Syntheses and properties of functional aminosquarylium dyes

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Kyungpook Natl Univ, Taegu, Korea, Republic of [1 ]
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来源：
Dyes Pigm | / 2卷 / 145-154期
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Calculations - Condensation - Iodine - Light absorption - Molecular structure - Optical properties - Organic compounds - Structure (composition) - Synthesis (chemical);
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摘要：
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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