Diarylamino- and Diarylboryl-Substituted Donor–Acceptor Pyrene Derivatives: Influence of Substitution Pattern on Their Photophysical Properties
作者:Ryohei Kurata、Akihiro Ito、Masayuki Gon、Kazuo Tanaka、Yoshiki Chujo
DOI:10.1021/acs.joc.7b00315
日期:2017.5.19
Dianisylamino donor (D) and dimesitylboryl acceptor (A) substituents were introduced at the 1,6- and 2,7-positions of pyrene to demonstrate that the substitution patterns influence the photophysical properties. The different pictures in orbital interactions between the pyrene core and the D–A substituents led to the outcome that 1,6-substituted pyrene derivative 1 had stronger electron-donating and
在of的1,6-位和2,7-位引入了二乙胺基氨基供体(D)和二聚二氢苄基受体(A)取代基,以证明取代方式会影响光物理性质。core核与D–A取代基之间的轨道相互作用的不同图片导致以下结果:1,6-取代的derivative衍生物1具有更强的给电子和电子接受特性以及较小的HOMO-LUMO间隙,如与2,7-取代的衍生物相比。对于这些芘衍生物,温和(Φ ˚F = 0.2)到强(Φ ˚F = 1.0)在脱气的有机溶剂中检测到的荧光; 1个表现出典型的分子内电荷转移(ICT)辐射遵循能隙定律,而2表现出中等的逆能隙定律,源于不同的取代模式。尽管理论计算预测1和2甚至在气相中都采用高度扭曲的ICT激发态(TICT激发态),但实际上,建议观察到的光物理性质可以由TICT-根据溶剂的极性类似激发态。此外,膨松d-A取代基抑制分子间的直接π-π相互作用,由此导致在明亮的和中度固态排放1(Φ ˚F= 0.76)和2(Φ