Analysis of metallo-supramolecular systems using single-molecule force spectroscopy
Analysis of metallo-supramolecular systems using single-molecule force spectroscopy
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DOI：
10.1002/adfm.200304359
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发表时间：
2003-08-01
影响因子：
19
通讯作者：
Schubert, US
中科院分区：
文献类型：
--
作者：
Kudera, M;Eschbaumer, C;Schubert, US
单分子力谱已被用于研究单个金属-超分子体系的断裂行为。为此，专门设计的不对称的α，ω-官能化的聚（环氧乙烷）已被用于单终止与三联吡啶配体，并随后用于附着到原子力显微镜（AFM）的提示和显微镜载玻片基板。通过使用钌（III）-钌（II）化学形成金属-超分子络合物。AFM悬臂梁的垂直拉伸破坏了配位键。单个双三联吡啶钌（II）配合物的断裂力被确定为95 pN在1 nN s（-1）的力加载速率。同时断裂的多个平行的金属超分子键也被观察到。蒙特卡洛模拟证实了实验观察。研究结果为金属-超分子体系在纳米功能材料中的应用奠定了基础。
Single-molecule force spectroscopy has been used for the investigation of the rupture behavior of individual metallo-supramolecular systems. For this purpose, a specifically designed unsymmetrical alpha,omega-functionalized poly(ethylene oxide) has been employed for mono-termination with a terpyridine ligand and subsequently for the attachment onto atomic force microscopy (AFM) tips and microscope slide substrates. Metallo-supramolecular complexes were formed by the use of ruthenium(III)-ruthenium(II) chemistry. Vertical stretching with the AFM cantilever ruptured the coordinative bonds. The rupture force of individual bisterpyridine ruthenium(II) complexes was determined to be 95 pN at a force loading rate of 1 nN s(-1). Simultaneous rupturing of multiple parallel metallo-supramolecular bonds was also observed. Monte Carlo simulations corroborated the experimental observations. The presented results lay the basis for the application of such metallo-supramolecular systems in advanced functional nanomaterials.