Au(111)表面(非)共面配体-吡啶与Fe配位形成自组装网络结构

Assembling Pyridyl-Fe Coordination Networks Using Planar/nonplanar Ligands on Au(111)

选用4个吡啶端基共面与非共面的两种分子(分子I:5,10,15,20-四(4-吡啶基)卟啉;分子II:四(4-(4-吡啶基)苯基)甲烷)分别与Fe配位,在Au(111)表面成功自组装形成二维配位网格结构,并探究了二维受限环境对非平面分子自组装的影响.超高真空扫描隧道显微镜实验发现,分子I主要通过Fe原子四配位形成正方形结构;分子II主要通过Fe原子三配位形成蜂窝状结构;对比发现非共面的吡啶端基除与Fe配位形成二维网络结构外,其余的吡啶端基可能成为进一步修饰Fe原子的模板,实现了表面配位结构的功能性.

Two types of pyridine-Fe coordination networks have been fabricated on Au（ 111） surface,in which organic ligandⅠ（ 5,10,15,20-tetra（ 4-pyridyl） porphyrin） and molecule II（ tetrakis（ 4-（ pyridin-4-yl）phenyl） methane） with planar / nonplanar steric conformation are employed separately. The influence of surface-confinement on the assembly from nonplanar organic components is investigated. Ultra-high vacuum scanning tunneling microscopy（ UHV-STM） has revealed that molecule I are mainly arranged into square structure by four coordinating sites of Fe atom,while molecule II mainly formed into honeycomb structure by three coordinating sites of Fe atom in the experiments. Besides part of nonplanar pyridine end groups formed 2D framworks structure duing to 2D confined condition by comparison,while other pyridine end groups maybe the template for modifying of Fe atom to reach the functional surface coordinating structure.