Fig. 3
From: Tailoring atomic layer growth at the liquid-metal interface
The helicene-Au complex. a Molecular structures of the two enantiomers of diazadithia[7]helicene, (P)-1 and (M)-1. b, c STM images of the linear superstructure of (P)-1 formed at room temperature (C = 20 µM, Iset = 100 pA, Vbias = -800 mV) and at 4 °C (C = 20 µM, Iset = 100 pA, Vbias = −900 mV) at the TCB/Au(111) interface, respectively. d–g Close-up STM image (3.5 × 5.0 nm2) and structural model of the linear structure of (P)-1 formed in a room temperature solution (d, e) and at 4 °C (f, g), respectively. In the structural models, Au adatoms are dark brown. Carbon atoms are displayed in light blue, except for those of the protruding part of a helicene, which are displayed in grey. The brightest features in the STM images are attributed to the protruding part of the helicene molecules. Equivalent \(\left[ {11\bar 2} \right]\) directions of the underlying Au(111) surface are indicated with blue arrows. Scale bars: b, c, 5 nm
