Theoretical Studies of Complexes Transition Metal Thermophotochromic Systems

摘要

Studies of the heat - and light-induced darkening of copper bromide films and solutions (see AD-470 074 and AD-645 539) provided the following conclusions: Darkening occurred as a result of equilibrium shifts to give dark copper complexes and that darkening could be increased varying the solvent or bromide concentration; the darkening reaction is basically thermal. Solutions and films were prepared which darkened considerably on heating through equilibrium shifts without loss of solvent. Absorbances at 100C averaged over the visible spectrum were as much as six times those at room temperature. These systems should be usable in stable liquid or film laminations. Also investigated was the electrical actuation of films with direct current, dielectric heating, and induction heating. Full darkening in about 0.1 seconds was demonstrated, but the fastest intrinsic response time for electrical actuation was not measured. Studies were also made of the darkening of copper bromide - dimethyl sulfoxide complexes, and of the nature of the reflective surfaces formed on some copper bromide films during darkening. (Author)