Fig. 4.
Light-induced expulsion of fluorinated azobenzene 5 from coordination cage 1. (A) Thin piece of agarose gel soaked with an aqueous solution of (trans-5)2 ⊂ 1 subjected to 520-nm irradiation for increasing periods of time (indicated on the top). (Right) X-ray crystal structure of cis-5. (B) Writing and erasing an image in a 52 ⊂ 1-soaked agarose gel using green light (with a mask) and blue light, respectively. (C) Four images created consecutively in the same piece of light-sensitive agarose gel. Clockwise from Top Left: the Penrose triangle, the structural formula of cis-5, Plane-Filling Motif with Reptiles (a 1941 woodcut by M. C. Escher; all M.C. Escher works © 2018 The M.C. Escher Company, The Netherlands. All rights reserved. Used by permission. www.mcescher.com), and part of the logo of the Weizmann Institute (reproduced with permission of the Weizmann Institute of Science).