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In the title compound, C22H22O4, the anthracene ring system is slightly non-planar. The two carboxyl­ate groups are both twisted away from the plane of the anthracene ring system by ca. 30°. The crystal packing is stabilized by C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, C18H17Br2N2+·PF6−, four F atoms of the hexa­fluoro­phosphate anion are disordered. The hexa­fluoro­phosphate ions are linked to 1-benzyl-3-[4-(dibromo­meth­yl)benz­yl]imidazolium cations by C—H⋯F hydrogen bonds, which may be effective in the stabilization of the crystal structure. [ABSTRACT FROM AUTHOR]