The Multiradical Character of One- and Two-Dimensional Graphene Nanoribbons

Since the first experimental realizations of graphene nanoribbons,1 graphene nanodevices2 have attracted enormous attention in the quest for future nanoscale technologies. Because of their small band gaps and high charge-carrier mobilities, n-acenes (Figure ​(Figure1)1) and functionalized acenes are being considered as highly interesting building units for organic electronic materials.3 Zigzag nanoribbons feature remarkable spin-polarization and half-metallic properties4 and chemically fascinating challenges have to be solved in the synthesis of such extended polyaromatic hydrocarbons (PAHs).5 Moreover, the chemical properties of graphene nanoribbons may be linked to the reactivity of black carbon surfaces and PAHs in soils, affecting the accumulation of persistent organic pollutants with environmental implications.6