5-N-Arylaminothiazoles as Highly Twisted Fluorescent Monocyclic Heterocycles: Synthesis and Characterization
作者:Kirara Yamaguchi、Toshiaki Murai、Saki Hasegawa、Yohei Miwa、Shoichi Kutsumizu、Toshifumi Maruyama、Takahiro Sasamori、Norihiro Tokitoh
DOI:10.1021/acs.joc.5b01963
日期:2015.11.6
adopt structures that are highly twisted from planar conformations. Their orientations were tuned by the steric and/or electronic interactions of the substituents at their 2-, 4-, and 5-positions. The 5-aminothiazoles exhibited a range of fluorescent emissions, from blue to orange. Although the absorption spectra were independent of the polarity of the solvent, fluorescent emissions were influenced
通过使衍生自仲硫代酰胺的硫代酰胺二阴离子与硫代甲酰胺反应,然后依次用碘进行氧化,可以制备一系列5-N-芳基氨基噻唑。X射线分析表明,它们采用了与平面构象高度扭曲的结构。它们的取向通过在其2-,4-和5-位上的取代基的空间和/或电子相互作用来调节。5-氨基噻唑显示出从蓝色到橙色的一系列荧光发射。尽管吸收光谱与溶剂的极性无关,但荧光发射受溶剂的极性影响:在极性更大的溶剂中,发射发生红移。根据Lippert-Mataga图以及基态和激发态之间的偶极矩变化对这些现象进行了检验。它们还表现出固态发光,再次从蓝色到橙色。5-氨基噻唑的循环伏安法显示单电子氧化的可逆波。通过将电子给体基团引入到5-位氮原子上的苯基上,可以降低氧化的半电位。进行了DFT计算以确定HOMO和LUMO的能级。最后,TG-DTA的结果表明它们是热稳定的。进行了DFT计算以确定HOMO和LUMO的能级。最后,TG-DTA的结果表明