Effect of 3,5-Disubstitution on the Optical Properties of Luminescent 2-(2′-Hydroxyphenyl)benzoxazoles and Their Borate Complexes
作者:Julien Massue、Gilles Ulrich、Raymond Ziessel
DOI:10.1002/ejoc.201300616
日期:2013.9
result of a strong excited-state intramolecular proton transfer (ESIPT). This ESIPT process is highly dependent on the nature of the electronic substituents and the polarity of the solvent. Upon coordination to a BF2 fragment, typical singlet emission is observed with λem ranging from 439 to 553 nm and quantum yields from 0.03 to 0.36. If aromatic amines are involved, strong aggregates are observed that
本文介绍了基于 2-(2'-羟基苯基) 苯并恶唑 (HBO) 支架的三种高荧光染料的多步合成和光物理特性,以及它们与 BF2 片段的螯合。这些染料在苯酚环的 3,5-位具有功能化,带有带有 TMS、p-tBuC6H4 或 p-NnBu2C6H4 基团的乙炔基延伸片段。所有新化合物均通过核磁共振光谱、质谱和元素分析进行表征。HBO 染料的光学特性表明,由于强激发态分子内质子转移 (ESIPT),存在烯醇和酮带。这种 ESIPT 过程高度依赖于电子取代基的性质和溶剂的极性。在与 BF2 片段协调后,观察到典型的单线态发射,λem 范围从 439 到 553 nm,量子产率从 0.03 到 0.36。如果涉及芳香胺,则会观察到强聚集体,这些聚集体可以在孤电子对质子化时解离。