Diboron and Triboron Compounds Based on Linear and Star-Shaped Conjugated Ligands with 8-Hydroxyquinolate Functionality: Impact of Intermolecular Interaction and Boron Coordination on Luminescence
作者:Yi Cui、Suning Wang
DOI:10.1021/jo060841+
日期:2006.8.1
New 8-R-quinoline functionalized linear and star-shaped conjugated molecules have been synthesized using Suzuki−Miyaura coupling methods (R = MeO, L1−L5; R = CH3OCH2O, L1‘−L5‘). When treated with HCl, L1‘−L5‘ are converted readily to the corresponding 8-hydroxyquinoline compounds L(OH)1−L(OH)5 which react readily with BPh3 in refluxing THF to produce the corresponding polyboron chelate compounds B1−B5
使用Suzuki-Miyaura偶联方法(R = MeO,L1 - L5; R = CH 3 OCH 2 O,L1' - L5 ')合成了新的8-R-喹啉官能化的线性和星形共轭分子。当用HCl,处理过的L1 “ - L5 ”被容易地转化为相应的8-羟基喹啉化合物大号(OH)1 -大号(OH)5,其容易与BPH反应3在回流的THF中,以产生相应polyboron螯合物B1 - B5丰产。L1 -L5和B1 - B5在〜300°C时的T d表现出相似的热稳定性。实验和分子轨道计算结果表明,硼的螯合作用稳定了配体的LUMO能级,并缩小了HOMO-LUMO间隙,导致配体发蓝光,硼化合物发绿光或橙光。L1,L3和L5的晶体结构表明,这些分子在固态下具有层状排列,且具有明显的分子间π-π相互作用。线性二硼B5由于分子间的相互作用,显示出溶液中浓度和温度相关的发射。研究了单硼化合物BPh 2(5-Ph-