X. Ru

Nanchang University, Nan-ch’ang-shih, Jiangxi Sheng, China

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Publications (5)11.06 Total impact

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    ABSTRACT: Three polymers functionalised with diiron carbonyl units, PVC-Fe-A, -B, and -C, were prepared using commercially available polymer PVC (polyvinyl chloride). PVC-Fe-A resulted from the reaction of the reduced form of a diiron complex, [Fe(2)(mu-S)(2)(CO)(6)], with PVC, whereas PVC-Fe-B and PVC-Fe-C were, respectively, prepared by reacting PVC-N(3), the polymer functionalised with azide groups by substitution of the chloride of the polymer, with two diiron complexes, [Fe(2)(mu-SCH(2)C=CH)(CO)(6)] (1) and [Fe(2)(mu-S(n)But)(mu-SCH(2)C=CH)(CO)(6)] (2, (n)But = -CH(2)CH(2)CH(2)CH(3)), via "click chemistry'' under the catalysis of CuI. Those polymers were characterised using infrared spectroscopy (IR), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA). Film electrodes were assembled using a spin-coating technique by casting a mixture of the functionalised polymer, MWCNTs (multi-wall carbon nanotubes), and Nafion onto the surface of a vitreous carbon electrode. The assembled electrodes exhibited electrochemical responses and catalysis on proton reduction in a medium of acetonitrile-acetic acid with a positive shift in reduction potential by over 400 mV compared to the precursor diiron complexes (1 and 2).
    RSC Advances 11/2011; 1(7):1211-1219. · 3.71 Impact Factor
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    ABSTRACT: A diiron hexacarbonyl complex possessing an alkynyl group as a model complex of the diiron sub-unit of [FeFe]-hydrogenase was polymerized under the catalysis of WCl(6)-SnPh(4). The polymer (Poly-{Fe(2)}) functionalized with {Fe(2)(CO)(6)} units which is dominated by cis-form was fully characterised using FTIR, NMR, SEM, TEM, and TGA techniques. Through modifying the monomer, the properties, for example, solubility, of the resultant polymer could be tuned and much larger molecule weight, which was estimated as 7.93 x 10(5) g mol(-1) using static light scattering technique was achieved without compromising its solubility. Spin-coating the functionalized polymer onto the surface of vitreous carbon electrode with or without multi-wall carbon nanotubes (MWCNTs) produced film electrodes which show electrochemical responses. Adding MWCNTs into the film enhances significantly the electrochemical response probably via not only improving the conductivity of the film, but also the increase in its effective surface area after being doped with MWCNTs. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
    International Journal of Hydrogen Energy. 01/2011; 36(16):9612-9619.
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    ABSTRACT: By using "click" chemistry between a diazide and a diiron model complex armed with two alkynyl groups, two polymeric diiron complexes (Poly-Py and Poly-Ph) were prepared. The two polymeric complexes were investigated using infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), Mössbauer spectroscopy, and cyclic voltammetry (Poly-Py only, due to the insolubility of Poly-Ph). To probe the coordinating mode of the diiron units in the two polymeric complexes, two control complexes (3 and 4) were also synthesised using a monoazide. Complexes 3 and 4 were well characterised and the latter was further crystallographically analysed. It turns out that in both complexes (3 and 4) and the two polymeric diiron complexes, one of the two iron atoms in the diiron unit coordinates with one of the triazole N atoms. Our results revealed that both morphologies and properties of Poly-Py and Poly-Ph are significantly affected by the organic moiety of the diazide. Compared to the protonating behaviour of the complexes 3 and 4, Poly-Py exhibited proton resistance. In electrochemical reduction, potentials for the reduction of the diiron units in Poly-Py and hence its catalytic reduction of proton in acetic acid-DMF shifted by over 400 mV compared to those for complexes 3 and 4. It is likely that the polymeric nature of Poly-Py offers the diiron units a "protective" environment in an acidic medium and more positive reduction potential.
    Dalton Transactions 10/2010; 39(46):11255-62. · 3.81 Impact Factor
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    ABSTRACT: A complex pendant with two ethynyl groups, [Fe(2)(mu-SCH(2)CCH)(2)(CO)(6)] (2), as a model of the diiron subunit of [FeFe]-hydrogenase was polymerized and the {Fe(2)(CO)(6)} core was successfully incorporated into the polymer matrix. The polymer was characterized by a variety of spectroscopic techniques, TGA, FTIR, SEM, TEM, and NMR. The resultant polymer was immobilized via "click" chemistry using its terminal C CH bond onto the surface of a gold electrode, which was premodified with azidothiol by self-assembled monolayer (SAM). The assembled electrode showed electrochemical responses. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2410-2417,2010
    Journal of Polymer Science Part A Polymer Chemistry 01/2010; 48(11):2410-2417. · 3.54 Impact Factor
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    ABSTRACT: The reaction of a tetradentate ligand, 2,2'-(pyridin-2-ylmethylazanediyl)diethanethiol (H(2)L), with dodecacarbonyltriiron in dry toluene leads to the formations of a hexacarbonyl complex, [Fe(2)(EDT)(CO)(6)] (EDT = ethylenedithiolate), 1a, which is fully characterised. The formation of this complex is via intramolecular C-S/N bonds formation/cleavage promoted by iron-sulfur coordination chemistry. A possible mechanism for the C-S/N bonds formation/cleavage in the formation of the complex is proposed. (C) 2008 Elsevier B.V. All rights reserved.
    Inorganica Chimica Acta. 01/2009; 362(6):2065-2067.