Fig. 2: Preparation of hybrid organic crystal arrays.

a The chemical structures of crystals 2‒4 and photos (recorded under weak UV light and against a black background for clarity, green is crystal 2, yellow is crystal 3, and red is crystal 4) showing their mechanically induced bending. b Process for preparation of hybrid organic crystal arrays (kept at relative humidity RH = 62%, 64%) and their collective bending induced by illumination with infrared light (250 W). Photographs of the arrays are provided next to the illustrations. The blue and red hues are due to reflection of light from the background. All scale bars are 2 mm.