Supramolecular ‘flat’ Mn<sub>9</sub>grid complexes—towards functional molecular platforms
作者:Victoria A. Milway、S. M. Tareque Abedin、Virginie Niel、Timothy L. Kelly、Louise N. Dawe、Subrata K. Dey、David W. Thompson、David O. Miller、Mohammad Sahabul Alam、Paul Müller、Laurence K. Thompson
DOI:10.1039/b515801j
日期:——
Flat, quantum dot like arrays of closely spaced, electron rich metal centres are seen as attractive subunits for device capability at the molecular level. Mn(II)9 grids, formed by self-assembly processes using âtritopicâ pyridine-2,6-dihydrazone ligands, provide easy and pre-programmable routes to such systems, and have been shown to exhibit a number of potentially useful physical properties, which could be utilized to generate bi-stable molecular based states. Their ability to form surface monolayers, which can be mapped by STM techniques, bodes well for their possible integration into nanometer scale electronic components of the future. This report highlights some new Mn(II)9 grids, with functionalized ligand sites, that may provide suitable anchor points to surfaces and also be potential donor sites capable of further grid elaboration. Structures, magnetic properties, electrochemical properties, surface studies on HOPG (highly ordered pyrolytic graphite), including the imaging of individual metal ion sites in the grid using CITS (current imaging tunneling spectroscopy) are discussed, in addition to an analysis of the photophysics of a stable mixed oxidation state [Mn(III)4Mn(II)5] grid. The grid physical properties as a whole are assessed in the light of reasonable approaches to the use of such molecules as nanometer scale devices.
平坦的、类似量子点的紧密排列富电子金属中心的阵列被视为在分子层面上具有吸引力的子单元,用于设备的功能性。由自组装过程形成的 Mn(II)9 网格,采用“多位”吡啶-2,6-二氢肼酮配体,提供了通向此类系统的简便且可预编程的途径,并已显示出多种潜在有用的物理特性,这些特性可以用于产生双稳态分子基态。它们形成表面单层的能力,可以通过 STM 技术进行绘制,为其在未来纳米级电子元件中的可能集成打下了良好基础。本报告重点介绍一些新型的 Mn(II)9 网格,具有功能化的配体位点,可能为表面提供合适的锚点,并且也可能是能够进一步扩展网格的潜在供体位点。讨论了结构、磁性、 electrochemical 性质、对高有序热解石墨(HOPG)的表面研究,包括使用电流成像隧道光谱(CITS)成像网格中单个金属离子位点,此外还分析了稳定的混合氧化状态 [Mn(III)4Mn(II)5] 网格的光物理学。综合评估网格的物理特性,以合理的方式探讨将此类分子用作纳米级设备的可能性。