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The title compound, C 21 H 12 Br 2 F 13 NO·2CH 3 OH, was obtained by condensation of 4-methyl-1-(1 H ,1 H ,2 H ,2 H -perfluoro-oct-yl)pyridinium iodide and 3,5-di-bromo-4-hy-droxy-benzaldehyde, followed by deprotonation. It crystallizes as a methanol disolvate and exhibits short O-H⋯O hydrogen bonds and a disordered perfluoro-alkyl chain [occupancy ratio 0.538 (7):0.462 (7)]. Significant π-π stacking inter-actions are observed between the benzene and pyridine rings of neighbouring mol-ecules along the b- axis direction.

acta crystallographica. section e, crystallographic communications

(E)-2,6-Dibromo-4-{2-[1-(1H,1H,2H,2H-perfluorooctyl)pyridinium-4-yl]ethenyl}phenolate methanol disolvate, a fluoroponytailed solvatochromic dye