Fig. 4. STM images (a, b and c; 10 × 10 nm2) of the boundaries of sCOFA during the reaction process. (a) The long trefoil structure, outlined by the black ring. (b) The short trefoil structure highlighted by the yellow ring. (c) The zig–zag structure shown by the red ring. (d) Structural models for the boundaries of sCOFA during the reaction process. (e) Chemical structure for the long trefoil structure. (f) Chemical structure for the short trefoil structure. (g) Chemical structure for the zig–zag structure. Imaging conditions: V bias = 650 mV, I t = 660 pA.
