Fig. 3.

On-surface generation of indeno[1,2-b]fluorene (IF). 6,12-Dihydroindeno[1,2-b]fluorene (3) was dehydrogenated with bias pulses typically between 3.5 and 4.3 V. a–e Constant-height AFM images of the precursor molecule 3 (a, d), of radical 3′ (b) and IF (c, e) measured with a CO tip at V = 0 on Cu(111) (a–c) and on 2 ML NaCl (d, e), respectively. Images were taken at tip height offsets a Δz = −1.3 Å, b Δz = −2.0 Å, c Δz = −2.5 Å, d Δz = 1.7 Å and e Δz = 1.5 Å with respect to the STM setpoint of I = 1.0 pA and V = 0.1 V above the respective substrate. Scale bars, 500 pm