9,10-Bis{2-[1-(2-pyridylmeth-yl)imidazolium-3-yl]eth-oxy}anthracene bis(hexa-fluoridophosphate).

The cation of the title compound, C(36)H(34)N(6)O(2) (2+)·2PF(6) (-), lies across a crystallographic inversion centre. The imidazole and pyridine rings form dihedral angles of 82.28 (5)° and 11.87 (7)°, respectively, with the anthracene ring system. The crystal packing is stabilized by π-π inter-actions between the pyridine ring and the central ring of anthracene, with a ring centroid-centroid distance of 3.684 (3) Å. The PF(6) (-) anion is disordered over three different positions with occupancies of 0.284 (6), 0.354 (8) and 0.362 (9).

N,N'-bis(2-methoxyphenyl)naphthalene-1,4-dicarboxamide.

The title compound, C26H22N2O4, crystallizes in an anti-C=O orientation, with the two N-substituted benzene rings in different conformations relative to the naphthalene ring. These conformations allow two strong N-H...O hydrogen bonds and one C-H...pi interaction to generate molecular chains in the cell.