Structural reconstruction and spontaneous formation of Fe polynuclears: a self-assembly of Fe-porphyrin coordination chains on Au(111) revealed by scanning tunneling microscopy.
Structural reconstruction and spontaneous formation of Fe polynuclears: a self-assembly of Fe-porphyrin coordination chains on Au(111) revealed by scanning tunneling microscopy.
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DOI：
10.1039/c6cp01836j
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
Yuxu Wang;K. Zhou;Ziliang Shi;Yu-qiang Ma
中科院分区：
文献类型：
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作者：
Yuxu Wang;K. Zhou;Ziliang Shi;Yu-qiang Ma
利用扫描隧道显微镜（STM）研究了铁卟啉在Au（111）表面的自组装配位链结构，揭示了由于分子取向的交替变化和均匀尺寸的铁多核的自发形成所导致的结构重构.的交替的分子取向归因于合作的吸引力的协调和分子间的空间位阻的高分辨率STM观测阐明。此外，进行化学控制实验，以确定在Fe多核的原子数，建议一个试探性的Fe双核模块，不仅作为一个协调中心，连接卟啉单元在一起，但也作为一个“悬空”的网站进一步功能化的客人三联吡啶配体。的链结构和Fe多核是稳定的，高达320 K的实时STM扫描显示。在较高温度下退火将链结构转化为二维配位结构。
A self-assembled Fe-porphyrin coordination chain structure on a Au(111) surface is investigated by scanning tunneling microscopy (STM), revealing structural reconstruction resulting from an alternative change of molecular orientations and spontaneous formation of uniformly sized Fe polynuclears. The alternation of the molecular orientations is ascribed to the cooperation of the attractive coordination and the intermolecular steric repulsion as elucidated by high-resolution STM observations. Furthermore, chemical control experiments are carried out to determine the number of atoms in an Fe polynuclear, suggesting a tentative Fe dinuclear-module that serves not only as a coordination center to link porphyrin units together but also as a "dangling" site for further functionalization by a guest terpyridine ligand. The chain structure and the Fe polynuclears are stable up to 320 K as revealed by real-time STM scanning. Annealing at higher temperatures converts the chain structure into a two-dimensional coordination structure.