Figure 145.

(A) Chemical structure of the halogen-bonded liquid-crystalline complex employed in ref (489). (B) Polarized absorption spectra of a thin film (250 nm) of the complex shown in (A). Black curve: initial spectrum (same for both polarizations). The red and blue curves correspond to the polarized absorption spectra in the directions parallel (A_∥ < A₀) and perpendicular (A_⊥ > A₀) to the polarization plane, taken after 30 and 120 s of irradiation (488 nm, 100 mW/cm²), respectively. The absorption anisotropy is an unambiguous sign of photoinduced reorientation of the azobenzene chromophores. (C) Atomic force microscopy view of the spin-coated thin film of the complex shown in (A) after SRG inscription (5 min, 488 nm, 300 mW/cm²). The surface-modulation depth after the SRG inscription was 600 nm, 2.4 times the initial film thickness. Reprinted with permission from ref (489). Copyright 2012 Wiley-VCH.