We report the synthesis, X-ray structures and photophysical properties of a few benzoylpyrene (BP) derivatives. Steric hindrance due to incremental benzoyl groups causes a systematic reduction in the orbital overlap (π–π) between vicinal pyrene units affording green-yellow-orange solid-state emitters. Crystallization induced emission could arise from: i) electronic (dipolar/excitonic) interactions, ii) arrested bond rotations, and/or iii) lack of solvation in crystalline 1–4BP (ΦFl ∼ 2–26%) when compared to that in solution (ΦFl ≤ 1%). Our earlier effort [Chem. Commun. 2014, 50, 8644] on progressive acylation, in contrast to benzoylation, results in a gradual increase in the π–π overlap between vicinal pyrenes.
我们报告了一些苯甲酰
芘 (BP) 衍
生物的合成、X 射线结构和光物理性质。增量苯甲酰基团产生的立体阻碍导致邻接
芘单元之间轨道重叠(π-π)的系统性减少,从而产生绿-黄-橙色固态发光体。结晶诱导发射的原因可能是:i) 电子(双极/外显子)相互作用,ii) 键旋转受阻,和/或 iii) 与溶液(ΦFl ≤ 1%)相比,结晶 1-4BP 缺乏溶解(ΦFl ∼ 2-26%)。与苯甲酰化不同的是,我们早先[Chem. Commun. 2014, 50, 8644]在渐进酰化方面所做的努力导致邻位
芘之间的π-π重叠逐渐增加。