An
isoindoline derivative of formulawhereinX is N, C—CN or C—COR2;Y is a radical having an acidic group or a basic group;R1 is independently from one another
halogen or C1-C4-
alkyl, said
alkyl is unsubstituted or substituted with
halogen;R2 is C1-C4-
alkyl, said alkyl is unsubstituted or substituted with
halogen; andn is 0, 1, 2, 3 or 4,with the proviso that Y does not include an acidic group if X is C—CN or C—COR2, and compositions containing the same are provided. The
isoindoline derivative and the
pigment composition are suitable, for example, for coloring
high molecular mass organic material, especially paints, printing inks,
resist formulations for color filter applications, electrophotographic toners,
cosmetics, plastics, films or fibers.