Photochromism, a chemical structure is reversible color change between two different absorption spectra. Photochromic material change color when exposed to UV light. Photochromism open to the public-close and cis-trans isomerization is based on mechanisms such as. T-type photochromism, visible-light photochromic materials through heating or to convert from color to become discolored. P-type photochromism, a photochromic material from colorless to a colored state to a state photochemical transformation. A photochromic material is colorless in the dark and under ultraviolet light can be turning colors, the positive is called photochromic. Negative photochromism of a material with photochromic ultraviolet light in the darkness and becomes colorless when it is fotokromizm flip flops are painted a tour.
Chemical structures of photochromic dyes
Photochromic substances can be divided in this way: cis/trans isomerization and intramolecular hydrogen bonds Heterolitik homolitik pericyclic reaction of the group for the electronic transfer transfer transfer reaction