| abstract |
Disclosed is a chromene compound which has double peak characteristic, and has a skeleton represented by formula (1) wherein: Z represents any one of the groups presented in formula (2); n is an integer from 1 to 3, if n is 2 or 3, the Z groups are either identical or different but the plurality of Z groups does not consist solely of -CH-, and if n is 1, Z is not -CH-; R is an electron withdrawing group with a Hammett σ greater than 0, and if there are a plurality of Rs, the Rs can be either identical or different; and X and Y are each independently an oxygen atom or =NR, but X and Y are not both oxygen atoms at the same time. |