一种sp-杂化的分子碳同素异形体，环[18]碳
An sp-hybridized molecular carbon allotrope, cyclo[18]carbon
摘要：
碳同素异形体由两个配位原子的环组成，称为环[n]碳，多年来一直吸引着化学家，但直到现在，由于它们的高反应性，它们还不能被分离或结构表征。我们在5开尔文温度下，通过消除环碳氧化物分子C24 O 6中的一氧化碳，在Cu（111）上的双层NaCl上进行原子操作，生成了环[18]碳（C18）。通过高分辨率原子力显微镜对环[18]碳的表征揭示了具有交替的三键和单键的定义位置的多炔结构。环碳和环碳氧化物的高反应性允许通过原子操纵诱导分子之间的共价偶联，从而为从环碳分子的聚结合成其他碳同素异形体和富碳材料开辟了途径。
英文摘要：
Carbon allotropes built from rings of two-coordinate atoms, known as cyclo[n]carbons, have fascinated chemists for many years, but until now they could not be isolated or structurally characterized, due to their high reactivity. We generated cyclo[18]carbon (C18) using atom manipulation on bilayer NaCl on Cu(111) at 5 Kelvin by eliminating carbon monoxide from a cyclocarbon oxide molecule C24O6. Characterization of cyclo[18]carbon by high-resolution atomic force microscopy revealed a polyynic structure with defined positions of alternating triple and single bonds. The high reactivity of cyclocarbon and cyclocarbon oxides allows covalent coupling between molecules to be induced by atom manipulation, opening an avenue for the synthesis of other carbon allotropes and carbon-rich materials from the coalescence of cyclocarbon molecules.
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