silver | 12187-06-3

• 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
• 英文名称: silver
• 英文别名: silver dimer；7230-74-2 (Name error)
• CAS: 12187-06-3
• 化学式: Ag₂
• 分子量: 215.736
• InChiKey: OGFYIDCVDSATDC-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.01
• 重原子数：
  2
• 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：

  silver 、 氨 以 gaseous matrix 为溶剂， 生成
  参考文献：
  名称：

  Relativistic effects in reactions of the coinage metal dimers in the gas phase

  摘要：

  Reactions of Ag2 and Au2 with several small molecules have been studied in the gas phase, under thermalized conditions at room temperature, in a fast-flow reactor. Ag2 was observed to react only with NH3, implying bimolecular rate constants of less than 5×10−15 cm3 s−1 at 6 Torr He for reaction with O2, N2O, N2, H2, CH4, CO2, CO, and C2H4. The complex, Ag2NH3, was found to be in equilibrium with Ag2 and NH3 with an equilibrium constant of 4.6±0.3×10−15 cm3. Third law modeling of this equilibrium constant leads to a value of 58±8 kJ mol−1 for the binding energy of Ag2NH3. Au2 was not observed to react with O2, N2O, N2, and CH4, again implying bimolecular rate constants of less than 5×10−15 cm3 s−1 at 6 Torr He. Au2 reacted with CO, NH3, and C2H4 in a manner characteristic of association reactions in their low pressure limit. Limiting low-pressure, third-order, rate constants were found to be 2.6±0.9, 22±4, and 230±50×10−30 cm6 s−1, respectively. These rate constants are 3 to 20 times larger than those for corresponding Cu2 reactions. Modeling studies of these rate constants imply that the Au2 complexes are bound by 20–40 kJ mol−1 more than their Cu2 counterparts, if both the complexes of both dimers have similar molecular structure. In addition, Au2 exhibits a unique reaction amongst the coinage metal dimers in that it reacts with hydrogen via what appears to be an insertion reaction with a pressure independent rate constant of 1.4±0.3×10−14 cm3 s−1 at 297 K. Trends in the reactivity of coinage metal dimers revealed by this work and our earlier studies of Cu2 dimer reactions are discussed in terms of the role relativistic effects play in metal cluster chemistry. In particular, we remark that the anomalous chemical behavior of Au2 is consistent with other anomalies credited to relativistic effects in the physics and chemistry of gold.

  DOI：

  10.1063/1.465221
• 作为产物：
  描述：

  银 以 neat (no solvent) 为溶剂， 生成 silver
  参考文献：
  名称：

  POLYATOMIC SPECIES IN SILVER VAPOR¹

  摘要：

  DOI：

  10.1021/ja01644a072

文献信息

• Photodissociation of Cu₂NH₃ and Ag₂NH₃
  作者：S. A. Mitchell、L. Lian、D. M. Rayner、P. A. Hackett

  DOI：10.1021/jp961181n

  日期：1996.1.1

  We report on the reactions of copper and silver dimers with ammonia in the gas phase near room temperature and on photodissociation of the 1:1 complexes. Photodissociation action spectra in the range 295−360 nm and emission spectra of metal dimers produced by photodissociation are described. The binding energies of NH3 on Cu2 and Ag2 have been determined, and spectroscopic data and theoretical results

  我们报道了在室温附近的气相中铜和银二聚体与氨的反应以及1：1配合物的光解离。描述了在295-360 nm范围内的光解作用光谱和通过光解作用产生的金属二聚体的发射光谱。已经确定了NH 3在Cu 2和Ag 2上的结合能，并且光谱数据和理论结果已经用于推断配合物的准线性或端基配位几何形状。给出了键合机理的简单图片，并与吸附在铜和银原子以及整体表面上的氨进行了比较。
• Gmelin Handbuch der Anorganischen Chemie, Gmelin Handbook: Ag: MVol.A2, 18, page 152 - 154
  作者：

  DOI：——

  日期：——
• Undersaturation dependence of the evaporation rate of potassium chloride
  作者：Paul C. Nordine、Paul W. Gilles

  DOI：10.1063/1.441734

  日期：1981.5

  Theories of ledge dynamics for crystals evaporating by the stepwise mechanism predict a change from crystal edge control to dislocation control of the evaporation kinetics as the gas phase saturation is reduced. This effect was studied by measuring the rate of evaporation from the (100) face of high purity KCl crystals vs gas phase saturation with a specially designed spherical effusion cell of variable orifice area. The experiments minimized or eliminated variation in sample temperature, area, dislocation density, and purity and gave results of sufficient precision to confirm the theoretical predictions. Ledges arising from dislocations do not influence the evaporation rate of KCl if the incident to equilibrium flux ratio (Vi/Veq) exceeds 0.93±0.02, at 460 ° C. This conclusion is based on an observed change in slope of evaporation rate versus incident flux at a value of Vi/Veq consistent with the theory of stepwise evaporation and independent estimates or measurements of surface energies, surface reaction activation energies, and ledge spacings on evaporated crystals.
• High‐resolution isotope selective laser spectroscopy of Ag₂ molecules
  作者：V. Beutel、H.‐G. Krämer、G. L. Bhale、M. Kuhn、K. Weyers、W. Demtröder

  DOI：10.1063/1.464151

  日期：1993.2.15

  Silver dimers formed in a seeded supersonic argon beam are examined with two laser spectroscopic methods. Excitation fluorescence spectra of the A-X system excited with a narrow band cw dye laser yield accurate constants of the X 1Σg+ and the A 1Σu+ state. From isotope selective resonant two-photon ionization spectra of the B-X and the E-X system excited by a pulsed dye laser and monitored with a time-of-flight mass spectrometer, improved vibrational constants and rotational constants of the B 1Πu and the E 1Πu state are derived. Rotational constants of the C and the D state could be determined from the spectral separations between bandhead and band origin in partly rotationally resolved bands. Autoionizing Rydberg states of Ag2 are stepwise excited with two pulsed dye lasers in two resonant steps. From the convergence limits of different Rydberg series converging towards different vibrational levels v+ in the X 2Σg+ ground state of Ag2+ the rotational constants of the ion ground state and the adiabatic ionization potential IP(Ag2+)=61 747±4 cm−1 could be accurately determined.
• Ozin, Geoffrey A.; McCaffrey, John G.; Parnis, J. Mark, Angewandte Chemie, 1986, vol. 98, # 12, p. 1076 - 1089
  作者：Ozin, Geoffrey A.、McCaffrey, John G.、Parnis, J. Mark

  DOI：——

  日期：——