| 摘要 |
The present invention provides a novel photochromic material which is capable of forming two kinds of aggregates, each having a sharp absorption peak at a different wavelength. The photochromic material comprises a spiropyran compound represented by the following general formula: <IMAGE> wherein R1 and R2 are independently alkyl groups each containing 1 to 30 carbon atoms, and R3, R4, R5, and R6 are independently selected from the group consisting of hydrogen, an amino group, an alkoxy group with 1 to 5 carbon atoms, and an alkylamino group with 1 to 5 carbon atoms with the proviso that at least one of R3, R4, R5, and R6 is an amino group, an alkoxy group or an alkylamino group.
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