含碲唑杂环的不对称碳菁及方酸菁的合成与性质

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

以苯并碲唑季铵碘盐为原料，将其与3-乙基-2－（β-乙酰苯胺）乙烯苯并噻唑碘化季铵盐在无水吡啶中回流，得到4个含碲不对称碳菁染料．上述季铵盐与方酸的反应不同于一般杂环碱，只能发生1：1缩合反应，缩合产物与苯并噻唑碘盐在正丁醇／吡啶中反应即得含碲不对称方酸菁染料．该法避免了通常制备不对称方酸菁所带来的分离纯化的困难，从而提供了制备不对称方酸碲菁染料的通用方法，研究了不对称碲碳菁的"Brooker偏差"，结果符合一般规律．

Starting from benzotellurazolium iodldes, four asymmetric carbocyanlne dyescontaining tellurium were synthesized by refluxing with 3-ethy1-2-(β-acetylanilide) vinylbenzothiazolium iodlde in dry pyridine. A convenient 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.