Magic Numbers in DNA-Stabilized Fluorescent Silver Clusters Lead to Magic Colors.
Magic Numbers in DNA-Stabilized Fluorescent Silver Clusters Lead to Magic Colors.
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DNA稳定的荧光银簇中的魔术数字导致魔术色。
DOI:
10.1021/jz500146q
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发表时间:
2014-03-20
期刊:
影响因子:
--
通讯作者:
Gwinn E
中科院分区:
文献类型:
--
作者:
Copp SM;Schultz D;Swasey S;Pavlovich J;Debord M;Chiu A;Olsson K;Gwinn E
DNA-stabilized silver clusters are remarkable for the selection of fluorescence color by the sequence of the stabilizing DNA oligomer. Yet despite a growing number of applications that exploit this property, no large-scale studies have probed origins of cluster color or whether certain colors occur more frequently than others. Here we employ a set of 684 randomly chosen 10-base oligomers to address these questions. Rather than a flat distribution, we find that specific color bands dominate. Cluster size data indicate that these “magic colors” originate from the existence of magic numbers for DNA-stabilized silver clusters, which differ from those of spheroidal gold clusters stabilized by small-molecule ligands. Elongated cluster structures, enforced by multiple base ligands along the DNA, can account for both magic number sizes and color variation around peak wavelength populations.
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