Unraveling the long-pursued Au(144) structure by x-ray crystallography.
Unraveling the long-pursued Au(144) structure by x-ray crystallography.
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通过 X 射线晶体学解开长期以来追求的 Au144 结构
DOI：
10.1126/sciadv.aat7259
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发表时间：
2018-10
期刊：
影响因子：
13.6
通讯作者：
Wu Z
中科院分区：
文献类型：
--
作者：
Yan N;Xia N;Liao L;Zhu M;Jin F;Jin R;Wu Z
一种神秘的、长期追求的纳米团簇-纳米晶体过渡尺寸纳米颗粒的结构被揭开。从纳米团簇到纳米晶体的转变是纳米科学的核心问题。金属纳米颗粒在过渡尺寸范围内的原子结构测定对于在原子水平上理解量子尺寸效应具有挑战性，尤其重要。基于粒子内和粒子间的弱相互作用对生长高质量的金属纳米单晶起关键作用的理论基础，我们成功地获得了Au144(SR)60的理想晶体，并用X射线结晶学(XRC)成功地解决了它的结构；这种结构在十年前就被理论预测了，并被长期实验研究，但直到现在还没有成功。在这里，XRC首次揭示了硫代化金纳米团簇中一个有趣的AU12中空二十面体。Au-Au键长与块金接近，表现出比Au144(SR)60中其他Au-Au键长更好的热延展性，这提供了原子水平的观点，因为金属通常比非金属材料表现出更好的热延展性。因此，我们的工作不仅揭示了过渡尺寸纳米颗粒的神秘的、长期实验追求的结构，而且对于高质量单晶纳米颗粒的生长以及从化学键的角度理解金属的热伸长性具有重要的意义。
A mysterious, long-pursued structure of a nanocluster-nanocrystal transition-sized nanoparticle is unraveled. The transition from nanocluster to nanocrystal is a central issue in nanoscience. The atomic structure determination of metal nanoparticles in the transition size range is challenging and particularly important in understanding the quantum size effect at the atomic level. On the basis of the rationale that the intra- and interparticle weak interactions play critical roles in growing high-quality single crystals of metal nanoparticles, we have reproducibly obtained ideal crystals of Au144(SR)60 and successfully solved its structure by x-ray crystallography (XRC); this structure was theoretically predicted a decade ago and has long been pursued experimentally but without success until now. Here, XRC reveals an interesting Au12 hollow icosahedron in thiolated gold nanoclusters for the first time. The Au–Au bond length, close to that of bulk gold, shows better thermal extensibility than the other Au–Au bond lengths in Au144(SR)60, providing an atomic-level perspective because metal generally shows better thermal extensibility than nonmetal materials. Thus, our work not only reveals the mysterious, long experimentally pursued structure of a transition-sized nanoparticle but also has important implications for the growth of high-quality, single-crystal nanoparticles, as well as for the understanding of the thermal extensibility of metals from the perspective of chemical bonding.
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影响因子：
15
作者：
Mednikov, Evgueni G.;Jewell, Matthew C.;Dahl, Lawrence F.
通讯作者：
Dahl, Lawrence F.
影响因子：
15
作者：
Fields-Zinna, Christina A.;Sardar, Rajesh;Murray, Royce W.
通讯作者：
Murray, Royce W.
影响因子：
8.6
作者：
Qian, Huifeng;Jin, Rongchao
通讯作者：
Jin, Rongchao
DOI：
10.1126/science.1251959
发表时间：
2014-08-22
期刊：
Science (New York, N.Y.)
影响因子：
--
作者：
Azubel M;Koivisto J;Malola S;Bushnell D;Hura GL;Koh AL;Tsunoyama H;Tsukuda T;Pettersson M;Häkkinen H;Kornberg RD
通讯作者：
Kornberg RD
影响因子：
16.6
作者：
Jensen KM;Juhas P;Tofanelli MA;Heinecke CL;Vaughan G;Ackerson CJ;Billinge SJ
通讯作者：
Billinge SJ