Jahn-Teller effects in Au(25)(SR)(18).

Jahn-Teller effects in Au(25)(SR)(18).
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DOI:
10.1039/c5sc02134k
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发表时间:
2016-03-01
期刊:
影响因子:
8.4
通讯作者:
Ackerson CJ
Ackerson CJ
中科院分区:
化学1区
文献类型:
--
作者:
Tofanelli MA;Salorinne K;Ni TW;Malola S;Newell B;Phillips B;Häkkinen H;Ackerson CJ

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用单晶X射线衍射法在Au_(25)(SR)_(18)中观察到Jahn-Teller畸变。SQUID磁力测量、DFT理论和线性光谱证实了这一发现。许多分子的氧化态、结构和磁性之间的关系可以用一阶Jahn-Teller畸变很好地描述。这种关系还没有很好地定义为连接的纳米簇和纳米颗粒,特别是纳米技术相关的金硫醇盐保护的金属簇。在这里,我们询问的结构,磁性和氧化态之间的关系的三个稳定的氧化态,-1,0和+1的硫醇保护的纳米簇Au 25(SR)18。我们提出了先前未确定的电荷状态Au 25(SR)18+1的单晶X射线结构,以及中性化合物Au 25(SR)180的更高质量的单晶结构。结合SQUID磁测量和DFT理论的结构数据,能够完整地描述Au 25(SR)18在三种氧化态下的光学和磁性。总的来说,数据表明在这种化合物中存在一阶Jahn-Teller畸变。高品质的单晶X-射线结构,使配体和配体簇包装的相互作用,在硫醇保护的金属簇单晶形成的基础分析。
Jahn–Teller distortions are observed in Au25(SR)18 by single crystal X-ray crystallography. SQUID magnetometry, DFT theory, and linear optical spectroscopy corroborate the finding. The relationship between oxidation state, structure, and magnetism in many molecules is well described by first-order Jahn–Teller distortions. This relationship is not yet well defined for ligated nanoclusters and nanoparticles, especially the nano-technologically relevant gold-thiolate protected metal clusters. Here we interrogate the relationships between structure, magnetism, and oxidation state for the three stable oxidation states, –1, 0 and +1 of the thiolate protected nanocluster Au25(SR)18. We present the single crystal X-ray structures of the previously undetermined charge state Au25(SR)18+1, as well as a higher quality single crystal structure of the neutral compound Au25(SR)180. Structural data combined with SQUID magnetometry and DFT theory enable a complete description of the optical and magnetic properties of Au25(SR)18 in the three oxidation states. In aggregate the data suggests a first-order Jahn–Teller distortion in this compound. The high quality single crystal X-ray structure enables an analysis of the ligand–ligand and ligand–cluster packing interactions that underlie single-crystal formation in thiolate protected metal clusters.
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