DAST TWIN CRYSTAL, PROCESS FOR PRODUCING THE SAME AND USE THEREOF

摘要

Novel crystal of 4-dimethylamino-4-stilbazolium tosylate (DAST) useful as an electro-optical element. DAST with a size effective for use as an electro-optical element could be provided by a twin crystal of DAST. The twin crystal of DAST could be obtained according to the seed crystallization method or slant crystal growing method.