Synthesis, structural characterization and chromatic features of new 2-phenyl-1-benzopyrylium and 2-phenyl-styryl-1-benzopyrylium amino-based blue dyes
作者:Paula Araújo、Ana Rita Pereira、Victor de Freitas、Nuno Mateus、Iva Fernandes、Joana Oliveira
DOI:10.1016/j.tetlet.2021.153487
日期:2021.11
position of the functional groups attached to the 2-phenyl-1-benzopyrylium core and the presence/absence of a 2-styryl linkage in the benzopyrylium moiety are responsible for a different electronic delocalization contributing to the different color displayed by each dye. Compounds presenting a 2-styryl linkage (5,7OH2st4′NMe2 and 7NEt2st4′NMe2) have a higher maximum absorption wavelength (636 nm and 675 nm
六种新型氨基黄鎓染料(5,7OH 2 4'NMe 2、5,7OH 2 st4'NMe 2、7NEt 2 4'NMe 2、7NEt 2 st4'NMe 2、7NEt 2 4'NH 2和7NEt 2 4 'OH) 是通过 2,4,6-三羟基苯甲醛或 4-二乙氨基水杨醛与不同苯乙酮(4-氨基-、4-二甲氨基-、4-羟基-苯乙酮或p-二甲基苯乙烯基甲基酮)。通过LC-MS和NMR分析对获得的基于氨基的染料进行结构表征。结果表明,连接到 2-苯基-1-苯并吡喃核的官能团的性质和位置以及苯并吡喃部分中 2-苯乙烯基键的存在/不存在是导致不同颜色的不同电子离域的原因由每种染料显示。具有 2-苯乙烯基键的化合物(5,7OH 2 st4'NMe 2和 7NEt 2 st4'NMe 2) 具有更高的最大吸收波长(分别为 636 nm 和 675 nm),这可能是由于它们扩展的电子离域。另一方面,与呈现羟基或伯