4-(2,5-dimethoxyphenylethynyl)-2,5-dimethoxybromobenzene | 1070162-89-8

• 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: 4-(2,5-dimethoxyphenylethynyl)-2,5-dimethoxybromobenzene
• CAS: 1070162-89-8
• 化学式: C₁₈H₁₇BrO₄
• 分子量: 377.235
• InChiKey: CDBIOPWGLVXVOE-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.88
• 重原子数：
  23.0
• 可旋转键数：
  4.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.22
• 拓扑面积：
  36.92
• 氢给体数：
  0.0
• 氢受体数：
  4.0

反应信息

• 作为反应物：
  描述：

  4-(2,5-dimethoxyphenylethynyl)-2,5-dimethoxybromobenzene 在 bis-triphenylphosphine-palladium(II) chloride 、 氢氧化钾 、 copper(l) iodide 、 三乙胺 作用下， 以 四氢呋喃 、 甲醇 、 氯仿 为溶剂， 反应 22.0h， 生成 1-((2,5-dimethoxyphenyl)ethynyl)-4-((4-ethynyl-2,5-dimethoxyphenyl)ethynyl)-2,5-dimethoxybenzene
  参考文献：
  名称：

  供体和受体组对棒状 π 共轭系统的发光效率调节

  摘要：

  鉴于高效发光材料在化学、生物科学和材料科学中的重要性日益增加，我们研究了棒状低聚（对亚苯基乙炔）（OPE，三聚体到五聚体系统）的发光效率调节) 由供体和受体基团组成，因此它们在 460 nm 作为所需波长区域发出非常强烈的荧光（Phif 约为 1.0，log epsilon 约为 5）。这一目标是通过 MeO（供体）基团的侧向改性和 CN 取代的苯环或 CF3 取代的吡啶环（受体）对四聚对亚苯基乙炔基棒状分子（Phif = 0.96，λem = 458）的末端改性实现的nm，前者的 log epsilon = 4.96，Phif = 0.99，lambdaem = 459 nm，后者的 log epsilon = 4.92）。11 和 12 的高 Phif 值用 kr（辐射速率常数）和 kd（无辐射速率常数）来解释。首次发现Phif与Hammett sigma常数之间呈正斜率的线性关系。发现

  DOI：

  10.1021/ja051588i
• 作为产物：
  描述：

  [(2,5-二甲氧基苯基)乙炔基]三甲基硅烷 在 bis-triphenylphosphine-palladium(II) chloride 、 氢氧化钾 、 copper(l) iodide 、 三乙胺 作用下， 以 四氢呋喃 、 甲醇 、 氯仿 为溶剂， 反应 7.5h， 生成 4-(2,5-dimethoxyphenylethynyl)-2,5-dimethoxybromobenzene
  参考文献：
  名称：

  供体和受体组对棒状 π 共轭系统的发光效率调节

  摘要：

  鉴于高效发光材料在化学、生物科学和材料科学中的重要性日益增加，我们研究了棒状低聚（对亚苯基乙炔）（OPE，三聚体到五聚体系统）的发光效率调节) 由供体和受体基团组成，因此它们在 460 nm 作为所需波长区域发出非常强烈的荧光（Phif 约为 1.0，log epsilon 约为 5）。这一目标是通过 MeO（供体）基团的侧向改性和 CN 取代的苯环或 CF3 取代的吡啶环（受体）对四聚对亚苯基乙炔基棒状分子（Phif = 0.96，λem = 458）的末端改性实现的nm，前者的 log epsilon = 4.96，Phif = 0.99，lambdaem = 459 nm，后者的 log epsilon = 4.92）。11 和 12 的高 Phif 值用 kr（辐射速率常数）和 kd（无辐射速率常数）来解释。首次发现Phif与Hammett sigma常数之间呈正斜率的线性关系。发现

  DOI：

  10.1021/ja051588i

文献信息

• Rigid Molecular Architectures That Comprise a 1,3,5-Trisubstituted Benzene Core and Three Oligoaryleneethynylene Arms:  Light-Emitting Characteristics and π Conjugation between the Arms
  作者：Yoshihiro Yamaguchi、Takanori Ochi、Satoshi Miyamura、Takahiro Tanaka、Shigeya Kobayashi、Tateaki Wakamiya、Yoshio Matsubara、Zen-ichi Yoshida

  DOI：10.1021/ja057751r

  日期：2006.4.1

  In view of increasing interest in light-emitting materials, we have investigated the light-emitting characteristics and occurrence of conjugation between arms of star-shaped rigid molecules that comprise a 1,3,5-triethynylbenzene core and methoxy group-substituted oligo(p-phenylethynylene) arms. Consequently, we achieved the ultimate goal (Phif approximately 1.0, log epsilon > 5) for organic molecules with respect to light-emitting ability by creating very intense violet-blue (8, Phif = 0.97, log epsilon = 5.11) and blue (9, Phif = 0.98, log epsilon = 5.29) bright light-emitters. Also, pi conjugation was found to occur between the arms of 9 despite the meta-substituted system. We found a linear relationship of kr (with positive slope) and kd (with negative slope) with the number of dimethoxyphenyleneethynylene units for MMPT (4, 6, 8) and DMPT (5, 7, 9) homologues and the contrasting solvent effect on lambdaem of 8 and 9. It is also interesting that lambdaabs, epsilon, lambdaem, and Phif of 9 are greater than those of the corresponding banana- and rod-shaped molecules.
• How the π Conjugation Length Affects the Fluorescence Emission Efficiency
  作者：Yoshihiro Yamaguchi、Yoshio Matsubara、Takanori Ochi、Tateaki Wakamiya、Zen-ichi Yoshida

  DOI：10.1021/ja8040493

  日期：2008.10.22

  How the pi conjugation length affects the fluorescence emission efficiency is elucidated by examination of the theoretical and experimental relationship between absolute quantum yield (Phi(f)) and magnitude (Api) of the pi conjugation length in the excited singlet state, which provides a novel concept for molecular design for highly fluorescent organic compounds. As a tool to predict Phi(f) from a structural model, (nu(a) - nu(f))1/2 x a3/2 (nu(a): wavenumber of absorption maximum, nu(f): wavenumber of emission maximum, a: molecular radius) could be used instead of Api. The concept should be valuable for potential applications to (1) examination of an excited singlet state structure (for example, coplanarity of excited-state molecules) and (2) molecular design of novel materials, in which the excited singlet state plays an important role, such as highly efficient fluorophores, electroluminescent materials, photoconducting materials, and nonlinear optical materials. A remarkably intense green fluorophore (Phi(f) 0.88, log epsilon 4.72, lambda(em) 527 nm) is created based on this concept, which is of great interest in relation to a green fluorescent protein (Topaz, T203Y type, Phi(f) 0.60, log epsilon 4.98, lambda(em) 527 nm).