银 | 64475-46-3

• 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
• 中文名称: 银
• 英文名称: (silver)5 cluster
• 英文别名: silver
• CAS: 64475-46-3
• 化学式: Ag₅
• 分子量: 539.341
• InChiKey: MMSVVKVPZNKRHE-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.01
• 重原子数：
  5
• 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

• 作为反应物：
  描述：

  银 在 苯 作用下， 以 gas 为溶剂， 生成
  参考文献：
  名称：

  Irion, Manfred P.; Schnabel, P.; Selinger, Adrian, Berichte der Bunsen-Gesellschaft, 1990, vol. 94, # 11, p. 1291 - 1295

  摘要：

  DOI：
• 作为产物：
  描述：

  silver perchlorate 以 甲醇 为溶剂， 生成 银
  参考文献：
  名称：

  新颖的银簇

  摘要：

  五聚体银簇Ag 5 4+是在甲醇和乙醇玻璃中以77 K制备的，其特征在于esr和光学光谱。该物种的实验参数与以前的理论研究非常吻合。

  DOI：

  10.1039/c39880001454

文献信息

• Reactions of AgI ions in alcohols after radiolysis at 77 K
  作者：Robert Janes、Andrew D. Stevens、Martyn C. R. Symons

  DOI：10.1039/f19898503973

  日期：——

  Solutions of silver perchlorate in methanol, ethanol, ethane-1,2-diol, isopropyl alcohol, allyl and propargyl alcohols have been exposed to 60Co γ-rays at 77 K and the resulting radicals studied using ESR spectroscopy. In addition to ĊH2OH solvent radicals, methanolic solutions gave AgII centres and a number of discrete Ag° species. The latter exhibited a range of hyperfine couplings, reflecting various degrees of solvation. Their relative yields were shown to vary according to initial AgI concentration and with added sodium perchlorate. After annealing to ca. 120 K, Ag° gave way to the molecular cluster cations Ag+2, Ag2+3, Ag3+4 and Ag4+5, previously identified by ESR and optical spectroscopy in a range of systems and shown to be formed by the sequential addition of AgI ions. Ag4+5 formation was favoured either by high initial AgI or high counterion (nitrate or perchlorate) concentration. During the silver aggregation process the solvent radicals (CH2OH) decayed and the adduct [Ag . CH2OH]+ was formed [Aiso(Ag)= 128 G]. On annealing to the softening point of the matrix these species were lost. No higher-nuclearity molecular centres were detected. However, a weak singlet in the free-spin region grew in. This is tentatively assigned to conduction electron spin resonance (CESR) in pseudo-metallic, Ag0n particles. On further melting the Ag0n signal disappeared and the sample became black, indicating the eventual formation of colloidal silver. Similar reactions were observed in ethanol, ethane-1,2-diol and isopropyl alcohol.The allyl alcohol system did not give any clearly defined Ag° centres, only solvent radicals being observed at 77K. Two possible silver–solvent adducts were detected after annealing, one with a larger Aiso(Ag) value than expected (ca. 360 G). Results for propargyl alcohol were similar, except that only one silver–solvent species was formed. Possible structures for these centres are discussed. When both systems were annealed to the matrix softening point, the adduct signals decayed and an isotropic singlet in the free-spin region was revealed. This signal was particularly strong in the propargyl system. The g value and linewidth are similar to values recently reported for CESR signals from Ag0n latent-image particles formed in silver halide matrices by photolysis.

  高氯酸银在甲醇、乙醇、乙二醇、异丙醇、烯丙醇和炔丙醇中的溶液在77 K下暴露于60Co γ射线，并使用ESR光谱研究了产生的自由基。除了CH2OH溶剂自由基外，甲醇溶液还产生了AgII中心和一系列离散的Ag°物种。后者显示出不同范围的超精细耦合，反映了各种程度的溶剂化。它们的相对产率根据初始AgI浓度和添加的氯酸钠而变化。在退火至约120 K后，Ag°转变为分子簇阳离子Ag+2、Ag2+3、Ag3+4和Ag4+5，这些先前已在多种系统中通过ESR和光谱学鉴定，并显示是由AgI离子的连续加成形成的。Ag4+5的形成在高初始AgI或高配体（硝酸盐或高氯酸盐）浓度下更有利。在银聚合过程中，溶剂自由基(CH2OH)衰减，形成了加合物[AgCH2OH]+ [Aiso(Ag)= 128 G]。在退火至基质软化点时，这些物种消失。未检测到更高核的分子中心。然而，自由自旋区域中出现了一个弱单重态。这被暂时归因于伪金属Ag0n粒子中的导电电子自旋共振(CESR)。在进一步熔化后，Ag0n信号消失，样品变黑，表明最终形成了银胶体。乙醇、乙二醇和异丙醇中也观察到了类似反应。烯丙醇系统未产生任何明确的Ag°中心，仅在77K下观察到溶剂自由基。退火后检测到两种可能的银-溶剂加合物，其中一种的Aiso(Ag)值比预期的大（约360 G）。炔丙醇的结果类似，只是仅形成了一种银-溶剂物种。讨论了这些中心的可能结构。当两个系统都退火至基质软化点时，加合物信号衰减，自由自旋区域中显示出各向同性单重态。这个信号在炔丙醇系统中特别强。g值和线宽与最近报道的由银卤化物基质中的光解形成的Ag0n潜影粒子的CESR信号相似。
• Gas phase studies of Zn⁺₂, Ag⁺₃, and Ag⁺₅
  作者：Steven W. Buckner、James R. Gord、Ben S. Freiser

  DOI：10.1063/1.453867

  日期：1988.3.15

  Laser desorption from ZnO and AgO produces small bare metal cluster ions. Laser desorption from a ZnO/AgO mixture produces an enhancement of the silver cluster ion signal with complete suppression of the zinc signal. The chemistry of Zn+2 indicates IP(Zn2)=9.0±0.2 eV and D0(Zn+–Zn)=0.56±0.2 eV. The reactivity of Zn+2 with alkenes and alcohols is characterized by displacement of a zinc atom and formation of Zn+–B (B=alcohol, alkene). The silver cluster ions are produced with excess kinetic energy; however, collisional cooling is achieved by trapping the cluster ions in a static pressure of argon. Charge transfer reactions indicate IP(Agn)<7.0 eV (n=3,5). Ag+3 and Ag+5 are unreactive with small alkanes, alkenes, and alcohols, but AgnL+2 (n=3,5; L=sec-butylamine) reacts with sec-butylamine via deamination and dehydrogenation indicating D0 (AgnL+2–butadiene) >1.73 eV.
• Silver clusters in rare gas matrixes. Thermal and photochemical silver atom aggregation reactions
  作者：Steven A. Mitchell、Geoffrey A. Ozin

  DOI：10.1021/j150651a039

  日期：1984.3
• The optical absorption spectra of small silver clusters (n=5–11) embedded in argon matrices
  作者：W. Harbich、S. Fedrigo、J. Buttet

  DOI：10.1016/0009-2614(92)85572-r

  日期：1992.7

  The optical absorption of small mass selected Ag(n) clusters (n = 5, 7, 8, 9, 11) embedded in solid Ar has been measured. Strong absorption has been found between 3 and 4.5 eV. The absorption spectra show 1-3 major peaks depending on the cluster size. The width of these peaks is considerably smaller than commonly found in gas phase photodepletion experiments. A simple model based on a Drude metal, and neglecting the dielectric constant of the surrounding medium, gives satisfactory agreement with experiment.
• Rabin, I.; Jackschath, C.; Schulze, W., Zeitschrift für Physikalische Chemie, <hi>1990</hi>, vol. 169, # 1, p. 93 - 100
  作者：Rabin, I.、Jackschath, C.、Schulze, W.

  DOI：——

  日期：——