Substituted Imidazonaphthyridine Derivatives. I. C₁₉H₁₄F₃N₃, C₁₈H₁₀F₅N₃, C₁₈H₁₁ClF₃N₃ and C₁₈H₁₁BrF₃N₃

The structures of four 2,6,8-trisubstituted imidazonaphthyridine derivatives, 6-methyl-2-(4-methylphenyl)-8-trifluoromethylimidazo[1,2-a][1,8]naphthyridine, (I), 2-(3,4-difluorophenyl)-6-methyl-8-trifluoromethylimidazo[1,2-a] [1,8]naphthyridine, (II), 2-(4-chlorophenyl)-6-methyl-8-trifluoromethylimidazo[1,2-a][1,8]naphthyridine, (III), and 2-(4-bromophenyl)-6-methyl-8-trifluoromethyl­imidazo[1,2-a][1,8]naphthyridine, (IV), are reported. The molecules are planar and exist as dimers, formed through intermolecular C—H...N hydrogen bonds in all four cases. The trifluoromethyl group undergoes rotational disorder in (II)–(IV). The molecules are laid in two-dimensional planes in the crystal lattice with possible intermoleculear π...π interactions.

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