On-surface synthesis of unsaturated carbon nanostructures with regularly fused pentagon-heptagon pairs

In this record we provide data to support our recent findings for the fabrication of Unsaturated Carbon Nanostructures with Regularly Fused Pentagon–Heptagon Pairs. Multiple fused pentagon–heptagon pairs are frequently found as defects at the grain boundaries of the hexagonal graphene lattice and are suggested to have a fundamental influence on graphene-related materials. However, the construction of sp2-carbon skeletons with multiple regularly fused pentagon–heptagon pairs is challenging. In this work, we found that the pentagon–heptagon skeleton of azulene was rearranged during the thermal reaction of an azulene-incorporated organometallic polymer on Au(111). The resulting sp2-carbon frameworks were characterized by high-resolution scanning probe microscopy techniques and feature novel polycyclic architectures composed of multiple regularly fused pentagon–heptagon pairs. Moreover, the calculated analysis of its aromaticity revealed a peculiar polar electronic structure.

在本记录中，我们提供了支持我们近期关于通过规律性融合五边形-七边形对制造不饱和碳纳米结构的研究发现的数据。多对融合的五边形-七边形在六角石墨烯晶格的晶界中常作为缺陷出现，并被认为是石墨烯相关材料的基本影响因素。然而，构建具有多个规律性融合五边形-七边形对的sp2碳骨架极具挑战性。在本研究中，我们发现，在含有噻吩蓝的有机金属聚合物在Au(111)表面的热反应过程中，噻吩蓝的五边形-七边形骨架发生了重排。所形成的sp2碳框架通过高分辨率扫描探针显微技术进行了表征，并具有由多个规律性融合的五边形-七边形对组成的创新性多环结构。此外，对其芳香性的计算分析揭示了其独特的极性电子结构。