| abstract |
Provided is a compound and the like having excellent light resistance and storage stability. A compound characterized by having a structure represented by formula (1) or (2). [In formulas (1) and (2), R1 and R2 each independently represent a C1-8 unsubstituted alkyl group; R3 and R4 each independently represent a hydrogen atom, C1-8 unsubstituted alkyl group or substituted alkyl group, C2-8 unsubstituted alkenyl group or substituted alkenyl group, C7-12 unsubstituted aralkyl group or substituted aralkyl group, or C6-12 unsubstituted aryl group or substituted aryl group, or R3 and R4 bond to form a nitrogen-containing heterocycle; R5 and R6 each independently represent a hydrogen atom, C1-8 unsubstituted alkyl group or substituted alkyl group, C2-8 unsubstituted alkenyl group or substituted alkenyl group, C7-12 unsubstituted aralkyl group or substituted aralkyl group, or C6-12 unsubstituted aryl group or substituted aryl group, or R5 and R6 bond to form a nitrogen-containing heterocycle; substituents in the substituted alkyl groups of R3-R6 are cyano groups or alkoxy groups (however, the number of carbon atoms in the substituents is not included in the number of carbon atoms stipulated above); the substituents in the substituted alkenyl groups, aralkyl groups, and aryl groups of R3-R6 are functional groups selected from the group consisting of alkyl groups, cyano groups, and alkoxy groups (however, the number of carbon atoms in the substituents is not included in the number of carbon atoms stipulated above); and X- shows an anion.] |