Synthesis, Properties of Asymmetric Carbocyanine Dyes and Squarylium Cyanine Dyes Containing Benzotellurazoles

Abstract

Abstract: Starting from benzotellurazolium iodldes, four asymmetric carbocyanlne dyescontaining tellurium were synthesized by refluxing with 3-ethy1-2-(β-acetylanilide) vinylbenzothiazolium iodlde in dry pyridine. Aconvenient procedure for synthesis of asymmetricsquarylium cyanlnes has been developed. The particular reactiveness betweenbenzotellurazolium iodide and squarlc acid was found. Only 1:1 condensation is Involved in thisreaction, and the resultant can condense easily with benzothiazolium lodide to give asymmetricsquarylium dye of tlnique component without separation. The "Brooker deviation" of theasymmetric telluracarbocyanines was also discussed.

Key words: Benzotellurazole, Cyanine dye, Carbocyanine dye, Squarylium cyanine, Synthesis

CLC Number:

O627.61

TrendMD:

LUO Xue-Hong, LIU Xiu-Fang, XU Han-Sheng. Synthesis, Properties of Asymmetric Carbocyanine Dyes and Squarylium Cyanine Dyes Containing Benzotellurazoles[J]. Chem. J. Chinese Universities, 1997, 18(9): 1474.

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Synthesis, Properties of Asymmetric Carbocyanine Dyes and Squarylium Cyanine Dyes Containing Benzotellurazoles

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