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合成了两个新型方酸菁染料3和5。在酸催化下,2,3,3-三甲基假吲哚不需N-烷基化,可直接与方酸反应。反应过程中发生了明显的质子转移。结晶学数据表明,分子3的整体位于同一平面;溶剂苯规则地排布在方酸四碳环的周围,后者酷似电子陷阱。染料5有良好的水溶性。
Two novel squaraine dyes 3 and 5 were synthesized. Under acid catalysis, 2,3,3-trimethylindolenine does not need to be N-alkylated and can be directly reacted with squaric acid. Significant proton transfer occurred during the reaction. Crystallographic data show that molecules 3 are located in the same plane as a whole. Solvent benzene is regularly arranged around a four-carbon ring of squarylium, which resembles an electron trap. Dye 5 has good water solubility.