Fig. 1. STM observations of IMe on Cu(111). (a) STM image (TSTM ∼ 100 K, Us = 1.58 V, It = 0.11 nA) of a densely packed layer of dimeric NHC–Cu–NHC complexes (examples outlined in yellow) on Cu(111). The unit cell of the overlayer structure is shown in green. The Cu [1̄10] direction is indicated. (b) Line profile across a dimer – see blue line in (a) – compared with the ball-and-stick models of a tetraazafulvalene (top) and a Cu(IMe)2 (bottom) unit. (c) Zoom-in STM image (4.5 × 4.5 nm2) of the left domain in (a) superposed with molecular models, the underlying Cu(111) lattice (thin lines), the overlayer lattice (thick rectangle) and the Cu adatom lattice (dotted line). C, N, H and Cu atoms are represented by black, blue, white and orange spheres, respectively.
