The coordination reactions of 5-(2-(4-bromophenyl)ethynyl)pyrimidine (PEPmBr) molecules on Ag(111) was studied by low-temperature scanning tunneling microscopy (LT-STM). First, vapor deposition of PEPmBr molecules onto Ag(111) at room temperature leads to the formation of a large-scale pinwheel-like self-assembly structure. Then hierarchical coordination reactions were employed to synthesize organometallic dimers and tetramers on Ag(111) surface. In contrast to the releasing of the coordinated Ag atoms and forming covalent bonds, it is found herein that further thermal activation induces the rotation of the C–Ag–C and N–Ag–N coordination bonds, resulting in various organometallic nanoteris with triangle, rectangle, and zigzag structures.

中文翻译：

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5-（2-（4-溴苯基）乙炔基）嘧啶在表面合成中的配位反应

通过低温扫描隧道显微镜（LT-STM）研究了5-（2-（4-溴苯基）乙炔基）嘧啶（PEPmBr）分子在Ag（111）上的配位反应。首先，在室温下将PEPmBr分子气相沉积到Ag（111）上导致形成大规模的风车状自组装结构。然后采用分级配位反应在Ag（111）表面合成有机金属二聚体和四聚体。与释放配位的Ag原子并形成共价键相反，本文发现进一步的热活化会引起C–Ag–C和N–Ag–N配位键的旋转，从而产生各种带有三角形的有机金属纳米级，矩形和锯齿形的结构。