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KMID : 1059519960400120741
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Journal of the Korean Chemical Society
1996 Volume.40 No. 12 p.741 ~ p.747
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Syntheses and Characteristics of Polymethine Squarylium and Croconium Dyes
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Kim Sung-Hoon
Hwang Seok-Hwan
Song Han-Chul
Yoon Nam-Sik
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Abstract
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The syntheses and absorption spectra of squarylium and croconium dyes were studied. IR data and negative solvatochromism revealed that squarylium dyes have symmetrical 1,3-bonded squarylium rings. A new class of unsymmetrical squarylium dyes and their precursor have also been synthesized. The λmax of croconium dyes undergoes a bathochromic shift of about 100 nm compared with corresponding squarylium dyes. This shift can he calculated by the Pariser-Parr-Pople molecular orbital method.
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