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. 2011 Oct 11;2:674–680. doi: 10.3762/bjnano.2.72

Figure 3.

Figure 3

STM images and tentative molecular packing model of macrocycle 2 and 1 co-self-assembled at the trichlorobenzene/graphite interface. The unit cell parameters are a = 4.7 ± 0.2 nm, b = 4.4 ± 0.1 nm, γ = 65 ± 3°. a) 37.5 nm × 37.5 nm iT = 67 pA, VS = −554 mV. b) High resolution STM image, 17.2 nm × 17.2 nm, iT = 45 pA, VS = −554 mV, the unit cell and the orientations of the main crystallographic directions of the underlying graphite surface are indicated in red. c) Schematic representation of the tentative packing model of co-self-assembly of macrocycle 2 (bottom molecules) and 1 (top molecules in green). The iodide ions are depicted in black and highlighted by a red circle. Based on the STM contrasts, measurements of the area available for adsorption of alkyl chains, and the ideal periodicity for physisorbed alkanes on graphite [18–19], it can be concluded that only eight out of twelve alkyl chains per molecule are adsorbed on graphite. d) 67.8 nm × 67.8 nm, iT = 36 pA, VS = −537 mV, e) High resolution STM image, 18.1 nm × 18.1 nm, iT = 37 pA, VS = −561 mV.