Acid-responsive Emission Color Changes of Diarylaminobenzylideneanilines

Emission color changes of 4-[bis(4-methylphenyl)amino]benzylideneaniline (BMBZA) and 4-[bis(9,9-dimethylfluoren-2-yl)amino]benzylideneaniline (BFBZA) in response to hydrochloric acid (HCl) vapor solid organic acids, pentafluorobenzoic (PFBA) benzoic (BA), have been investigated their different states. BMBZA crystals changed from greenish blue reddish orange by exposure HCl vapor, whereas the emission BFBZA did not. However, powder sample obtained grinding crystal exhibited change vapor. Similar results PFBA were obtained. In case BMBZA–BA BFBZA–BA systems, crystalline mixtures allowed without object colors.