Fluorescent benzene-centered mono-, bis- and tris-triazapentadiene–boron complexes
作者:Christoph Glotzbach、Nadine Gödeke、Roland Fröhlich、Constantin-Gabriel Daniliuc、Shohei Saito、Shigehiro Yamaguchi、Ernst-Ulrich Würthwein
DOI:10.1039/c5dt00908a
日期:——
A series of novel benzene centered mono-, bis- and tris-1,3,5-triazapentadiene ligands 6a–e was synthesized and investigated with respect to their reactivity towards triphenylborane. The resulting blue-fluorescent boron complexes 14a–e with a six-membered ring chelate structure show excellent thermal and chemical stability. All title compounds were completely characterized including X-ray diffraction
合成了一系列新颖的以苯为中心的单,双和三,1,3,5-三氮杂戊二烯配体6a-e,并研究了它们对三苯基硼烷的反应性。所得的具有六元环螯合物结构的蓝色荧光硼配合物14a-e显示出出色的热稳定性和化学稳定性。所有标题化合物均已完全鉴定,包括14a–c和14e的X射线衍射研究。尽管所有三类化合物的吸收光谱相似,但荧光光谱显示出明显的差异。因此,14a,b的发射光谱显示斯托克斯位移为4100–6700 cm -1在溶液和固态中均具有较低的量子产率。但是,与14a,b相比,体积更大的化合物14c–e显示出更大的摩尔消光系数和较小的红移。对于所有化合物,与二氯甲烷溶液相比,我们观察到固态的红移荧光明显更强。为了解释吸收特性,基于DFT几何优化进行了TD-DFT研究。