Crystal Structure of Pigment Yellow 138 Derivative

Abstract

An X-ray analysis of the title pigment was undertaken to understand the structure-stability relationships. The molecule takes a non-planar structure, because of the 2-(inden-2-yl)quinoline and isoindoline fragments being twisted at the C8-N21 bond. The dihedral angles between three planar moieties are 4.2(3) and 64.4(3)°. In the crystal structure, the flat 2-(inden-2-yl)quinoline fragments are stacked opposed to each other. The isoindoline rings sandwich the solvent molecules. The solvent molecule sits on a crystallographic center of symmetry, and is disordered in the solvent channels along the c-axis.