Structure Formation in Bis(terpyridine) Derivative Adlayers: Molecule-Substrate versus Molecule-Molecule Interactions

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• 作者：Harry E. Hoster ; Matthias Roos ; Achim Breitruck ; Christoph Meier ; Katrin Tonigold ; Thomas Waldmann ; Ulrich Ziener ; Katharina Landfester ; R. Jü ; rgen Behm
• 刊名：Langmuir
• 出版年：2007
• 出版时间：November 6, 2007
• 年：2007
• 卷：23
• 期：23
• 页码：11570 - 11579
• 全文大小：1592K
• 年卷期：v.23,no.23(November 6, 2007)
• ISSN：1520-5827

文摘

The influence of the substrate and the deposition conditions-vapor deposition versus deposition from solution-onthe structures formed upon self-assembly of deposited bis(terpyridine) derivative (2,4'-BTP) monolayers on differenthexagonal substrates, including highly oriented pyrolytic graphite (HOPG), Au(111), and (111)-oriented Ag thin films,was investigated by high-resolution scanning tunneling microscopy and by model calculations of the intermolecularenergies and the lateral corrugation of the substrate-adsorbate interaction. Similar quasi-quadratic network structureswith almost the same lattice constants obtained on all substrates are essentially identical to the optimum configurationexpected from an optimization of the adlayer structure with C-H···N-type bridging bonds as a structure-determiningfactor, which underlines a key role of the intermolecular interactions in adlayer order. Slight distortions from theoptimum values to form commensurate adlayer structures on the metal substrates and the preferential orientation ofthe adlayer with respect to the substrate are attributed to the substrate-adsorbate interactions, specifically, the lateralcorrugation in the substrate-adsorbate interaction upon lateral displacement and rotation of the adsorbed BTP molecules.The fact that similar adlayer structures are obtained on HOPG under ultrahigh vacuum conditions (solidgas interface)and on HOPG in trichlorobenzene (solidliquid interface) indicates that the intermolecular interactions are not severelyaffected by the solvent.