Thiophene-Containing Pechmann Dyes and Related Compounds: Synthesis, and Experimental and DFT Characterisation
作者:Eric Assen B. Kantchev、Tyler B. Norsten、Marilyn L. Y. Tan、Joey J. Y. Ng、Michael B. Sullivan
DOI:10.1002/chem.201101903
日期:2012.1.9
Attaching 2‐thienyl residues to the Pechmann dye core chromophore (5,5‐exo‐dilactone situated around a CC double bond) results in a novel magenta‐coloured compound (UV/Vis spectroscopy λmax=570 nm in CHCl3), which can be rearranged to a yellow 6,6‐endo‐dilactone (λmax=462 nm in CHCl3). Single and double amidation results in pronounced redshift in the 5,5‐exo series (violet, λmax=570 nm and blue, λmax=606 nm
附着2-噻吩基残基到Pechmann染料发色团核心(5,5-外切-dilactone围绕位于一个C C双键)的结果的新的品红色化合物(UV / Vis光谱λ最大在CHCl = 570nm的3) ,它可以重新安排成黄色6,6-内切(-dilactone λ最大在CHCl = 462nm的3)。单并在显着红移双酰胺化导致5,5-外切系列(紫,λ最大= 570纳米,蓝,λ最大= 606纳米在CHCl 3,分别地),但显着蓝移的6,6-内切系列(黄色,λ最大= 424纳米和浅上无色黄色接壤,λ最大= 395nm的在CHCl 3分别)。噻吩环上的3-烷基取代基的掺入允许溶解度急剧增加在有机溶剂中与颜色的微调伴随:在5,5-红移外型-dilactones但是在蓝移5,5-外切-dilactams 。DFT计算表明,无论是否存在3-烷基,这两种内酯类都是平面的。内酰胺衍生物是非平面的:噻吩核生色团二面角从5