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Eleven (E)-4-t-butyl-1-(4-dimethylaminobenzylideneamino)pyridinium perchlorates were obtained by the condensation of 1-amino-4-t-butylpyridinium perchlorate with p-amino-benzaldehydes. The position of the primary band in their UV/VIS spectra was not simply related to the σ substituent constants of the different amino groups. Only two compounds were found to be fluorescent and piezochromic.
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