Abstract
Aminosquarylium dyes(6a–d) were prepared by condensation of aminosquarates (3a–d) and 1-ethyl-2,3,3-trimethylindolenium iodide (5) and structure of dye 6 was discussed on the basis of IR and solvatochromism. A new aminosquarylium dye 6a absorbed at a longer wavelength (18 nm) than the corresponding squarylium dye 7. The light absorption characteristics of representative examples are well accounted for with the PPP-MO calculation. The photostability properties of dye 6d was also investigated in solution with a high pressure mercury lamp when iodine was replaced by benzene dithiol metal complex as a counter anion, the photochemical stability being better than that of dye 7.
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