gold;silver | 11126-80-0

• 分子结构分类: 无机化合物 - 均相金属化合物 - 均相过渡金属化合物
• 英文名称: gold;silver
• CAS: 11126-80-0
• 化学式: Ag₂Au
• 分子量: 412.703
• InChiKey: VSJHLSICKOBBBI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.01
• 重原子数：
  3
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为产物：
  描述：

  gold 、 silver nitrate 在 维生素 C 作用下， 以 水 、 乙腈 为溶剂， 反应 0.17h， 生成 gold;silver
  参考文献：
  名称：

  Fully Alloyed Ag/Au Nanospheres: Combining the Plasmonic Property of Ag with the Stability of Au

  摘要：

  We report that fully alloyed Ag/Au nanospheres with high compositional homogeneity ensured by annealing at elevated temperatures show large extinction cross sections, extremely narrow bandwidths, and remarkable stability in harsh chemical environments. Nanostructures of Ag are known to have much stronger surface plasmon resonance than Au, but their applications in many areas have been very limited by their poor chemical stability against nonideal chemical environments. Here we address this issue by producing fully alloyed Ag/Au nanospheres through a surface-protected annealing process. A critical temperature has been found to be around 930 degrees C, below which the resulting alloy nanospheres, although significantly more stable than pure silver nanoparticles, can still gradually decay upon extended exposure to a harsh etchant. Nanospheres annealed above the critical temperature show a homogeneous distribution of Ag and Au, minimal crystallographic defects, and the absence of structural and compositional interfaces, which account for the extremely narrow bandwidths of the surface plasmon resonance and may enable many plasmonic applications with high performance and long lifetime, especially for those involving corrosive species.

  DOI：

  10.1021/ja502890c

文献信息

• Green synthesis and applications of Au–Ag bimetallic nanoparticles
  作者：M. Meena Kumari、John Jacob、Daizy Philip

  DOI：10.1016/j.saa.2014.08.079

  日期：2015.2

  This paper reports for the first time the synthesis of bimetallic nanoparticles at room temperature using the fruit juice of pomegranate. Simultaneous reduction of gold and silver ions in different molar ratios leads to the formation of alloy as well as core–shell nanostructures. The nanoparticles have been characterized using UV–vis spectroscopy, transmission electron microscopy, Fourier Transform

  本文首次报道了使用石榴汁在室温下合成双金属纳米颗粒的方法。同时减少不同摩尔比的金和银离子会导致合金以及核-壳纳米结构的形成。使用紫外可见光谱，透射电子显微镜，傅立叶变换红外光谱和X射线衍射对纳米颗粒进行了表征。合成的合金颗粒在2-，3-，4-硝基苯酚还原成相应的胺以及甲基橙的降解中用作催化剂。所有反应的还原动力学遵循伪一级。速率常数遵循k 4-硝基苯酚 <  k 2-硝基苯酚 < k 3-硝基苯酚。测量作为体积分数的函数的热导率，并且观察到合金纳米颗粒的掺入提高了显示出纳米流体应用的基础流体（水）的热导率。纳米颗粒显示的一氧化氮和羟基自由基清除活性有望在生物医学领域中应用。
• Comparative Study on Antibacterial Activity of Metal Ions, Monometallic and Alloy Noble Metal Nanoparticles Against Nosocomial Pathogens
  作者：Larkins Ramteke、Poonam Gawali、B. L. Jadhav、B. A. Chopade

  DOI：10.1007/s12668-020-00771-9

  日期：2020.12

  Unbeatable widespread antimicrobial resistance in nosocomial pathogens is a major public health concern in hospitals. In the present study, aqueous stem extract of C. tagal (CTSE) is used as a bioreducing agent for synthesis of various monometallic and alloy nanoparticles. Nanoparticle formation was dependent on time, temperature, and metal salts’ concentration. UV-Visible spectroscopy demonstrated peaks at 444 and 556 nm for silver and gold nanoparticles, respectively, while both alloy Ag–Au nanoparticles exhibited peaks at 535 nm. Transmission electron microscopy (TEM), X-ray diffraction (XRD), and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy results revealed shape, size, and involvement of functional groups in formation of stable nanoparticles. Further, minimum inhibitory concentration (MIC) of two metal ions, four monometallic nanoparticles, and two alloy noble metal nanoparticles was evaluated against nosocomial pathogens. Silver nanoparticles synthesized from AgNO3 and Ag2SO4 exhibited cytotoxicity against all tested microorganisms. Alloy (Ag–Au) nanoparticles from salts of silver nitrate and gold were more effective than alloy nanoparticles prepared from salts of silver sulfate and gold. However, gold and copper nanoparticles were effective only against Staphylococcus aureus and Escherichia coli respectively. Ionic silver was more cytotoxic as compared to copper ions and monometallic and alloy nanoparticles. This is the first report on comparative antimicrobial activity of metal ions and various nanoparticles synthesized from CTSE against nosocomial pathogens from the intensive care unit (ICU) and burn wound intensive care unit (BWICU).

  医院病原体中普遍存在的无与伦比的抗药性是医院公共卫生领域的一大问题。在本研究中，将C. tagal的水性茎提取物（CTSE）用作生物还原剂，用于合成各种单金属和合金纳米粒子。纳米粒子的形成取决于时间、温度和金属盐的浓度。紫外可见光谱显示，银和金纳米粒子的峰值分别在444和556纳米，而Ag-Au合金纳米粒子在535纳米处出现峰值。透射电子显微镜（TEM）、X射线衍射（XRD）和衰减全反射傅立叶变换红外（ATR-FTIR）光谱的结果揭示了稳定纳米粒子形成过程中的形状、大小和官能团参与情况。此外，还评估了两种金属离子、四种单金属纳米粒子和两种合金贵金属纳米粒子的最小抑菌浓度（MIC）对医院病原体的抑制作用。由AgNO3和Ag2SO4合成的银纳米粒子对所有测试微生物均表现出细胞毒性。由硝酸银和金盐合成的合金（Ag-Au）纳米粒子比由硫酸银和金盐合成的合金纳米粒子更有效。然而，金和铜纳米粒子仅分别对金黄色葡萄球菌和大肠杆菌有效。与铜离子以及单金属和合金纳米粒子相比，离子银更具细胞毒性。这是首次报道金属离子和由CTSE合成的各种纳米粒子对重症监护室（ICU）和