Organic Photochromes

Only a small part of the numerous phohemical reactions in organic compounds result in reversible structural changes. The latter are accom­ panied by a change in physical properties, in particular, of electronic spectra. It is tempting to try to use this phohromic effect in various systems for controlling and regulating light fluxes and for data recording. Eventually an independent trend emerged in phohemistry - the study of the phohromism of organic compounds to establish relationships betw...