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A series of amphiphilic azo-methine dyes with different relative positions of electron-accepting groups, (E)-N-octadecyl-2-[2-(4-N,N-dimethylaminophenyl)azomethinyl]quinolinium iodide(QN2), (E)-N-octadecyl-4-[2-(4-N,N-dimethylaminophenyl)azomethinyl]quino