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首页> 外文期刊>Chemistry: A European journal >A Highly Charged Ag6 4+ Core in a DNA-Encapsulated Silver Nanocluster
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A Highly Charged Ag6 4+ Core in a DNA-Encapsulated Silver Nanocluster

机译：DNA封装的银纳米簇中的带高电荷的Ag6 4+核

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Small metal clusters fill the gap between the atomic scale and the metallic state with its distinctive bulk phenomena.[1] Besides being of high fundamental interest, this intermediate character of metal clusters also gives rise to unique and potentially useful electronic, magnetic, and optical properties.[2] To bring these properties to real-world applications, however, the clusters must be stabilized and prevented from spontaneous aggregation and other decomposition reactions. One successful strategy relies on the immobilization of metal clusters on surfaces.[3] Another approach stabilizes the clusters by the attachment of protective ligands.[4] Quite often the same ligands can also serve as templates for the formation of the metal clusters.[4] This favorable situation is realized for a manifold of silver nanoclusters, which are synthesized by the reduction of silver salts in the presence of templates, such as poly(amidoamine) dendrimers,[5] poly- (acrylic acid) derivatives,[6] poly(methacrylic acid),[7] peptides,[8] or DNA.[9] The thus formed nanoclusters contain only a few Ag atoms and hence exhibit molecule-like properties,[10] in contrast to the conventional larger nanoparticles, which more closely resemble the metallic state.[11] In particular, the strong fluorescence of silver nanoclusters has attracted significant attention because of its potential practical applications.[ 5–10] Among the various species investigated so far, silver nanoclusters encapsulated by the single-stranded oligonucleotide dC12 arguably constitute the most promising system thanks to their very high photoemission rates and their excellent photostability.[12]
机译：小金属簇以其独特的体积现象填充了原子尺度和金属态之间的空隙。[1]除了具有很高的基本价值外，金属簇的这种中间特性还产生了独特的并且可能有用的电子，磁性和光学性质。[2]为了将这些特性带入实际应用，必须稳定簇并防止其自发聚集和发生其他分解反应。一种成功的策略是将金属簇固定在表面上。[3]另一种方法是通过连接保护性配体来稳定簇。[4]通常，相同的配体也可以用作金属簇形成的模板。[4]对于银纳米簇的流形来说，这种有利情况是实现的，这些银纳米簇是通过在模板的存在下还原银盐而合成的，所述模板例如聚（酰胺基胺）树枝状大分子，[5]聚（丙烯酸）衍生物，[6]聚（甲基丙烯酸），[7]肽，[8]或DNA。[9]这样形成的纳米团簇仅包含几个Ag原子，因此表现出类似于分子的性质[10]，而传统的较大的纳米粒子则更类似于金属态。[11]尤其是，由于其潜在的实际应用，银纳米团簇的强荧光性引起了广泛关注。[5-10]在迄今为止研究的各种物种中，单链寡核苷酸dC12封装的银纳米团簇可以说是最有希望的系统具有很高的光发射率和出色的光稳定性。[12]

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