Vapor Switching of Photochromism of Methylenebis{N-(3,5-di-tert-butylsalicylidene)aniline} Crystals

Photochromic behavior of 5,5' -methylenebis{2 -(3,5-di-tert-butylsalicylideneamino)phenol) 1} crystal, which exhibited vapochromism, was completely controlled by contact with methanol vapor. Maintenance of a reaction room in the crystal was the key to start solid-state photoinduced isomerizaton of Schiff base.