Synthesis and Absorption Spectral Shifts of Novel Squarylium Dyes.

  • Koh Kwang-Nak
    Sensor Technology Research Center, Kyungpook National University
  • Hwang Seok-Hwan
    Department of Dyeing and Finishing, Kyungpook National University
  • Han Sun-Kyung
    Department of Dyeing and Finishing, Kyungpook National University
  • Kang Shin-Won
    Sensor Technology Research Center, Kyungpook National University
  • Kim Sung-Hoon
    Department of Dyeing and Finishing, Kyungpook National University

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  • Synthesis and Absorption Spectral Shift

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Abstract

Two kinds of new squarylium dyes have been prepared. Aminosquarylium dyes (ASQ) (6) have been prepared by condensation of aminosquarates (3) and 1-ethyl-2, 3, 3-trimethylindolenium iodide (5). New aminosquarylium dye 6a absorbed at a longer wavelength (18nm) than the corresponding squarylium dye (SQ) 7c.<br>A new class of dithiosquarylium dyes (DTSQ 8) has also been synthesized by the reaction of squarylium dye (SQ) with Lawesson's reagent or P4S10. The λmax of DTSQ dyes undergoes a bathochromic shift of about 25nm compared with corresponding SQ dyes.<br>The visible absorption spectra of ASQ and DTSQ dyes are well accounted for by PPP-MO calculations.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 54 (2), 72-76, 1998

    The Society of Fiber Science and Technology, Japan

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