Synthesis and Emission Properties of a Series of 2,3,4,5-Tetrakis(5-aryl-2-thienyl)-1-phenylpyrroles as a Sterically-crowded Star-shaped D-(π-A)<sub>4</sub> Molecule
作者:Hiroki Muraoka、Shunpei Kubota、Satoshi Ogawa
DOI:10.1246/cl.190749
日期:2020.1.5
A series of 2,3,4,5-tetrakis(5-aryl-2-thienyl)-1-phenylpyrroles with different acceptor-type aryl terminals (Ar = p-CN-C6H4, p-CHO-C6H4, p-NO2-C6H4) have been synthesized. The synthesized compounds, possessing a sterically-crowded star-shaped D-(π-A)4 structure, exhibited a significantly large Stokes shifted emission from the planarized intramolecular charge transfer (PLICT) state of the flattened 2,5-bis(5-aryl-2-thienyl)pyrrole component. It was found that the PLICT states of these compounds result in an inherent positive fluorosolvatochromism with different emission color changes due to their different ICT degrees.
一系列具有不同受体型芳基末端的 2,3,4,5-四(5-芳基-2-噻吩基)-1-苯基吡咯 (Ar = p-CN-C6H4, p-CHO-C6H4, p-NO2 -C6H4)已合成。合成的化合物具有空间拥挤的星形 D-(π-A)4 结构,从平坦化的 2,5-bis(5-芳基-2-噻吩基)吡咯组分。研究发现,这些化合物的 PLICT 状态导致固有的正氟溶剂化显色性,由于其不同的 ICT 程度而具有不同的发射颜色变化。