Photochromic Behaviour of Non-transition Metal Chelate Complexes of Salicylaldimines

Bis(N-alkylsalicylaldiminato)zinc(II) and the beryllium(II) complexes 1, as well as 5,6-benzo-1,3,2-oxazaborines 2, display photochromic behaviour in solution, while undergoing thermally-irreversible photocoloration reactions in bulky amorphous films.