Fig. 3
From: Ring shape-dependent self-sorting of pillar[n]arenes assembled on a surface
Perpendicular arrangement of cationic pillar[5]− and pillar[6]arene molecules on a surface. a Schematic illustration of the experimental setup for the UV-vis absorption spectroscopy of monolayer 1[5]L or 1[6]L film on a quartz substrate. The angle of incident unpolarised UV light is represented by θ. b, c Anisotropic absorption properties of 1[5]L and 1[6]L. UV-vis absorption spectra of 1[5]L and 1[6]L on a quartz substrate measured during exposure to unpolarised UV light with various incident angles (θ of 30°, 40°, 50°, 60°, 70°, 80° and 90°). The downward arrows indicate incident angle change from 90° to 30°. The spectra were corrected for both the irradiated area and substrate absorption
