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• W2315146644 endingPage "15322" @default.
• W2315146644 startingPage "15313" @default.
• W2315146644 abstract "DNA-templated silver nanoclusters (Ag NCs) are emerging sets of fluorophores that are widely applicable because of high brightness, good photostability, and visible to near-infrared emissions tunable using the DNA sequence and length to change the NC size. We find that fluorescent Ag NCs can be size-selectively grown at DNA abasic sites (AP site) using a constrained duplex environment opposed by a cytosine and flanked by two guanines. The size of the AP site-grown Ag NCs is not affected by the increasing Ag+ concentration. A Job’s plot analysis shows that Ag2 NCs are the species responsible for the observed emissions. Although varying the DNA sequence one base away from the AP site (i.e., the Ag NC growth site) does not alter the size of the fluorescent Ag NCs, the emissions of the formed Ag NCs are still gradually red shifted as the sequence changes from thymine (T) to cytosine (C), adenine (A), and guanine (G). Furthermore, this emission shift is strongly dependent on the base-stacking direction of the 3′-side sequence of the 5′-G stack exactly flanking the AP site, which exhibits a larger emission alteration than altering the 5′-side sequence of the 3′-G stack flanking the AP site on the other side of the site. The excited-state lifetimes of the Ag NCs are inversely proportional to the singlet energies (ΔE0,0) of the Ag NCs relative to their ground state and of the vertical ionization potentials of the guanines directly flanking the AP site as determined by the base stacking. All of these results support the conclusion that the Ag NC excited state becomes more stable by interacting with a guanine base because of the larger electronic dipole moment that can be modified by the stacked sequences. Additionally, the size of the formed Ag NCs seems to be dependent on the consecutive AP site number. Thus, the AP site design in this work provides an easy way to shed light on the role of DNA base stacking in the optical properties of Ag NCs." @default.
• W2315146644 created "2016-06-24" @default.
• W2315146644 creator A5022015104 @default.
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• W2315146644 creator A5057696166 @default.
• W2315146644 creator A5073055826 @default.
• W2315146644 creator A5088829026 @default.
• W2315146644 date "2012-08-20" @default.
• W2315146644 modified "2023-10-14" @default.
• W2315146644 title "Base-Stacking-Determined Fluorescence Emission of DNA Abasic Site-Templated Silver Nanoclusters" @default.
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• W2315146644 doi "https://doi.org/10.1021/la301957m" @default.
• W2315146644 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22881065" @default.
• W2315146644 hasPublicationYear "2012" @default.
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