Composite Molecular Assemblies: Nanoscale Structural Control and Spectroelectrochemical Diversity

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• 作者：Graham de Ruiter ; Michal Lahav ; Guennadi Evmenenko ; Pulak Dutta ; Domenico A. Cristaldi ; Antonino Gulino ; Milko E. van der Boom
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：November 6, 2013
• 年：2013
• 卷：135
• 期：44
• 页码：16533-16544
• 全文大小：655K
• 年卷期：v.135,no.44(November 6, 2013)
• ISSN：1520-5126

文摘

The controlled deposition of metal complexes from solution on inorganic surfaces offers access to functional materials that otherwise would be elusive. For such surface-confined interfaces to form, specific assembly sequences are often used. We show here that varying the assembly sequence of two well-defined and iso-structural osmium and ruthenium polypyridyl complexes results in interfaces with strikingly different spectroelectrochemical properties. Successive deposition of redox-active layers of osmium and ruthenium polypyridyl complexes, leads to self-propagating molecular assemblies (SPMAs) with distinct internal interfaces and individually addressable components. In contrast, the clear separation of these interfaces upon sequential deposition of these two complexes, results in charge trapping or electrochemical communication between the metal centers, as a function of layer thickness and applied assembly sequence. The SPMAs were characterized using a variety of techniques, including: UV鈥搗is spectroscopy, spectroscopic ellipsometry, electrochemistry, synchrotron X-ray reflectivity, angle-resolved X-ray photoelectron spectroscopy, and spectroelectrochemistry. The combined data demonstrate that the sequence-dependent assembly is a decisive factor that influences and provides the material properties that are difficult to obtain otherwise.