Lixin Wu

Jilin University, Yung-chi, Jilin Sheng, China

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Publications (147)557.58 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A glucose-responsive porous polymer film which can be used for controlled insulin release was fabricated. By mixing polystyrene dichloromethane solution containing didodecylamine with water through shaking, a reverse microemulsion was achieved. After spreading of the microemulsion on glass slide and evaporating the solvent, an ordered honeycomb patterned film was produced accompanying by accumulation of didodecylamine within the inner surface of cavities. The patterned cavities were further successively modified with poly(acrylic acid), 3-aminophenylboronic acid, and alginate to catch insulin aggregates. The insulin aggregates prepared by salt out method were assembled into the cavities through electrostatic interaction with alginate. Under the stimulus of glucose, insulin aggregates released from the cavities and further calculations demonstrated the very high releasing efficiency. In contrast, in an aqueous solution without glucose, almost no insulin was checked releasing from the cavities. This investigation demonstrates that it is feasible for porous polymer films, whose cavities act as a protein reservoir, to be used as a glucose-responsive insulin delivery vehicle, which may have potential in controlled release drug delivery system for the treatment of diabetes.
    J. Mater. Chem. B. 12/2014;
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    ABSTRACT: Selective adhesion, growth promotion, proliferation inhibition and in situ transformation of Saccharomyces cerevisiae cells have been realized in a limited space of honeycomb-patterned polystyrene films prepared through a microemulsion method.
    Chemical communications (Cambridge, England). 11/2014;
  • Lixin Wu, Lei Shi, Bao Li
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    ABSTRACT: Inherent chiral polyoxometalate, while acting as stabilizer, is developed into inorganic chiral ligand for the synthesis of chiral metal nanoparticles, where the generated optical activity and stabilization are found to source from the strong interaction with polyoxometalate clusters.
    Chemical Communications 10/2014; · 6.38 Impact Factor
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    ABSTRACT: A quaternary ammonium surfactant (S) carrying a phenol terminal was grafted on the surface of nano-sized polyoxometalates, H4SiW12O40 (PM-1), K6P2W18O62 (PM-2) and Na10[Co4(H2O)2(VW9O34)2] (PM-3), respectively, by ionic self-assembly. The obtained complexes were connected with the poly(vinylpyridine) (P4VP) backbone via hydrogen bonds, resulting in the formation of nano-hybrid supramolecular polymers. Differential scanning calorimetry, polarized light microscopy, temperature-dependent X-ray diffraction, and transmission electron microscopy confirmed that the hybrid polymers containing PM-1 exhibited a thermotropic smectic C phase, where the alkyl chains of the surfactant are equally distributed on either side of PM-1 in a compact manner with only interfacial hydrogen bonding interactions between the phenol groups and the pyridine units of P4VP. Detailed investigation revealed that the liquid crystal properties are dependent on the molar ratio between PM-1 and P4VP, the molecular weight of P4VP and the charges of PMs. An increase of charge from 4 to 6 results in a loss of liquid crystal behaviour. Although the liquid crystal structure of the hybrid polymers is independent of the molecular weight of the P4VP backbone, the transition temperatures are strongly related to the change of the molecular weight of P4VP. The UV-vis and XPS measurements reveal that these hybrid liquid crystal polymers show reversible photochromic properties because of the multi-electronic redox activity of PM-1. The present article opens up a door for developing nano-hybrid liquid crystal polymers via a multi-step supramolecular self-assembly strategy, and provide an insight into understanding the nature and mechanisms of the influence of nano-objects on the self-assembly behaviour of hybrid polymers.
    RSC Advances 10/2014; 4(100). · 3.71 Impact Factor
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    ABSTRACT: Selective adhesion, growth promotion, proliferation inhibition and in-situ transformation of the Saccharomyces cerevisiae cells have been realized in the limited space of the honeycomb-patterned polymer films.
    Chemical Communications 10/2014; · 6.38 Impact Factor
  • Wen Li, Lixin Wu
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    ABSTRACT: The construction of nano-hybrid liquid crystals (LCs) has been intensively pursued because the unique traits of nano-objects together with the self-assembly features of LCs allow the development of novel anisotropic materials. Self-assembly of surfactant-encapsulated polyoxometalate (SEP) complexes, consisting of nano-sized cores and organic shells, provides particularly important contribution in this area. The main motivation for developing those nano-hybrid liquid crystals originates from the added-value combination between anionic polyoxometalates and cationic surfactants. This account describes recent work in our group to develop thermotropic SEP complexes that result from the sophisticated molecular design. Since the polyoxometalates possess well-defined topology, strictly mono-dispersed size, and precise surface charges, it is possible to get more insight into understanding of the influence of nature of components on the thermal property of nano-hybrid LCs. We briefly describe the general importance and advantage of nano-hybrid LCs. We then highlight the synthesis and characterization of thermotropic liquid crystals based on polyoxometalate nano-clusters. The driving forces behind the molecular self-assembly are discussed in depth. The various factors, including chain length, surfactant density and the size-matching effect, affecting the interfacial curvature and the LC properties are summarized. We expect that the structure-property relationships are virtually helpful for the design of new nano-hybrid LC materials.
    Chinese Journal of Chemistry 10/2014; · 0.92 Impact Factor
  • Haolong Li, Lixin Wu
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    ABSTRACT: The introduction of metal centers to supramolecular polymer system is an important approach to fabricate hybrid supramolecular polymers with synergistic properties between their inorganic and organic components, which is mainly realized through two strategies: one is the embedment of metal ions through metal-ligand coordination to form metallo-supramolecular polymers (MSPs); the other is using metal-containing clusters as hybrid building blocks to prepare clusto-supramolecular polymers (CSPs). The available paradigms of MSPs and CSPs not only exhibit the unique functions of metal centers but also hold the good processing ability and the stimuli-responsibility of dynamically bonded polymeric structures, thus representing a new class of hybrid soft materials. In this review, the development and recent progresses of MSPs and CSPs are discussed in detail, including their structure design, synthetic procedures and related properties. Finally, challenges and potential areas in metal-containing supramolecular polymers are outlooked.
    Soft Matter 09/2014; · 4.15 Impact Factor
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    ABSTRACT: A three-component supramolecular hybrid system based on host-guest recognition and electrostatic interaction has been developed for a consecutive chiral transfer from an alpha-cyclodextrin to cationic dyes via the bridge of a new azobenzene-grafted Anderson-type polyoxometalate cluster.
    Chemical Communications 08/2014; · 6.38 Impact Factor
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    ABSTRACT: The block copolymers (BCs), as structure-directing agents, co-assembling with nanoscale inorganic additives is an important route to fabricate nanostructured hybrid materials. In this work, we present a facile approach to fabricate hybrid micelles composed of BCs and polyoxometalates (POMs), in which the POM clusters are premodified with the groups that can specifically interact with a certain BC block. A representative POM (NH4)42[Mo132O372(CH3COO)30(H2O)72] (Mo132) is chosen as the example and encapsulated with cationic molecules containing carboxyphenyl groups through electrostatic interactions, and then the resulting hybrid complex can further co-assemble with poly(styrene-block-4-vinylpyridine) (PS-b-P4VP) through hydrogen bonding with the pyridine groups, which leads to the formation of hybrid micelles and the localization of Mo132 in the micelle cores. The micelles exhibit a high stability despite time and dilution. Furthermore, the fusion of the micelles can be readily adjusted by varying the length of PS blocks, which is promising to be used in constructing polymer-POM hybrid materials with discrete or continuous hybrid domains. This work is based on the electrostatic premodification of POMs and thus its concept is generally suitable for the whole anionic POM system, which may create a large class of BC-POM nanocomposites with tunable structures.
    Soft Matter 07/2014; · 4.15 Impact Factor
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    ABSTRACT: Surfactant-encapsulated polyoxometalate complexes are used as cluster suprasurfactants to transfer reduced graphene oxide (RGO) nanosheets from water to low polar organic solvents, which realizes the single-layer dispersion and the cluster-functionalization of RGO in one step.
    Chemical Communications 07/2014; · 6.38 Impact Factor
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    ABSTRACT: To explore the principle of chiral induction in inorganic clusters, chiral organic cations with two stereocenters, R- and S-BPEA, are used to encapsulate a series of polyoxometalates (POMs) bearing different structures and transition absorption bands in aqueous solution, constructing a series of chiral supramolecular complexes. Due to the induction of chiral organic cations, POMs possessing both chiral and achiral structures show an induced circular dichroism (ICD) effect. ICD signals in the absorption bands corresponding to ligand to metal charge transfer (LMCT) transitions, d-d transitions and intervalence charge transfer (IVCT) transitions are observed for different complexes. Moreover, the ICD of the POMs exhibits a direct correlation with the degree of POM distortion and the distance between the chiral center and the POM surface. The encapsulation of POMs with chiral organic cations via electrostatic interactions provides a facile and effective method for constructing optically pure POM-based materials.
    Dalton Transactions 05/2014; · 4.10 Impact Factor
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    ABSTRACT: A europium-substituted polyoxometalate (K13[Eu(SiW10MoO39)2]⋅28 H2O, EuSiWMo) can selectively bind to basic amino acids, namely, lysine, arginine, and histidine, and induce the emission enhancement of Eu3+ significantly. The mechanism is attributed to electrostatic interactions and hydrogen bonds between basic residues of the amino acids and negative charges of EuSiWMo based on the 1H NMR titration spectra of amino acids and time-resolved fluorescence decay curves of EuSiWMo.
    ChemPlusChem 05/2014;
  • Hui Ai, Yang Wang, Bao Li, Lixin Wu
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    ABSTRACT: Five single-side organic decorated Anderson-type molybdoaluminates have been synthesized from the reaction of the Na3(H2O)6[Al(OH)6Mo6O18]·2H2O cluster and RC(CH2OH)3 ligands [R = CH2OH, NH2, CH2CH3, NHCH2COOH, CH2OCH2C(CH2OH)3], followed by the addition of TBA·Br {TBA = [N(C4H9)4]+}. The prepared compounds possess an identical Anderson-type structural frame in each case, wherein three of the six hydroxy groups surrounding the AlIII heteroatom are substituted by one RC(CH2OH)3 group, forming asymmetric single-sided organically decorated clusters. The compounds demonstrate the simplest synthesis of covalent organic decoration for the single-sides of molybdoaluminates. All the prepared compounds in the present study were synthesized in aqueous solution and characterized by elemental and TG analysis, IR and 1H NMR spectroscopy, and single-crystal X-ray diffraction analysis. In addition, the supramolecular structures of these compounds based on the hydrogen bonding have also been discussed. The method reported here provides a common approach for the asymmetric functionalization of Anderson-type molybdoaluminates.
    Berichte der deutschen chemischen Gesellschaft 05/2014; · 2.94 Impact Factor
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    ABSTRACT: In this study, three hybrid films {[(PEI/P5W30)m/(PEI/PSS/PEI/GO@F)]n(PEI/P5W30)m} (m = 1, 3, 5; n = 15, 17, 18) (P5W30: [P5W30O110]15−; GO: graphene oxide; F: fluorescein) with green fluorescence have been successfully fabricated through a suitable structural design and alternate assembly of selected components. The fluorescence of the hybrid films can be reversibly switched by the electrochromism of the P5W30 component upon electrochemical modulation while the hybrid films display structural stability against the electrochemical process.
    J. Mater. Chem. C. 05/2014; 2(22).
  • Lei Shi, Yizhan Wang, Bao Li, Lixin Wu
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    ABSTRACT: In this paper, the chiral surfactants bearing two long alkyl chains with hydroxyl groups at their terminals were synthesized and employed to encapsulate a catalytically efficient polyoxometalate through electrostatic interaction. The obtained chiral surfactant-encapsulated polyoxometalate complexes, in which a defined chiral microenvironment surrounds the inorganic cluster, were covalently immobilized into the silica matrix via a sol-gel process. Kinetic resolution of racemic aromatic alcohols was selected as the model reaction to evaluate the chiral supramolecular hybrid catalysts. Up to 89% enantiomeric excess was obtained by varying the reaction conditions. Importantly, the change of loading values of the chiral surfactant-encapsulated polyoxometalates leads to mutative inner microstructures ranging from uniform dispersion to subsequent formation of nanocrystalline domains in the silica matrix. Such a structural evolution differentiates the density and stability of the chiral microenvironment, resulting in a regular change of enantioselectivity of the prepared asymmetric catalysts. Moreover, the fixation of the chiral microenvironment surrounding the polyoxometalates by covalent immobilization was proved to have a promoting effect on enantioselectivity. The present research uncovers the unique effect of immobilization on the kinetic resolution. The strategy helps to understand the influencing factors of enantioselectivity, and provides a convenient and efficient approach for the construction of supramolecular asymmetric catalysts based on chiral surfactant-encapsulated polyoxometalate complexes.
    Dalton Transactions 05/2014; · 4.10 Impact Factor
  • Wen Li, Lixin Wu
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    ABSTRACT: Supramolecular liquid crystals containing inorganic nanoclusters represent a promising avenue in the field of liquid crystals. The main motivation for developing those hybrid materials originates from the value-added combination between functional properties of inorganic nano-objects and the self-assembly behavior of organic LC molecules. This review highlights the recent progress regarding the nanocluster-contained supramolecular liquid crystals. Important factors affecting the liquid crystalline behaviors are systematically described and summarized. The driving forces behind the molecular self-assembly are discussed in depth. Finally, potential applications of the liquid-crystalline nanohybrids are prospected.
    Polymer International 03/2014; · 2.13 Impact Factor
  • Dan Li, Haolong Li, Lixin Wu
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    ABSTRACT: A series of hybrid supramolecular star polymers (SSPs) consisting of a polyoxometalate EuW10O369− (EuW10) core and different length of polystyrene arms have been fabricated by a “core-first” method, in which the anionic EuW10 clusters were firstly encapsulated by cationic molecules with trithioester terminal groups and subsequently polystyrene arms were grafted by reversible addition–fragmentation chain-transfer (RAFT) polymerization. The SSPs exhibit structurally dependent self-assembly behaviours in solution, at the air–water interface and solid state. It was found that the SSPs with short arms form large assemblies with a diameter over 100 nm in chloroform, while those with long arms tend to be mono-dispersed. Meanwhile, the distance between the EuW10 cores of adjacent SSPs in Langmuir monolayers and casting films can be precisely adjusted by PS arms, which leads to a tunable colour purity of EuW10 luminescence. This tight structure–property relationship enables the polyoxometalate-cored SSPs to act as potential building blocks for the construction of hybrid polymer materials with controllable functions.
    Polym. Chem. 02/2014; 5(6).
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    ABSTRACT: Two series of Bodipy-containing photochromic spirooxazine and spiropyran derivatives have been designed, synthesized and characterized by (1)H NMR, ESI mass spectrometry and elemental analysis. Their electrochemical and photochromic properties were investigated. The photophysical, ultrafast transient absorption, and fluorescence resonance energy transfer (FRET) properties from Bodipy (donor) to the ring-opened merocyanine (acceptor) were also studied. Upon photoexcitation, all the photochromic spirooxazine- and spiropyran-containing compounds exhibited reversible photochromism. Computational studies have been performed to provide further insights into the nature of the electronic transitions for the two classes of compounds. The rate constants and activation parameters for thermal bleaching reactions of compounds SO, SP-alkyne, 1-3, and 8-10 were determined through kinetic studies in acetonitrile. The thermal bleaching reaction rate of the spiropyran-containing compounds is found to be much slower than that of the spirooxazine-containing counterparts.
    ACS Applied Materials & Interfaces 01/2014; · 5.90 Impact Factor
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    ABSTRACT: A smart core-shell complex is designed to combine the catalytic reaction and the automatic separation through remote light control. Here, we present the induced amphiphilic behavior of a surfactant-encapsulated polyoxometalate complex with photo-responsive azobenzene units on the periphery. The reversible phase transfer of the complex shuttle between two incompatible phase termini, which is driven by the photoisomerization-induced polarity change, further facilitates the separation and recycle of the catalyst.
    Journal of the American Chemical Society 09/2013; · 10.68 Impact Factor
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    ABSTRACT: Supramolecular assembly: Spherical and stable hybrid assemblies based on a cationic polymer with spermine side chains and an anionic Gd(3+) -containing polyoxometalate cluster (GdW) are prepared by electrostatic interaction. The T1 -weighted MRI performance of GdW is enhanced about three times in the assemblies; meanwhile, the assemblies show good biocompatibility, which enables them to be promising candidates for MRI contrast agents.
    Chemistry - A European Journal 09/2013; · 5.93 Impact Factor

Publication Stats

527 Citations
557.58 Total Impact Points

Institutions

  • 2001–2014
    • Jilin University
      • • State Key Laboratory of Supramolecular Structure and Materials
      • • College of Chemistry
      Yung-chi, Jilin Sheng, China
    • University of Münster
      • Institut für Physikalische Chemie
      Münster, North Rhine-Westphalia, Germany
  • 2011–2013
    • Northeast Normal University
      • Department of Chemistry
      Hsin-ching, Jilin Sheng, China