series of rigidified tri-, penta- and heptamethine merocyaninedyes were synthesised. A piperidyl moiety was chosen as the electron-donating substituent while the electron-accepting group was varied from ketones to malononitriles and cyanoacetates. The structures of the compounds in the solid state and in solution were elucidated by X-ray diffraction and NMR spectroscopy, respectively, while optical properties
Fluorophobic Effect Promoting Lamellar Self-Assembly of Donor Acceptor Dyes
作者:Johannes Christian Haenle、Yannick Stöckl、Robert Forschner、Elena Haenle、Sabine Laschat
DOI:10.1002/cphc.201800449
日期:2018.10.19
for the first time in donor acceptor dyes. Thus, a series of mono‐, bi‐, and tricyclic donor acceptor dyes with 1H,1H‐perfluorinated alkyl chains of different lengths as donor units and nitrile, malononitrile or barbiturate as acceptorunits was synthesized in 5 steps and 1.4–6.6 % overall yield. UV/Vis and fluorescence spectroscopy, cyclic voltammetry and DFTcalculations revealed that absorption and
Merging liquid crystalline self-assembly and linear optical properties of merocyanines <i>via</i> tailored donor units
作者:Philipp Ehni、Soeren M. Bauch、Patrick M. Becker、Wolfgang Frey、Anna Zens、Johannes Kästner、Yann Molard、Sabine Laschat
DOI:10.1039/d2cp02237k
日期:——
For merocyanines with O-donor, fluorinated side chains were mandatory to get stable enantiotropic SmA phases regardless of chromophore size, side chain lengths or acceptor unit. Increased mesophase widths (up to 134 K) were observed upon increasing the chromophorelengths, chain lengths (up to C12) and F/C ratio in the side chain. On the other hand, merocyanines with N-donor and keto acceptor showed
针对具有良好线性光学和自组装性能的部花青染料,采用收敛法制备了一系列具有O-和N-供体单元以及酮基或丙二腈受体单元的刚性单环、双环和三环部花青。特别关注定制供体单元,研究了选择合适的衍生物在溶液和本体中的染料特性(UV/Vis、荧光、温度依赖性荧光、寿命)。荧光量子产率的测定揭示了供体单元和发色团大小的重要性。较大的发色团和N供体有利于溶液中的强发射,而较小的发色团和O- 捐助者倾向于固态发射。为了根据供体单元合理化不同的光学特性,进行了密度泛函理论 (DFT) 计算。还通过光学偏振显微镜、差示扫描量热法和 X 射线衍射实验研究了液晶衍生物。对于具有O供体的部花青,无论生色团大小、侧链长度或受体单元如何,都必须使用氟化侧链才能获得稳定的对映 SmA 相。在增加侧链中的生色团长度、链长度(最高 C 12)和 F/C 比时,观察到中间相宽度增加(最高 134 K)。另一方面,部花青与N-供体和
Jones, J. Bryan; Dodds, David R., Canadian Journal of Chemistry, 1987, vol. 65, p. 2397 - 2404
作者:Jones, J. Bryan、Dodds, David R.
DOI:——
日期:——
Nasipuri,D. et al., Journal of the Indian Chemical Society, 1966, vol. 43, p. 383 - 390