Among them, triangulene dimers, also referred to as n = 2 oligomers, usually serve as a gauge for assessing the magnetism of more extended one-(1D) and twodimensional (2D) polymers. However, to date, only weak magnetic coupling has been achieved, such as -14 meV for directly-linked dimers and -2 meV for phenyl-bridged dimers. This limits their practical applications at room temperature as they fall below the Landauer limit for minimum energy dissipation. Therefore, it is essential to develop strategies to enhance the magnetic coupling in triangulene dimers for both fundamental understanding and practical applications. Furthermore, while only antiferromagnetism has been observed in dimers, the search for robust ferromagnetism in organic magnets is a long-standing research goal in metal-free magnetism. In principle, according to the Goodenough-Kanamori rule, the magnetic interactions are governed by both FM potential exchange K and AFM kinetic exchange, i.e. superexchange, -4t 2 /U, where t and U represent the electronic coupling and Coulomb repulsion, respectively. This superexchange, arising from the virtual hopping of anti-paralleled spins at adjacent sites, usually dominates the spin configuration in organic magnets, owing to the strong electronic coupling in πconjugated systems. However, it is promising to manipulate the balance between these two exchange sources and realize metal-free FM nanographenes with high-spin states. Consequently, it is of significance to explore and engineer the spin interactions in triangulene dimers, which will provide profound insights into the magnetic properties of extended systems.