Luminescent properties and crystal structure of novel benzanthrone dyes

Luminescence and structural properties of thermally evaporated benzanthrone dyes thin films

“…Such package allows for an efficient interaction between the p-electron of aromatic system with the neighbouring molecules of ben− zanthrone, as well as donor−acceptor interaction between nitrogen atoms and the carbonyl oxygen. In previous studies [5,14], it was shown that in other molecular crystals, pack− aging of benzanthrone derivatives demonstrated a low intensity of luminescence of these compounds in the solid state. In addition, it was found that the other studied 3−N− −derivatives of benzanthrone (with substituted amino and amidino groups) were not able to form ordered thin films.…”

“…A few peaks in the XRD diagram indicate some crys− talline of the obtained organic film, the main peak (2q = 13.97°, d = 6.34 ) and the additional peak (2q = 23.22°, d = 3.83 ). From our previous investigation of crystal structure [5] by X−ray diffraction methods, it is known that molecules in mono crystal of 3−N,N−diacetylaminobenzan− throne are packed into parallel layers showing head−to−tail arrangement. These layers are held together due to moderate p-p stacking interactions in the crystal structure between ben− zanthrone systems connected by the centre of inversion.…”

“…1) is described in Ref. 5. Organic thin films were obtained by thermal evaporation of the substance in polycrystal state onto BK−7 3×3 inch glass substrates in the vacuum of~10 -5 Torr.…”

Electronic Structures and Spectral Properties of 3-Pyrrolidinobenzanthrone

“…近年来的一些研究表明, 它的 3鄄氮取代衍生 物具有特殊的光学性质, 有望应用于新型荧光材料、 非线性光学材料和液晶显示材料等领域, 因此很多 科学家对此进行了广泛研究 [11][12][13][14] . 最近,Kirilova 等 [15] 合成了一种新型的激发态分子内电荷转移化合物-3鄄吡咯烷基苯并蒽酮, 并应用 X 射线晶体衍射实验 表征了它的结构, 研究了它的吸收和发射光谱性质, 根据它的荧光谱带定性指出 3鄄吡咯烷基苯并蒽酮 存在强烈的激发态分子内电荷转移(CT)现象. Nepra觢 等 [16] 通过 PPP鄄MO 方法研究了苯并蒽酮衍生 物的激发能和第一吸收光谱带, 并分析了基态和激 发态电子密度分布与光谱性质的联系.Kosower 等 [17]…”

“…极性溶剂中的最强吸收峰位于 470-500nm 之间, 并且随着溶剂极性的增强有着轻微的红移. 这与实 验结果 [15] 相一致. Fig.4 Emissionspectraof 3鄄pyrrolidinobenzanthrone…”