Teeter Jacob D, Costa Paulo S, Dobner Christoph, Sarker Mamun, Sinitskii Alexander, Enders Axel
Department of Chemistry, University of Nebraska - Lincoln, 639N 12th Street, Lincoln, NE 68588, USA.
Department of Physics and Astronomy, University of Nebraska - Lincoln, 855N 16th Street, Lincoln, NE 68588, USA.
Chemphyschem. 2021 Sep 3;22(17):1769-1773. doi: 10.1002/cphc.202100049. Epub 2021 Jul 18.
The on-surface coupling of the prototypical precursor molecule for graphene nanoribbon synthesis, 6,11-dibromo-1,2,3,4-tetraphenyltriphenylene (C Br H , TPTP), and its non-brominated analog hexaphenylbenzene (C H , HPB), was investigated on coinage metal substrates as a function of thermal treatment. For HPB, which forms non-covalent 2D monolayers at room temperature, a thermally induced transition of the monolayer's structure could be achieved by moderate annealing, which is likely driven by π-bond formation. It is found that the dibrominated carbon positions of TPTP do not guide the coupling if the growth occurs on a substrate at temperatures that are sufficient to initiate C-H bond activation. Instead, similar one-dimensional molecular structures are obtained for both types of precursors, HPB and TPTP.
作为热处理的函数，在硬币金属基底上研究了用于石墨烯纳米带合成的典型前驱体分子6,11-二溴-1,2,3,4-四苯基三苯撑（C₃₆H₂₀Br₂，TPTP）及其非溴化类似物六苯基苯（C₃₆H₂₄，HPB）的表面耦合。对于在室温下形成非共价二维单层的HPB，通过适度退火可以实现单层结构的热诱导转变，这可能是由π键形成驱动的。研究发现，如果在足以引发C-H键活化的温度下在基底上生长，TPTP的二溴化碳位置不会引导耦合。相反，对于HPB和TPTP这两种类型的前驱体，都获得了类似的一维分子结构。
