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(Color online) STM images of ZnPc molecules adsorbed on Cu(100) surface at room temperature. (a) large-area image for a coverage of 0.09 ML, Vb = −3.0 V, It = −0.04 nA. The inset shows the atomic resolution image of the bare copper surface. (b) and (c) high-resolution images were taken at Vb = −1.2 V and It = −0.04 nA for individual enantiomers with L- and R- chirality.
(Color online) STM images of L-chirality enantiomer at Vb =−1.2 V (a) and Vb = 1.1 V (b) compared to the corresponding (d) and (e) simulated images. (c) Top- and side view of the optimized adsorption configuration for the L-chirality enantiomer on Cu(100) surface. The atoms H, N and C are represented by the smaller white dots, the bigger blue dots and the biggest gray dots, respectively. The central dot denotes the Zn atom. The smallest dark red dots represent the arrangement of Cu atoms on the surface.
(Color online) A typical large-area STM image after thermal annealing. (b) High-resolution STM image for ZnPc molecules on the copper step edge and the flat atomic terrace. (c) Histogram for ZnPc molecules in different connected forms as defined in the main text. Successive chiral recognition steps to form (d) L- and (e) R-chirality second-level supramolecular structure.
(Color online) Sub-molecule-resolution STM images for individual R-chirality ZnPc molecule (a) and a linked structure formed by three R-chirality molecules (b), Vb = −0.1 V, It = −0.02 nA. The symbols B1, B2, C, P1, P2, L1 and L2 are defined in the main text.
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