Synthesis and Structural, Electronic, and Optical Properties of Oligo(thienylfuran)s in Comparison with Oligothiophenes and Oligofurans
作者:Yasuo Miyata、Tohru Nishinaga、Koichi Komatsu
DOI:10.1021/jo048282z
日期:2005.2.1
oligofurans (3). The inter-ring torsional energy profiles calculated for bithiophene 1 (n = 2), thienylfuran 2 (n = 2), and bifuran 3 (n = 2) at the B3LYP/6-31G(d) level indicated that the most stable conformers of 2 (n = 2) and 3 (n = 2) are fully coplanar with transoid structure while that of 1 (n = 2) is twisted with a dihedral angle of 158°. In accord with this, X-ray crystallographic analysis of 2 (n =
通过重复的Stille偶联反应,新合成了具有四个和六个杂环的噻吩/呋喃低聚体,即低聚(噻吩基呋喃)二聚体和三聚体2(n = 4和6)。通过X射线晶体学(n = 4),循环伏安法(CV),紫外可见光谱和荧光光谱以及DFT计算研究了这些低聚物的结构,电子和光学性质。相应的低聚噻吩(1)和低聚呋喃(3)。对联噻吩1(n = 2),噻吩呋喃2(n= 2),而B3LYP / 6-31G(d)水平上的呋喃3(n = 2)表示2(n = 2)和3(n = 2)的最稳定构象异构体与Transoid结构完全共面,而那的1(ñ = 2)被扭曲为158°的二面角。据此,对2(n = 4)的X射线晶体学分析表明,π共轭体系在环间C C-C附近几乎是平面的噻吩和呋喃环之间的C二面角为173.6(7)°,-177.0(7)°和172.6(6)°。在堆积结构中,这些近乎平面的分子以人字形排列。一系列低聚噻吩呋喃2的CV在n