On-surface chemistry was used to synthesized three different nitrogen-substituted undecacenes (IMAGE)
Caption
From a specifically designed novel diethano-bridged precursor molecule including four nitrogen atoms, on-surface chemistry was used to synthesized three different nitrogen-substituted undecacenes: (left to right) tetraazaundecacene, hydrogenated tetraazaundecacene and its analog with edge-fused five-membered rings. Tetraazaundecacene was found to exhibit considerable open-shell character, with unpaired electrons along the two zigzag edges, indicated by the blue and orange arrows. Rings are colored based on local aromaticity, calculated with the NICSπzz(1) method, showing overall aromaticity and local antiaromaticity induced by the hydrogenated nitrogen atoms.
Credit
Kristjan Eimre, Empa
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