| 摘要 |
NEW MATERIAL:A compound shown by the formula I (R1-R3 are lower alkyl; X<-> is anion). EXAMPLE:1-Ethyl-2-( o-hydroxy-p-dimethylamino )styrylbenz[c,d]indolium perchlo rate. USE:An organic electrochromic display element, which is driven at low voltage, so it has a long life. PREPARATION:A quaternary ammonium salt shown by the formula II is heated with an aldehyde shown by the formula III in an organic solvent such as an alcohol, pyridine, acetic acid, etc., optionally in the presence of a catalyst such as acetic anhydride, triethylamine, etc.
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