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Spatially Selective Nucleation of Metal Clusters on the Tobacco Mosaic Virus

机译：烟草花叶病毒上金属簇的空间选择性成核

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摘要

Tobacco mosaic virus (TMV) is a very stable nanotube complex of a helical RNA and 2130 coat proteins. The special shape makes it an interesting nano-object, especially as a template for chemical reactions. Here we use TMV as a chemically functionalized template for binding metal ions. Different chemical groups of the coat protein can be used as ligands or to electrostatically bind metal ions. Following this activation step, chemical reduction and electroless plating produces metal clusters of several nanometers in diameter. The clusters are attached to the virion without destroying its structure. Gold clusters generated from an ascorbic acid bath bind to the exterior surface as well as to the central channel of the hollow tube. Very high selectivity is reached by tuning Pd~(II) and Pt~(II) activations with phosphate: When TMV is first activated with Pd~(II), and thereafter metallized with a nickel-phosphinate bath, 3 nm nickel clusters grow in the central channel; when TMV from phosphate-buffered suspensions is employed, larger nickel clusters grow on the exterior surface. Phosphate buffers have to be avoided when 3 nm nickel and cobalt wires of several 100 nm in length are synthesized from borane-based baths inside the TMV channel. The results are discussed with respect to the inorganic complex chemistry of precursor molecules and the distribution of binding sites in TMV.
机译：烟草花叶病毒（TMV）是一种非常稳定的螺旋RNA和2130外壳蛋白的纳米管复合物。特殊的形状使其成为一个有趣的纳米物体，尤其是作为化学反应的模板。在这里，我们使用TMV作为结合金属离子的化学功能化模板。外壳蛋白的不同化学基团可用作配体或与金属离子静电结合。在该活化步骤之后，化学还原和化学镀产生直径为几纳米的金属簇。簇附着在病毒体上而不会破坏其结构。由抗坏血酸浴产生的金团簇结合到中空管的外表面以及中央通道。通过用磷酸盐调节Pd〜（II）和Pt〜（II）的活化可以达到非常高的选择性：当先用Pd〜（II）活化TMV，然后用次膦酸镍浴将其金属化时，会在其中生长3 nm的镍簇中央渠道；当使用磷酸盐缓冲悬浮液的TMV时，较大的镍簇会在外表面生长。从TMV通道内的硼烷基浴中合成长度为100 nm的3 nm镍和钴线时，必须避免使用磷酸盐缓冲剂。讨论了有关前体分子的无机络合物化学和TMV中结合位点的分布的结果。

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  • 来源
    《Advanced Functional Materials》 |2004年第2期|p. 116-124|共9页
  • 作者

    Mato Knez; Martin Sumser; Alexander M. Bittner; Christina Wege; Holger Jeske; T. Patrick Martin; Klaus Kern;

  • 作者单位

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

    Biologisches Institut, Department of Molecular Biology and Plant Virology, Universitat Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany;

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

    Biologisches Institut, Department of Molecular Biology and Plant Virology, Universitat Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany;

    Biologisches Institut, Department of Molecular Biology and Plant Virology, Universitat Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany;

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany;

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  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
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