Anisotropy Photoinduction during the Mass Associations of Dye Molecules in Gelatin Films

By using the video microscopy, the picture of the formation of anisotropy photoinduction in the form of grains in time is shown, when anisotropy in the film is induced in individual micrograins and the concentration and sizes of the grains are modulated depending on the light exposition. This phenomenon was observed in the gelatin film dyed with the mixture prepared with the saturated solutions of Chrysophenine and Acridine Yellow mixed with 1？:？1 proportion. 1. Introduction Gelatin films and films of other gels dyed with azo-dyes are worthy of attention in respect of their use in the optical use of data, nonlinear optics, holography and other fields. In the scientists’ opinion, the anisotropy photoinduction in these films is the result of trans-cis-trans transformations by light [1, 2]. However, to obtain high effect during the anisotropy photoinduction, the concentration of dyes in the film must be as high as possible. As for the increased concentration of dye in the solutions, it leads to the formation of molecule associations in a solid state playing an important role in the photo-induced effects [3–7]. Based on the study of the dependence of the spectral transmission in the crossed polarizers of the gelatin film dyed with Chrysophenine with photo-induced anisotropy on the active light exposition [3], an opinion about the possible anisotropy photoinduction in organic compounds in the form of grains and increase of concentration of grains and their areas particularly depending on the light exposition in the film was expressed. The given work for the first time presents the visual evidence of the anisotropy photoinduction of the given kind in organic compound. The effect was observed in the gelatin film containing mass associations of the molecules obtained by mixing the saturated water solutions of Chrysophenine and Acridine Yellow with 1？:？1 proportion in gelatin [4]. 2. Experiment First, the saturated water solutions of Chrysophenine and Acridine Yellow were prepared for the experiment (see Figure 1). Figure 1: Chemical structures of (a) Chrysophenine and (b) Acridine Yellow. Then, they were mixed with the proportion 1？:？1, and we shot the absorption spectra of the mixture and constituent components as 1, 2, and 3, respectively (see Figure 2). The spectra were shot with the Avantes spectroscope. Curve 4 in Figure 2 is the curve of the mixture deflection from additivity. It was obtained by subtracting the sum of the absorption spectra 2 and 3 of the mixture constituent components from mixture absorption spectrum 1. As we can see, it shows the