DMAB | 956605-94-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯硫酚类
• 英文名称: DMAB
• 英文别名: p,p'-dimercaptoazobenzene；4,4'-dimercaptoazobenzene；p,p’-dimercaptoazobenzene；4,4′-dimercapto azobenzene；4,4’-dimercaptoazobenzene；p,p′-dimercaptoazobenzene；4,4'-Dimercaptoazobenzene；4-[(4-sulfanylphenyl)diazenyl]benzenethiol
• CAS: 956605-94-0
• 化学式: C₁₂H₁₀N₂S₂
• 分子量: 246.357
• InChiKey: KLFJLNIJCQENDQ-UHFFFAOYSA-N

物化性质

• 熔点：
  127.8 °C
• 沸点：
  426.5±30.0 °C(Predicted)
• 密度：
  1.25±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.4
• 重原子数：
  16
• 可旋转键数：
  2
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  26.7
• 氢给体数：
  2
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  bis-(4-iodo-phenyl)-diazene 在 magnesium 、 sulfur 作用下， 以 四氢呋喃 为溶剂， 反应 24.0h， 生成 DMAB
  参考文献：
  名称：

  When the Signal Is Not from the Original Molecule To Be Detected: Chemical Transformation of para-Aminothiophenol on Ag during the SERS Measurement

  摘要：

  Surface-enhanced Raman spectroscopy (SERS) has long been considered as a noninvasive technique that can obtain the fingerprint vibrational information of surface species. We demonstrated in this paper that a laser with a power level considered to be low in the traditional SERS measurement can already lead to a significant surface reaction. para-Aminothiophenol, an important probe molecule in SERS, was found to be oxidized to form 4,4'-dimercaptoazobenzene (DMAB) on a roughened silver surface during the SERS measurement. The assumption was confirmed experimentally by surface mass spectroscopy and SERS as well as electrochemistry of the synthesized DMAB, which agrees well with theoretical calculations. A defocusing method was used to avoid the laser induced surface reaction and perform reliable SERS characterization and identification, which can effectively avoid erroneous interpretation of the distorted experimental result.

  DOI：

  10.1021/ja101107z

文献信息

• Synthesis of a Gold–Metal Oxide Core–Satellite Nanostructure for In Situ SERS Study of CuO‐Catalyzed Photooxidation
  作者：Kaifu Zhang、Ling Yang、Yanfang Hu、Chenghao Fan、Yaran Zhao、Lu Bai、Yonglong Li、Faxing Shi、Jun Liu、Wei Xie

  DOI：10.1002/ange.202007462

  日期：2020.10.5

  AbstractThis work reports on an assembling–calcining method for preparing gold–metal oxide core–satellite nanostructures, which enable surface‐enhanced Raman spectroscopic detection of chemical reactions on metal oxide nanoparticles. By using the nanostructure, we study the photooxidation of Si−H catalyzed by CuO nanoparticles. As evidenced by the in situ spectroscopic results, oxygen vacancies of CuO are

  摘要这项工作报告了一种制备金-金属氧化物核-卫星纳米结构的组装-煅烧方法，该方法能够对金属氧化物纳米颗粒上的化学反应进行表面增强拉曼光谱检测。通过使用纳米结构，我们研究了 CuO 纳米粒子催化的 Si−H 光氧化。原位光谱结果表明，CuO的氧空位是氧活化的非常活跃的位点，而吸附在催化位点的氢氧自由基（*OH）很可能是引发从硅烷转化为硅烷的反应中间体。相应的硅烷醇。根据我们的发现，富氧空位的 CuO 催化剂被证实在各种硅烷的光氧化中具有高活性和选择性。
• Surfactant directed Ag 1−x Ni x alloy nanoparticle catalysed synthesis of aromatic azo derivatives from aromatic amines
  作者：Mukesh Kumar、Kiran Soni、Geeta Devi Yadav、Surendra Singh、Sasanka Deka

  DOI：10.1016/j.apcata.2016.06.039

  日期：2016.9

  catalyst are observed and investigated by several instrumental techniques. The key to the effective process is found to be size effect, electronic effect and structural defect, and the presence of surfactant at the surfaces of the AgNi MTANP catalyst.

  双金属和多重孪晶的Ag 1-x Ni x（x = 0.2、0.4、0.6、0.8）合金纳米颗粒（MTANP）首次作为芳香族胺向工业上重要的反应转化中的有效多相催化剂而被研究。对称或不对称的偶氮苯通过需氧分子氧的活化。在这里，我们证明了合成和优化后的Ag 0.6 Ni 0.4合金NPs在催化性能方面显示出突破性进展，可在有氧绿色反应条件下实现定量的芳香胺转化和在偶氮苯中的绝对选择性（100％），而无需使用对环境不利的亚硝酸盐和任何其他有害物质。通过几种仪器技术观察和研究了催化剂的高稳定性和可回收性。发现有效方法的关键是尺寸效应，电子效应和结构缺陷，以及在AgNi MTANP催化剂表面存在表面活性剂。
• Photothermally Enhanced Plasmon-Driven Catalysis on Fe₅ C₂ @Au Core-Shell Nanostructures
  作者：Peng Miao、Wei Huang、Mansha Gao、Jiayu Chu、Bo Song、Ping Xu

  DOI：10.1002/cctc.201701901

  日期：2018.3.7

  much accelerated reaction kinetics can be achieved on the Fe5C2@Au core–shell nanostructures by quantitatively determining the Raman intensity of the ν(N=N) band in the generated 4,4′‐dimercaptobenzene (DMAB). The photothermal effect from the Fe5C2 NPs may lower the energy barrier and generate more hot electrons for the plasmon‐driven catalysis. This photothermal route may open up new avenues for enhancing

  等离子体驱动的催化法近年来引起了极大的关注，但反应效率仍有待提高。Fe 5 C 2 @Au光热核壳纳米结构是通过在己硫醇的帮助下通过Fe 5 C 2和Au纳米颗粒（NPs）的自组装过程制备的，这可以是高效的表面增强拉曼光谱（SERS）平台，对4-氨基硫代苯酚（4-ATP）和4-硝基硫代苯酚（4-NTP）的等离激元驱动的二聚化的研究。与裸金纳米粒子相比，通过定量确定ν的拉曼强度，可以在Fe 5 C 2 @Au核-壳纳米结构上获得大大加速的反应动力学。生成的4,4'-二巯基苯（DMAB）中的（N = N）带。Fe 5 C 2 NPs的光热效应可能会降低能垒，并为等离激元驱动的催化反应产生更多的热电子。这种光热途径可能为提高反应速率和扩大等离激元驱动的催化研究领域开辟新途径。
• Bi-functional reduced graphene oxide/AgCo composite nanosheets: an efficient catalyst and SERS substrate for monitoring the catalytic reactions
  作者：Xiaowei Ma、Yue Guo、Jing Jin、Bing Zhao、Wei Song

  DOI：10.1039/c7ra07216c

  日期：——

  nanoparticles is important in the fields of catalysis and surface-enhanced Raman scattering (SERS) detection. In this work, a simple in situ co-reduction approach has been demonstrated for the synthesis of AgCo alloy nanoparticles with a size of 20–100 nm supported on the surface of reduced graphene oxide (rGO) nanosheets. The resulting rGO/AgCo composite nanosheets are well characterized using scanning electron

  负载型单分散双金属纳米颗粒的制备在催化和表面增强拉曼散射（SERS）检测领域中很重要。在这项工作中，已经证明了一种简单的原位共还原方法，可合成还原氧化石墨烯（rGO）纳米片的表面上载有尺寸为20–100 nm的AgCo合金纳米颗粒。使用扫描电子显微镜（SEM），透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR），拉曼光谱，X射线衍射（XRD）和X射线光电子显微镜对得到的rGO / AgCo复合纳米片进行了很好的表征（XPS）测量。制备的rGO / AgCo复合纳米片在NaBH存在下显示出优异的催化活性，可还原亚甲基蓝（MB）4和rGO / Ag，rGO / Co，rGO / Ag 3 Co 1和rGO / Ag 1 Co 3在紫外光下的MB降解复合纳米片。此外，rGO / AgCo复合纳米片也被证明是有效的表面增强拉曼散射（SERS）衬底。rGO和AgCo合金纳米颗粒之间独特的二维结
• On the effect of <scp> TiO ₂ </scp> nanocrystallites over the plasmonic photodegradation by <scp>Au</scp> nanoparticles
  作者：Jiale Wang、Eduardo C.M. Barbosa、Zebo Fang、André L.A. Parussulo、Flavia V.E. Reis、Rômulo A. Ando、Koiti Araki、Henrique E. Toma、Pedro H.C. Camargo

  DOI：10.1002/jrs.5492

  日期：2018.12

  In this paper, we aimed at investigating the effect of the presence of small TiO2 crystallites over the transfer of hot electrons from Au nanoparticles (NPs) mediated by the surface plasmon resonance (SPR) excitation and its subsequent photocatalytic activities. To this end, we employed TiO2 colloidal spheres composed of TiO2 crystallites of 8.5 nm in size decorated with Au NPs (TiO2–Au) of 17 nm in size over the TiO2 surface as model materials. Moreover, the photocatalytic degradation of methylene blue (MB) under visible light excitation was employed as a target plasmonic transformation. We found that the plasmonic photocatalytic activity was significantly higher for the TiO2–Au hybrid relative to its individual Au NPs or TiO2 counterparts under excitation at 633 nm. These results could be explained based on the transfer of hot electrons generated upon the SPR excitation from Au NPs to the TiO2 conduction band in the TiO2–Au material, which will be recombined on the surface of TiO2 crystallites or at the interface between TiO2 crystallites, decreasing electrons density in Au NPs that lead to the formation of hydroxyl radicals that contribute and improve the photocatalytic degradation of MB. This mechanism was supported by the fact that the presence of TiO2 leads to a decrease in the p-aminothiophenol to p,p′-dimercaptoazobenzene SPR-mediated oxidation in the TiO2–Au relative to Au NPs. We believe that the results reported herein suggest that TiO2–Au materials may represent attractive systems for designing plasmonic photocatalysts with improved performances towards a variety of transformations using solar/visible light as the energy input.

  本文旨在研究小 TiO2 晶体的存在对由表面等离子体共振 (SPR) 激发的金纳米粒子 (NPs) 热电子转移及其后续光催化活性的影响。为此，我们采用了由尺寸为 8.5 nm 的 TiO2 晶体和尺寸为 17 nm 的金纳米粒子（TiO2-Au）组成的 TiO2 胶体球作为模型材料。此外，我们还将可见光激发下亚甲基蓝（MB）的光催化降解作为等离子体转化的目标。我们发现，在 633 纳米波长的激发下，TiO2-Au 杂化物的等离子光催化活性明显高于其单个 Au NPs 或对应的 TiO2。这些结果可以解释为在 SPR 激发下，Au NPs 中产生的热电子转移到了 TiO2-Au 材料中的 TiO2 传导带，这些电子将在 TiO2 晶体表面或 TiO2 晶体之间的界面上重新结合，降低 Au NPs 中的电子密度，从而形成羟基自由基，促进和改善甲基溴的光催化降解。相对于 Au NPs，TiO2-Au 的存在导致对氨基苯硫酚到 p,p′-二巯基偶氮苯 SPR 介导的氧化作用降低，这一事实证明了上述机制。我们认为，本文报告的结果表明，TiO2-Au 材料可能是设计等离子体光催化剂的有吸引力的系统，它能改善以太阳光/可见光为能量输入的各种转化的性能。