub-layers, [Cu(biim) V4O12] and [Cu( biim)(2)]. Compound 2 is a rare case of a self-catenated 'ilc' network that displays an unusual 4(24) center dot 5 center dot 6(3) topology with the binuclear {Co2O4N6} units as eight-connected nodes.
    No preview · Article · Jan 2007 · Australian Journal of Chemistry

Publication Stats

165 Citations
35.83 Total Impact Points


  • 2010-2016
    • Jilin University
      • School of Public Health
      Yung-chi, Jilin Sheng, China
  • 2007-2009
    • Northeast Normal University
      • Department of Chemistry
      Hsin-ching, Jilin Sheng, China