silver trimer

• 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 trimer
• 英文别名: silver
• 化学式: Ag₃
• 分子量: 323.605
• InChiKey: GAILCHAIZQKEGP-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

• 作为反应物：
  描述：

  silver trimer 以 neat (no solvent) 为溶剂， 生成 trisilver(1+)
  参考文献：
  名称：

  The relaxation from linear to triangular Ag3 probed by femtosecond resonant two-photon ionization

  摘要：

  We present extended NeNePo (negative to neutral to positive) measurements on the ultrafast dynamics in the ground state of neutral, mass-selected Ag3 molecules. A vibrational wave packet in the neutral molecule is created with an ultrashort laser pulse by photodetachment of the excess electron from the corresponding mass-selected anion. The subsequent molecular rearrangement is probed by photoionization after a selected time delay. Complementary to our previous investigations of this process, we now use two-photon photoionization via a resonant state in the probe step. Here, a bound–bound excitation to a well-known state followed by one-photon ionization is used instead of the nonresonant bound/free transition into the ionic continuum. Using radiation with wavelengths near 370 nm for resonant ionization, we observe a fast bending motion of the initially linear Ag3, followed by an ultrafast intramolecular vibrational energy redistribution, interpretable as an intramolecular collision process. The signal shows an apparent loss of vibrational coherence after the collision, which can be explained by the finite temperature of the anionic clusters in our experiment. Additionally, we describe a previously unknown resonance in the linear neutral molecule around 500 nm.

  DOI：

  10.1063/1.479382
• 作为产物：
  描述：

  银 在 氙气 作用下， 以 neat (no solvent) 为溶剂， 生成 silver trimer
  参考文献：
  名称：

  The relaxation from linear to triangular Ag3 probed by femtosecond resonant two-photon ionization

  摘要：

  We present extended NeNePo (negative to neutral to positive) measurements on the ultrafast dynamics in the ground state of neutral, mass-selected Ag3 molecules. A vibrational wave packet in the neutral molecule is created with an ultrashort laser pulse by photodetachment of the excess electron from the corresponding mass-selected anion. The subsequent molecular rearrangement is probed by photoionization after a selected time delay. Complementary to our previous investigations of this process, we now use two-photon photoionization via a resonant state in the probe step. Here, a bound–bound excitation to a well-known state followed by one-photon ionization is used instead of the nonresonant bound/free transition into the ionic continuum. Using radiation with wavelengths near 370 nm for resonant ionization, we observe a fast bending motion of the initially linear Ag3, followed by an ultrafast intramolecular vibrational energy redistribution, interpretable as an intramolecular collision process. The signal shows an apparent loss of vibrational coherence after the collision, which can be explained by the finite temperature of the anionic clusters in our experiment. Additionally, we describe a previously unknown resonance in the linear neutral molecule around 500 nm.

  DOI：

  10.1063/1.479382

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。
• Dynamics of O2 photodesorption from metal clusters: A significant difference from bulk behaviour
  作者：Marco Niemietz、Kiichirou Koyasu、Gerd Ganteför、Young Dok Kim

  DOI：10.1016/j.cplett.2007.03.016

  日期：2007.4

  size-selected AgnO2- cluster anions with n = 2, 3, 4 and 8 was studied using time-resolved photoelectron spectroscopy (TR-PES). The spectra indicate that relaxations of photo-excited AgnO2- clusters with n = even numbers accompany ultrafast direct O2 photodesorption. For the odd-numbered cluster Ag3O2-, in contrast, a long-lived excited state is observed, since O2 might be dissociatively chemisorbed, suppressing

   使用时间分辨光电子能谱（TR-PES）研究了n = 2、3、4和8的大小选定的AgnO2-团簇阴离子对O 2的光解吸。光谱表明，n  =偶数的光激发AgnO2-团簇的弛豫伴随着超快速直接O 2光解吸。相反，对于奇数簇Ag 3 O 2-，观察到长寿命的激发态，因为O 2可能被解离性化学吸附，从而抑制了氧气的直接光解吸。这两种，直接解吸和长寿命 从被吸附物覆盖的金属表面还没有观察到激发态，表明这种小团簇具有独特的光化学性质。
• Fragmentation and ion-scattering in the low-energy collisions of small silver cluster ions (Agn+: n=1−4) with a highly oriented pyrolytic graphite surface
  作者：Yutaka Tai、Wataru Yamaguchi、Yutaka Maruyama、Kazuki Yoshimura、Junichi Murakami

  DOI：10.1063/1.1287658

  日期：2000.9

  has been found: The intact scattered cluster ion was observed for Ag3+ while only fragment ions for Ag4+. From the incident energy dependence of fragment ion intensities, it was deduced that internal energies of the scattered parent ions have upper and lower limits. These limitations are probably due to the adsorption and the implantation of the projectile clusters on the surface. Ion-scattering yield

  通过采用串联飞行时间质量，研究了 Agn+ (n=1-4) 与高取向热解石墨 (HOPG) 表面的低能量 (0-200 eV) 碰撞中的碎裂和离子散射过程光谱仪。发现分散簇离子的碎裂是由于所研究的能量范围内的单分子解离所致。已发现入射 Ag3+ 和 Ag4+ 的碎片模式之间存在显着差异：Ag3+ 观察到完整的分散簇离子，而 Ag4+ 仅观察到碎片离子。由碎片离子强度对入射能量的依赖性，推导出散射母离子的内能有上限和下限。这些限制可能是由于表面上的弹丸簇的吸附和植入。发现离子散射产率随着簇大小的增加而增加。离子散射产率的入射能量和簇大小依赖性均通过模型计算重现...
• 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.
• Absorption spectrum of the trimer silver cluster <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" display="inline" overflow="scroll"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Ag</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math> and metal nanoparticles in microemulsion
  作者：Sudhir Kapoor、Ravi Joshi、Tulsi Mukherjee

  DOI：10.1016/j.cplett.2004.08.080

  日期：2004.10

  Classical quantum simulation suggests the formation of Ag-3(2+) [Chem. Phys. Lett. 389 (2004) 150]. We present the effect of water pool radii on the transient absorption spectra of initial silver clusters. Experimental evidence for the formation of Ag-3(2+) in micro-emulsion system is reported for the first time. The surface plasmon absorption band of stable silver clusters obtained by bombardment of electron pulses in water-in-oil microemulsions showed absorption maximum at 405 nm. The transmission electron micrograph studies showed the presence of silver nanoparticles having an average size of 10 nm. (C) 2004 Elsevier B.V. All rights reserved.