The magnetism of nanographene is dominated by the structure of its carbon skeleton. However, the magnetism engineering of nanographene is hindered due to finite precursors. Here, we demonstrate an ingenious synthetic strategy to engineer the magnetism of nanographene through hetero-coupling two precursors on Au(111) surface. Bond-resolved scanning tunneling microscopy and spectroscopy results show that two homo-coupled products host a closed-shell structure, while the products with five membered ring defects perform as an open-shell one with the total spin number of 1/2, confirmed by spin-polarized density functional theory calculations. While two hetero precursors on Au(111) substrate, the hetero-coupled products both perform as the magnetic structure with total spin quantum numbers of 1/2 and 1, resulting from carbon skeleton transformations. Our work provides an effective way to engineer the magnetism of nanographene by enriching the magnetic products simultaneous, which could be extended into other controllable magnetic nanographene instruction.

纳米石墨烯的磁性主要取决于其碳骨架的结构。然而，由于有限的前体，纳米石墨烯的磁性工程受到阻碍。在这里，我们展示了一种巧妙的合成策略，通过在 Au(111) 表面上异质耦合两种前体来设计纳米石墨烯的磁性。键分辨扫描隧道显微镜和光谱结果表明，两种同源耦合产物具有闭壳结构，而具有五元环缺陷的产物表现为总自旋数为 1/2 的开壳结构，由自旋极化密度泛函理论计算。虽然 Au(111) 衬底上有两种异质前驱体，但异质耦合产物均表现为总自旋量子数为 1/2 和 1 的磁性结构，这是由碳骨架转变产生的。