N-Salicylideneaniline (SA) derivs. are traditional org. photochromic compds. whose properties are closely related to their mol. conformations and crystal structures. We herein present the photochromic property switching phenomenon of SA ammonium salt crystals using a deammoniation reaction. The N-salicylidene-4-carboxyaniline ammonium salt crystal (1-Sﾎｱ) was found to exhibit photochromism upon irradn. with UV light. Upon heating, 1-Sﾎｱ desorbed ammonia gas and transformed into a nonionic SA crystal (1-N) with non-photochromic properties. Surprisingly, this phase transition induced the "jumping crystal" phenomenon. Thus, the crystal structures both before and after the phase transition were detd., and it was revealed that the switching phenomenon of photochromism (photochromism switching) was caused by the crystal structural and mol. conformational changes that took place upon deammoniation. In addn., 1-N reverted to 1-Sﾎｱ by exposure to aqua-ammonia vapor for a few minutes. These results suggested that such SA crystals could be applicable as switching materials or chem. sensors. [on SciFinder(R)]
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