N-(1-octadecyl)-4-stilbazolium cation | 55066-97-2

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: N-(1-octadecyl)-4-stilbazolium cation
• 英文别名: 1-octadecyl-4-[(E)-2-phenylethenyl]pyridin-1-ium
• CAS: 55066-97-2
• 化学式: C₃₁H₄₈N
• 分子量: 434.729
• InChiKey: NPLISAHFBGJFLE-WCWDXBQESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  12
• 重原子数：
  32
• 可旋转键数：
  19
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.58
• 拓扑面积：
  3.9
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  N-(1-octadecyl)-4-stilbazolium cation 在 deuteriated arachidic acid film on silver 作用下， 生成 、
  参考文献：
  名称：

  Effects of Nonradiative Energy Transfer on Photodimerization of a Stilbazolium Cation on Ag and GaAs Substrates: Infrared Reflection Absorption and Emission Spectroscopic Studies

  摘要：

  Infrared reflection absorption (IRA) and fluorescence spectroscopies were applied to elucidate photodimerization processes induced by irradiation at 340 nm of stilbazolium cations (C18S) incorporated in Langmuir-Blodgett (LB) films of fully deuterated arachidic acid (DA) on the silver and GaAs substrates. A spacer layer consisting of monomolecular LB films of DA was inserted between the substrates and the mixed LB monolayers (C18S: DA = 1:4). Both the rate and the extent of photodimerization increased with the thickness of the spacer layer (d). The quantum yield of excimer fluorescence also increased with d. Analyses of these results confirmed that photodimerization proceeded through an excimer of C18S and that the reduction in the dimerization rate observed for the samples with smaller numbers of spacer layers was mainly due to an increase in the rate of nonradiative energy transfer to the substrates. The energy transfer on the GaAs substrate depended on d(-3), which conformed to a well-known classical theory based on the standard Forster-type energy transfer. On the other hand, the energy transfer rate on the silver substrate was proportional to d(-1), which did not agree with the classical theory. Change in the intensity of an excimer fluorescence band near 490 nm was observed from 15 monolayers of a mixed LB film (C18S:DA = 1:4) on a silver substrate as a function of t in the temperature range 77-320 K. Above 300 K, the intensity decreased precipitously with t, indicating the advance of photodimerization; the activation energy of the process was determined to be 28.4 kJ/mol. On the contrary, the intensity showed appreciable increase below 200 K and dimerization hardly proceeded. This phenomenon was interpreted as due to a photoinduced orientation change of C18S, resulting in a state which was more favorable for the excimer formation and hence stronger fluorescence. However, only very few excimers had thermal energy larger than the activation energy so that dimers were scarcely produced below 200 K. in the temperature range 200-300 K, the intensity at first increased and then decreased gradually; the result could be reproduced by assuming that both the orientation change and the photodimerization occurred at the same time.

  DOI：

  10.1021/j100011a037