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Deposition of Functionalized Cr_7Ni Molecular Rings on Graphite from the Liquid Phase

机译：从液相沉积功能化Cr_7Ni分子环在石墨上

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摘要

Graphite is a clean substrate and its nanostructures hold great potential for applications. Anchoring large molecules on graphite represents a challenge for several reasons that essentially rise from the planar bonds of the packed honeycomb structure of carbon. Here, a systematic investigation by AFM and XPS on different derivatives of molecular Cr_7Ni rings deposited on highly oriented pyrolytic graphite (HOPG) is reported. Cr_7Ni is emerging as a prototipical example of molecular antiferromagnet on which quantum phenomena and coherence have been demonstrated. For the deposition of Cr_7Ni on HOPG, two strategies are adopted: 1) Cr_7Ni rings are functionalized with extended alkyl/benzene terminations and 2) a self-assembled monolayer of alkyl chains with sulfonate terminations is deposited and then a cationic Cr_7Ni derivative is used. In both cases the electronic bond with the carbon surface is soft, but the two-step procedure is efficient, albeit indirect, in sticking molecular Cr_7Ni on HOPG. These strategies can be easily extended to deposit other complex molecular aggregates on graphite from the liquid phase.
机译：石墨是一种清洁的基材，其纳米结构具有广阔的应用前景。在石墨上锚固大分子代表了一项挑战，其原因有很多，这些原因主要来自于碳的填充蜂窝状结构的平面键。在此，通过AFM和XPS对沉积在高度取向的热解石墨（HOPG）上的分子Cr_7Ni环的不同衍生物进行了系统研究。 Cr_7Ni逐渐成为分子反铁磁体的典型例子，在该反铁磁体上已证明了量子现象和相干性。对于在HOPG上沉积Cr_7Ni，采用两种策略：1）用扩展的烷基/苯端基官能化Cr_7Ni环; 2）沉积具有磺酸盐端基的烷基链的自组装单层，然后使用阳离子Cr_7Ni衍生物。在这两种情况下，与碳表面的电子键都是柔软的，但是，尽管是间接的，但两步程序仍然有效，可以将分子Cr_7Ni粘附在HOPG上。这些策略可以轻松扩展，以将其他复杂的分子聚集体从液相沉积到石墨上。

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  • 来源
    《Advanced Functional Materials》 |2010年第10期|P.1552-1560|共9页
  • 作者

    Alberto Ghirri; Valdis Cormdini; Christian Cervetti; Andrea Candini; Umberto del Pennino; Grigore Timco; Robin J. Pritchard; Christopher A. Muryn; Richard E. P. Win penny; Marco Affronte;

  • 作者单位

    CNR-Institute of NanoSciences S3 via Campi 213/a, 41100 Modena (Italy);

    rnCNR-Institute of NanoSciences S3 via Campi 213/a, 41100 Modena (Italy);

    rnCNR-Institute of NanoSciences S3 and Dipartimento di Fisica Universita di Modena e Reggio Emilia via Campi 213/a, 41100 Modena (Italy);

    rnCNR-Institute of NanoSciences S3 via Campi 213/a, 41100 Modena (Italy);

    rnCNR-Institute of NanoSciences S3 and Dipartimento di Fisica Universita di Modena e Reggio Emilia via Campi 213/a, 41100 Modena (Italy);

    rnThe Lewis Magnetism Laboratory School of Chemistry, The University of Manchester Oxford Road, Manchester M139PL (UK);

    rnThe Lewis Magnetism Laboratory School of Chemistry, The University of Manchester Oxford Road, Manchester M139PL (UK);

    rnThe Lewis Magnetism Laboratory School of Chemistry, The University of Manchester Oxford Road, Manchester M139PL (UK);

    rnThe Lewis Magnetism Laboratory School of Chemistry, The University of Manchester Oxford Road, Manchester M139PL (UK);

    rnCNR-Institute of NanoSciences S3 and Dipartimento di Fisica Universita di Modena e Reggio Emilia via Campi 213/a, 41100 Modena (Italy);

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