Lijuan Chen

Henan University, K’ai-feng-shih, Henan Sheng, China

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Publications (86)207.56 Total impact

  • Junwei Zhao · Jiancai Liu · Qing Han · Lijuan Chen
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    ABSTRACT: Heterometallic polyoxotungstates (HMPOTs) are still a challenging and attractive area in polyoxometalate chemistry despite having arose remarkable interest in recent years not only on account of a variety of structures and topologies but also because of their multiple potential applications in catalysis, magnetism, nanoscience, electochemistry and photochemistry. This brief highlight article is principally focused on an overview of four types of HMPOTs: polyoxotungstate-based main-group (MG) and transition-metal (TM) heterometallic derivatives (PMGTMHDs), polyoxotungstate-based TM and TM heterometallic derivatives (PTMTMHDs), polyoxotungstate-based rare-earth (RE) and TM heterometallic derivatives (PRETMHDs) and polyoxotungstate-based RE and RE heterometallic derivatives (PREREHDs) and gives a summary of some representative examples involving their syntheses, structures and related properties. Besides, an outlook in this field is also provided.
    No preview · Article · Jan 2016 · CrystEngComm
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    ABSTRACT: Three types of lanthanoid-containing isopolyoxotungstates have been prepared by reacting Na2WO4·2H2O with Ln(NO3)3·6H2O in the presence of dimethylamine hydrochloride and structurally characterized. The luminescent properties were investigated.
    No preview · Article · Nov 2015 · Crystal Growth & Design
  • Xiuhua Wang · Qing Han · Lijuan Chen · Junwei Zhao
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    ABSTRACT: Two new 1-D and 2-D inorganic-organic hybrid polyoxomolybdates [H2dap]2[x-Mo8O26]·2H2O (1) and [Cu(dap)2]2[β-Mo8O26] (2) (dap = 1,2-propanediamine) have been hydrothermally synthesized and structurally characterized by elemental analyses, IR spectra, powder X-ray diffraction and single-crystal X-ray diffraction. The most remarkable structural differences between them are that 1 displays a 1-D chain constructed from [x-Mo8O26]4 - clusters through two terminal O atoms from adjacent [x-Mo8O26]4 - clusters whereas 2 demonstrates the 2-D extended layer made up of [β-Mo8O26]4 - clusters via [Cu(dap)2]2 + connectors. To our knowledge, the [x-Mo8O26]4 - cluster in 1 is reported for the first time. The thermogravimetric (TG) curve of 1 shows a two-step weight loss whereas the TG decomposition of 2 only proceeds in one stage. Additionally, their electrochemical behaviors and their photocatalytic degradation properties towards rhodamine-B are also investigated.
    No preview · Article · Nov 2015 · Inorganic Chemistry Communications

  • No preview · Article · Nov 2015 · ChemInform
  • Lijuan Chen · Xing Ma · Wen Yang · Junwei Zhao
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    ABSTRACT: Owing to their unique and abundant structures and potential multi-fold applications in various fields such as luminescence, magnetism, catalysis, etc., rare-earth-containing polyoxometalates (RECPs) play an important role in the development of polyoxometalate chemistry. In this article, the major progress in RECPs made in the past decade involving synthetic strategies, structural characteristics and some significant properties related to optics, catalysis and magnetism is highlighted and discussed. The final section is committed to looking forward to some future perspectives in this field and providing some personal insights or viewpoints for the ongoing trends in the future. This journal is
    No preview · Article · Sep 2015 · CrystEngComm
  • Hailou Li · Bo Shao · Yanyan Li · Lijuan Chen · Junwei Zhao
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    ABSTRACT: Two octamolybdate-based organic-inorganic hybrids functionalized by 1,3-bis[tris(hydroxymethyl)methylamino]propane (H6bthmap) Na2H4[γ-Mo8O26(H5bthmap)2]·2H2O (1) and [NH4]6{[Cu(H3bthmap)]2(β-Mo8O26)} (2) have been synthesized through the aqueous synthetic method and structurally characterized by elemental analyses, IR spectra, UV spectra, thermogravimetric (TG) analysis and single-crystal X-ray diffraction. X-ray crystallography reveals that 1 consists of a classic [γ-Mo8O26]4 - polyoxoanion decorated by two flexible [H5bthmap]- ligands through two O atoms from two [H5bthmap]- ligands and 2 contains a [β-Mo8O26]4 - polyoxoanion with bisupporting [Cu(H3bthmap)]- anions via two terminal O atoms from the [β-Mo8O26]4 - polyoxoanion. As far as we know, 1 and 2 represent the first octamolybdate-based hybrids with 1,3-bis[tris(hydroxymethyl)methylamino]propane ligands. The TG curves of 1 and 2 indicate two steps of weight loss and three steps of weight between 25 and 980°C, respectively. Furthermore, the electrochemical and electrocatalytic properties of 1 and 2 have been investigated.
    No preview · Article · Sep 2015 · Inorganic Chemistry Communications
  • Hailou Li · Yamin Cheng · Jie Luo · Pengtao Ma · Junwei Zhao · Lijuan Chen
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    ABSTRACT: Two organic-inorganic composite vanadoborates Na2(Hen)4[B18V12O60]·16H2O (1) (en = ethylenediamine) and (H2en)6[B18V12O60]2·2tepa·11H2O (2) (tepa = tetraethylenepentamine) have been hydrothermally synthesized and characterized by elemental analyses, inductively coupled plasma atomic emission spectrometry (ICP-AES) analyses, IR spectra, and X-ray crystallography. Single-crystal structural analyses show that 1 exhibits a 2-D polyoxovanadium borate sheet architecture with a 4-connected topology established by [B18V12O60]6− units via Na+ bridges whereas the molecular unit of 2 consists of two discrete [B18V12O60]6− clusters, six diprotonated [H2en]2+ cations, two tepa molecules and eleven lattice water molecules.
    No preview · Article · Aug 2015 · Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry
  • Wen Yang · Hailou Li · Yanyan Li · Lijuan Chen · Junwei Zhao
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    ABSTRACT: A class of 3s-5d-4f mixed metal substituted sandwich-type arsenotungstates [H2N(CH3)2]8H3[LnNa(H2O)4(OH)WO(H2O) (B-α-AsW9 O33)2]·8H2O [Ln = LaIII (1), CeIII (2), PrIII (3)] have been isolated from an aqueous solution reaction system (pH = 4) of Na2WO4·2H2O, C2H7N·HCl, NaAsO2 and Ln(NO3)3·6H2O and structurally characterized by elemental analyses, IR spectra, UV spectra and single-crystal X-ray diffraction. It is the most prominent in 1-3 that the [LnNa(H2O)4(OH) WO(H2O)(B-α-AsW9O33)2]11- polyanion consists of two trivacant Keggin [B-α-AsW9O33]9- moieties linked by one [WO(H2O)]4+ group and a dimeric [LnNa(H2O)4(OH)]3+ group resulting in the special 3s-5d-4f mixed metal substituted sandwich-type assembly. Interestingly, lanthanide and sodium ions simultaneously occupy the two positions located at the central belt of 1-3 with the site occupancy of 50% for each position. Moreover, the electrochemical and electrocatalytic properties of only 1 and 2 have been measured by cyclic voltammetry (CV) in 0.5 mol·L-1 Na2SO4+H2SO4 aqueous solution. 1 and 2 illustrate electrocatalytic activities for the hydrogen peroxide reduction.
    No preview · Article · Aug 2015 · Inorganic Chemistry Communications
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    ABSTRACT: By the rational self-assembly of trivacant Keggin precursor [B-α-SbW9O33]9- with Fe3+ and Ce3+ cations in the conventional aqueous solution, a novel FeIII-CeIII heterometallic sandwich-type tungstoantimonate [Ce(H2O)8][Ce(H2O)6] [Fe4(H2O)10(B-β-SbW9O33)2]·16H2O (1) has been successfully synthesized and further structurally characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. Structural analysis indicates that the 2-D infinite sheet of 1 consists of the Krebs' sandwich-type [Fe4(H2O)10(B-β-SbW9O33)2]6- subunits and Ce3 + linkers. 1 represents the rare purely inorganic FeIII-CeIII heterometallic tungstoantimonate derivative with the 2-D infinite sheet. The electrochemical and electrocatalytic properties of 1 have been systemically studied in 0.5 mol·L-1 Na2SO4 + H2SO4 supporting electrolyte, moreover, 1 exhibits the obvious electrocatalytic activity towards the reduction of BrO3- and NO2-.
    No preview · Article · Aug 2015 · Inorganic Chemistry Communications
  • Hailou Li · Wen Yang · Yun Chai · Lijuan Chen · Junwei Zhao
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    ABSTRACT: Single crystals of Na13H7 [Ce(SeW17O59)2]·31H2O are prepared by reaction of Na2WO4 and Na2SeO3 with (NH4)2Ce(NO3)6 in an aqueous KCl-containing solution at pH 2 (stirring, 30 min; 17% yield).
    No preview · Article · Jul 2015 · ChemInform
  • Junwei Zhao · Lijuan Chen · Fang Zhang · Xing Ma · Jie Luo
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    ABSTRACT: Two classes of novel tetra-iron substituted sandwich-type arsenotungastates (ATs) with supporting lanthanide (Ln) pendants KNa2 [Ln(H2O)7][Fe4(H2O)10(B-β-AsW9O33)2]•21H2O [Ln = LaIII (1), PrIII (2), NdIII (3), SmIII (4)] and [Ln(H2O)8]2[Fe4(H2O)8(L-thr)2(B-β-AsW9O33)2]•20H2O [Ln = LaIII (5), PrIII (6), NdIII (7), SmIII (8), EuIII (9), GdIII (10), TbIII (11), DyIII (12), ErIII (13)] (L-thr = L-threonine) have been synthesized by the hydrothermal reaction of the [As2W19O67(H2O)]14– precursor with Fe3+ cations and Ln3+ cations in the presence of L-thr or L-leucine and L-alanine and further characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. Structural analyses indicate that 1–4 display the inorganic 2-D sheet architecture constructed from tetra-iron sandwiched AT [Fe4(H2O)10(B-β-AsW9O33)2]6– fragments by bridging [Ln(H2O)7]3+ cations whereas the molecular structures of the isostructural 5–13 consist of an organic–inorganic hybrid tetra-iron substituted sandwich-type AT [Fe4(H2O)8(L-thr)2(B-β-AsW9O33)2]6– fragment and two pendant [Ln(H2O)8]3+ cations. As far as we know, 1–4 represent the rare inorganic 2-D extended ATs based on transition-metal substituted sandwich-type polyoxometalate units and Ln linkers and 5–13 are the first Fe–Ln heterometallic ATs with aminoacid ligands. The solid state photoluminescence (PL) measurements of 9 and 11 have been performed at room temperature. The PL emission of 9 is mainly derived from the characteristic 5D0→7F2 (J = 4–0) transitions of the EuIII cations whereas the PL behavior of 11 stems from the common contribution of the 5D4→7FJ (J = 5–3) transitions of TbIII ions and oxygen-to-metal (O→W) charge-transfer transitions of AT segments. The thermogravimetric (TG) analyses of 1–4 and 6–12 have been investigated.
    No preview · Article · May 2015 · Dalton Transactions
  • Junwei Zhao · Lijuan Chen · Xing-Hua Li · Jing Cao · Xing Ma · Jie Luo
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    ABSTRACT: The rational self-assembly of trilacunary Keggin precursor with Fe3+ and RE3+ (rare-earth) ions via a conventional aqueous solution method has led to a series of novel tungstoantimonate-based Fe–RE heterometallic derivatives [Pr(H2O)8][Pr(H2O)6][Fe4(H2O)10(B-β-SbW9O33)2]•16 H2O (1) and [RE(H2O)7]2[Fe4(H2O)10(B-β-SbW9O33)2]•22H2O [RE = TbIII (2), DyIII (3), LuIII (4), YIII (5)], which have been further structurally characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), single-crystal X-ray diffraction and thermogravimetric (TG) analyses. To the best of our knowledge, 1–5 represent the first purely inorganic Fe–RE heterometallic tungstoantimonates based on trilacunary Keggin [B-β-SbW9O33]9– unit. In 1, the tetra-FeIII substituted sandwich-type unit [Fe4(H2O)10(B-β-SbW9O33)2]6– is built up of two trilacunary Keggin subunits [B-β-SbW9O33]9– sandwiching a rhomb-like {FeIII4} cluster, and then the disordered PrIII cations work as bridges to link adjacent sandwich-type units [Fe4(H2O)10(B-β-SbW9O33)2]6–, giving rise to the first 2-D extended sheet based on tungstoantimonate fragments and Fe–RE heterometallic cations. 2–5 are isomorphic and exhibit the discrete structure composed of a tetra-FeIII substituted sandwich-type unit [Fe4(H2O)10(B-β-SbW9O33)2]6– and two supporting [RE(H2O)8]3+ cations. The electrochemical and electrocatalytic properties of 1 and 2 have been investigated in detail in 0.5 mol•L−1 Na2SO4 + H2SO4 supporting electrolyte and both 1 and 2 illustrate the obvious electrocatalytic activity to the reduction of NO2– and BrO3–.
    No preview · Article · May 2015 · CrystEngComm
  • Jie Luo · Pengfei Cheng · Junwei Zhao · Lijuan Chen
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    ABSTRACT: A new organic–inorganic hybrid silicotungstate [Cu2(phen)2Cl(H2O)(OH)]2[α-SiW12O40]·8 H2O (1) (phen = 1,10-phenanthroline) with supporting dinuclear copper complexes has been hydrothermally synthesized and structurally characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The molecular unit of 1 consists of two pendant coordination cations [Cu2(phen)2Cl(H2O)(OH)]2+ and one saturated Keggin-type silicotungstate polyoxoanion [α-SiW12O40]4− and eight lattice water molecules. The most intriguing feature is that each bi-copper cation [Cu2(phen)2(μ2-Cl)(H2O)(OH)]2+ is constructed from two [Cu(phen)]2+ cations linked by one μ2-Cl and one hydroxyl bridges. Magnetic measurements indicate that 1 demonstrates the ferromagnetic exchange interactions within CuII centers.
    No preview · Article · May 2015 · Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry
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    ABSTRACT: Induced pluripotent stem cells (iPS) exhibit enhanced survival and proliferation in ischemic tissues. However, the therapeutic application of iPS cells is limited by their tumorigenic potential. We hypothesized that iPS cells can transmit cytoprotective signals to cardiomyocytes via exosomes/microvesicles. Exosomes/microvesicles secreted from mouse cardiac fibroblast (CF)-derived iPS cells (iPS-exo) were purified from conditioned medium and confirmed by electron micrograph, size distribution and zeta potential by particle tracking analyzer and protein expression of the exosome markers CD63 and Tsg101. We observed that exosomes are at low zeta potential, and easily aggregate. Temperature affects zeta potential (-14 to -15mV at 23°C vs -24mV at 37°C). The uptake of iPS-exo protects H9C2 cells against H2O2-induced oxidative stress by inhibiting caspase 3/7 activation (P<0.05, n=6). Importantly, iPS-exo treatment can protect against myocardial ischemia/reperfusion (MIR) injury via intramyocardial injection into mouse ischemic myocardium before reperfusion. Furthermore, iPS-exo deliver cardioprotective miRNAs, including nanog-regulated miR-21 and HIF-1α-regulated miR-210, to H9C2 cardiomyocytes in vitro. Exosomes/microvesicles secreted by iPS cells are very effective at transmitting cytoprotective signals to cardiomyocytes in the setting of MIR. iPS-exo thus represents novel biological nanoparticles that offer the benefits of iPS cell therapy without the risk of tumorigenicity and can potentially serve as an "off-the-shelf" therapy to rescue ischemic cardiomyocytes in conditions such as MIR. Copyright © 2015. Published by Elsevier Ireland Ltd.
    Full-text · Article · May 2015 · International journal of cardiology
  • Hailou Li · Wen Yang · Yun Chai · Lijuan Chen · Junwei Zhao
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    ABSTRACT: A novel cerium(IV)-hybridizing selenotungstate with Dawson-like structure Na13H7[Ce(SeW17O59)2] · 31H2O (1) has been synthesized by reaction of Na2WO4 · 2H2O, Na2SeO3 and (NH4)2Ce(NO3)6 in the aqueous solution and characterized by elemental analysis, IR spectrum, UV spectrum, thermogravimetric analysis (TGA) and single-crystal X-ray diffraction. To the best of our knowledge, 1 stands for 1:2-type Dawson-like selenotungstate constructed from two identical [SeW17O59]12– moieties combined via one Ce4 + ion. The Ce4 + cation displays a distorted square prismatic geometry defined by eight oxygen atoms from two [SeW17O59]12– moieties. In the [Ce(SeW17O59)2]20– polyoxoanion, the {SeO3} trigonal pyramid encapsulated into the [SeW17O59]12– fragment is situated on the side close to the Ce4 + ion. The TGA curve of 1 reveals two steps of weight loss between 25 °C to 700 °C. Furthermore, the electrochemical and the eletrocatalytic properties of 1 have been measured by cyclic voltammetry (CV) in 0.5 M Na2SO4 + H2SO4 aqueous solution.
    No preview · Article · Mar 2015 · Inorganic Chemistry Communications
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    ABSTRACT: Three new metal-organic complexes Cu[Hbpdc](2) (1), [Ni(bpdc)(H2O)]center dot H2O (2) and [Ni(H(2)bpdc)(H2O)(2)] SO4 (3) (H(2)bpdc=2,2'-bipyridyl-5,5'-dicarboxylic acid) have been hydrothermally prepared and structurally characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. 1 is a 3-D supramolecular architecture formed by hydrogen bonding interactions between carboxyl O atoms and strong face-to-face pi center dot center dot center dot pi stacking interactions between bipyridyl rings of Hbpdc(-) ligands, 2 exhibits an intriguing 2-D sheet constructed from [Ni(bpdc)(H2O)1 units and 3 displays an infinite 1-0 chain built by {[Ni(H(2)bpdc)(H2O)(2)](2+)} fragments through SO42-. Moreover, thermogravimetric (TG) and derivative thermogravimetric (DTG) analyses of 3 have been conducted and the TG curve shows two-stage weight loss between 300 and 950 K and the corresponding apparent activation energies are calculated by Ozawa-Flynn-Wall (OFW) method and Friedman method. The most probable kinetic model function of the dehydration reaction of 3 has been estimated by Coats-Redfern integral method and Achar-Bridly-Sharp differential method.
    No preview · Article · Jan 2015 · Journal of Solid State Chemistry
  • Jie Luo · Xing Ma · Lijuan Chen · Junwei Zhao
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    ABSTRACT: A novel organic–inorganic hybrid independent 1-D double-chain silicotungstate [Cu(biim)2][Cu(4,4'-bpy)(biim) (H2O)][α-SiW12O40] · 3H2O (1, biim = 2,2'-biimidazole, 4,4'-bpy = 4,4'-dipyridine) has been successfully synthesized by reaction of Na10[A-α-SiW9O34] · 18H2O, CuCl2 · 2H2O, EuCl3, biim and 4,4'-bpy under 160 °C hydrothermal environment and characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. The most remarkable structural feature of 1 is that two types of independent 1-D chains are paralleling and one is constructed from plenary Keggin [α-SiW12O40]4– units and [Cu(biim)2]2 + linkers while the other is based on [Cu(biim)(H2O)]2 + cations and 4,4'-bpy connectors. The variable-temperature magnetic susceptibility of 1 shows the weak antiferromagnetic exchange interactions within CuII centers. Furthermore, the solid-state electrochemical properties of 1 have been also measured in 0.5 mol · L–1 Na2SO4 + H2SO4 aqueous solution by entrapping it in a carbon paste electrode.
    No preview · Article · Jan 2015 · Inorganic Chemistry Communications
  • Jie Luo · Hailou Li · Xinxin Chen · Jianru Ma · Lijuan Chen · Junwei Zhao

    No preview · Article · Jan 2015 · ChemInform
  • Wenbin Lu · Lijuan Chen · Yu Wang · Yuyu Yao · Cong Fu · Pengfei Zuo · Genshan Ma
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    ABSTRACT: Long-term oral anticoagulant treatment is obligatory in patients with atrial fibrillation (AF, score of CHA2DS2VASc ≥ 2). When these patients undergo percutaneous coronary intervention with a drug-eluting stent (PCI-eS), there is also an indication for aspirin and clopidogrel treatment, according to the ESC Guidelines. However, triple therapy has been known to increase the risk of bleeding complications. Unfortunately, there is little prospective data available to resolve this issue. Therefore, it is imperative that an optimal therapy for AF patients with indications of both anticoagulation and antiplatelet intervention to prevent thrombotic complications without increasing the risk of bleeding is found.
    No preview · Article · Dec 2014 · Contemporary Clinical Trials
  • Lili Ren · Lijuan Chen · Hui Qi · Furong Li · Feili Gong
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    ABSTRACT: Human adipose tissue-derived stem cells (hASCs) are considered an ideal tool for the supply of insulin-producing cells to treat diabetes mellitus, with high differentiation efficiency. Islet neogenesis-associated protein (INGAP) is an initiator of islet neogenesis, and the peptide sequence comprising amino acids 104-118, named INGAP pentadecapeptide (INGAP-PP), has been shown to increase β-cell mass in animals and human pathological states. Here, we report a novel 4-step method to promote hASCs to differentiate into islet-like clusters (ILCs) more efficiently by adding INGAP-PP. The hASCs were isolated, purified and differentiated using a 4-step protocol including trichostatin A, INGAP-PP/scrambled peptide (Scrambled-P), dexamethasone, nicotinamide, glucagon-like peptide-1, transforming growth factor β1 and exendin-4. Results showed that ILCs in the INGAP-PP group were more similar to the fresh islets with regard to both size and morphology and expressed significantly higher levels of both insulin and C-peptide than those in the Scrambled-P group. Moreover, the ILCs from the INGAP-PP group secreted higher levels of insulin and C-peptide than those from the Scrambled-P group in response to both a low (5.6 mM) and high (25 mM) glucose challenge and secreted 6 times more hormones under the high-glucose challenge. Real-time PCR and immunocytochemistry showed that ILCs of the INGAP-PP group expressed human pancreatic endocrine hormones and transcription factors. Transplantation of ILCs into diabetic rats partially reversed diabetes and prolonged their life span. In conclusion, the INGAP-PP protocol can efficiently induce hASCs to differentiate into ILCs in vitro, and thus hASCs could be a promising source of cells for transplantation to treat diabetes mellitus. © 2014 S. Karger AG, Basel.
    No preview · Article · Dec 2014 · Cells Tissues Organs

Publication Stats

804 Citations
207.56 Total Impact Points

Institutions

  • 2009-2015
    • Henan University
      • • Department of Chemical Engineering
      • • Institute of Molecular and Crystal Engineering
      K’ai-feng-shih, Henan Sheng, China
    • Keck Graduate Institute
      Клермонт, California, United States
  • 2007-2015
    • Southeast University (China)
      • Department of Cardiology
      Nan-ching-hsü, Jiangxi Sheng, China
  • 2014
    • Shenzhen Second People's Hospital
      Shen-ch’üan-shih, Zhejiang Sheng, China
  • 2012-2014
    • University of Cincinnati
      • Department of Internal Medicine
      Cincinnati, Ohio, United States
  • 2013
    • China Animal Disease Control Center
      Peping, Beijing, China
    • Chinese Academy of Sciences
      • Cold and Arid Regions Environmental and Engineering Research Institute
      Peping, Beijing, China