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J Am Chem Soc. 2011 Aug 10;133(31):11837-9. doi: 10.1021/ja202797w. Epub 2011 Jul 19.

Ag K-edge EXAFS analysis of DNA-templated fluorescent silver nanoclusters: insight into the structural origins of emission tuning by DNA sequence variations.

Author information

1
Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. neidig@chem.rochester.edu

Abstract

DNA-templated silver nanoclusters are promising biological fluorescence probes due to their useful fluorescence properties, including tunability of emission wavelength through DNA template sequence variations. Ag K-edge EXAFS analysis of DNA-templated silver nanoclusters has been used to obtain insight into silver nanocluster bonding, size, and structural correlations to fluorescence. The results indicate the presence of small silver nanoclusters (<30 silver atoms) containing Ag-Ag bonds and Ag-N/O ligations to DNA. The DNA sequence used leads to differences in silver-DNA ligation as well as silver nanocluster size. The results support a model in which cooperative effects of both Ag-DNA ligation and variations in cluster size lead to the tuning of the fluorescence emission of DNA-templated silver nanoclusters.

PMID:
21770404
DOI:
10.1021/ja202797w
[Indexed for MEDLINE]

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