Fig. 5: STM images and molecular models of the 2D racemic ZZRs.
a, b High-resolution STM images of the sr-ZZRs and rs-ZZRs, respectively. For clarity, the adjacent zigzag rows are painted in different colors. c, d Amplified STM images of the heterochiral sr-dimer and the rs-dimer. e, f DFT optimized molecular models of the heterochiral sr-dimer and the rs-dimer. g, h Simulated STM images of the heterochiral sr-dimer and the rs-dimer. i, j Optimized molecular models of the sr-ZZRs and rs-ZZRs. The blue arrows and the red arrows denote the Br⋯Br contacts within and between the rows, respectively. Tunneling conditions: a Vbias = −0.3 V, It = 50 pA. b Vbias = 0.3 V, It = 50 pA. c Vbias = −0.4 V, It = 50 pA. d Vbias = −0.4 V, It = 100 pA. Scale bars: a, b 2 nm. c–h 0.5 nm. i, j 1 nm.
