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Although the unconventional $\pi$-magnetism at the zigzag edges of grapheneholds promise for a wide array of applications, whether and to what degree itplays a role in their chemistry remains poorly understood. Here, we investigatethe addition of a hydrogen atom $-$ the simplest yet the most experimentallyrelevant adsorbate $-$ to zigzag graphene nanoribbons (ZGNRs). We show that the$\pi$-magnetism governs the chemistry of ZGNRs, giving rise to a site-dependentreactivity of the carbon atoms and driving the hydrogenation process to thenanoribbon edges. Conversely, the chemisorbed hydrogen atom governs the$\pi$-magnetism of ZGNRs, acting as a spin-$\frac{1}{2}$ paramagnetic center inthe otherwise antiferromagnetic ground state and spin-polarizing the chargecarriers at the band extrema. Our findings establish a comprehensive picture ofthe peculiar interplay between chemistry and magnetism that emerges at thezigzag edges of graphene.

Hydrogen Atoms on Zigzag Graphene Nanoribbons: Chemistry and Magnetism Meet at the Edge