2-[4'-(Dimethylamino)phenylazo]benzoic acid methyl ester | 144182-36-5

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 偶氮苯
• 英文名称: 2-[4'-(Dimethylamino)phenylazo]benzoic acid methyl ester
• 英文别名: Methyl-2-(4'-dimethylaminophenylazo)benzoate
• CAS: 144182-36-5
• 化学式: C₁₆H₁₇N₃O₂
• 分子量: 283.33
• InChiKey: RTDXWXNFMAYVMS-ISLYRVAYSA-N

物化性质

• 沸点：
  438.7±30.0 °C(Predicted)
• 密度：
  1.11±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.95
• 重原子数：
  21.0
• 可旋转键数：
  4.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.19
• 拓扑面积：
  54.26
• 氢给体数：
  0.0
• 氢受体数：
  5.0

反应信息

• 作为产物：
  描述：

  甲醇 、 methyl red 在 硫酸 作用下， 生成 2-[4'-(Dimethylamino)phenylazo]benzoic acid methyl ester
  参考文献：
  名称：

  Change of Internal Hydrogen Bonding of Methyl Red upon Photoisomerization Monitored by Forced Rayleigh Scattering

  摘要：

  A nonmonotonic, decay-growth-decay type forced Rayleigh scattering (FRS) decay profile was observed in the study of methyl red to-MR) diffusion in polymer solutions in which the carboxylic hydrogen of o-MR can form a hydrogen bond with polymer chain segments (Lee and Lodge, J. Phys. Chern. 1987, 91, 5546; Lee et al. Macromolecules 1992, 25, 6977). The diffusivities of ground state o-MR (trans form) and of its photoexcited isomer (cis form) are different enough to show the nonmonotoic decay profile, but the origin of the behavior has not been fully understood. In order to elucidate this observation, the dependence of the decay profile shape on polymer concentration as well as on tempreature was investigated by FRS. From the results, we propose that the internal hydrogen-bonding strength between the carboxylic hydrogen and the azo nitrogen in o-MR changes upon photoisomerization from the trans to cis form, which results in the different diffusivities of the two isomers in hydrogen-bonding media. This proposition is supported by ab initio calculations on the molecular structure of o-MR.

  DOI：

  10.1021/jp9838442