Department of Chemistry, Philipps-Universität Marburg, 35032 Marburg, Germany.
Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.
Science. 2021 May 21;372(6544):852-856. doi: 10.1126/science.abg4509.
The quest for planar sp-hybridized carbon allotropes other than graphene, such as graphenylene and biphenylene networks, has stimulated substantial research efforts because of the materials' predicted mechanical, electronic, and transport properties. However, their syntheses remain challenging given the lack of reliable protocols for generating nonhexagonal rings during the in-plane tiling of carbon atoms. We report the bottom-up growth of an ultraflat biphenylene network with periodically arranged four-, six-, and eight-membered rings of sp-hybridized carbon atoms through an on-surface interpolymer dehydrofluorination (HF-zipping) reaction. The characterization of this biphenylene network by scanning probe methods reveals that it is metallic rather than a dielectric. We expect the interpolymer HF-zipping method to complement the toolbox for the synthesis of other nonbenzenoid carbon allotropes.
人们一直在探索除石墨烯以外的平面 sp 杂化碳同素异形体,例如并苯烯和联苯网络,因为这些材料具有预测的机械、电子和输运性能,所以引起了大量的研究兴趣。然而,由于缺乏在平面碳原子堆积过程中生成非六边形环的可靠方案,其合成仍然具有挑战性。我们报告了通过表面上的聚合体间脱氢氟化(HF-zipping)反应,自下而上生长具有周期性排列的 sp 杂化碳原子的四、六和八元环的超平面联苯烯网络。通过扫描探针方法对该联苯烯网络的特性进行了表征,发现它是金属的而不是介电的。我们期望聚合体间 HF-zipping 方法能够补充其他非苯碳同素异形体合成的工具包。