Research output: Contribution to journal › Article › peer-review
Ag−DNA Emitter: Metal Nanorod or Supramolecular Complex? / Ramazanov, Ruslan R.; Sych, Tomash S.; Reveguk, Zakhar V.; Maksimov, Dmitriy A.; Vdovichev, Artem A.; Kononov, Alexei I.
In: Journal of Physical Chemistry Letters, Vol. 7, No. 18, 2016, p. 3560−3566.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Ag−DNA Emitter: Metal Nanorod or Supramolecular Complex?
AU - Ramazanov, Ruslan R.
AU - Sych, Tomash S.
AU - Reveguk, Zakhar V.
AU - Maksimov, Dmitriy A.
AU - Vdovichev, Artem A.
AU - Kononov, Alexei I.
PY - 2016
Y1 - 2016
N2 - Ligand-stabilized luminescent metal clusters, in particular, DNA-based Ag clusters, are now employed in a host of applications such as sensing and bioimaging. Despite their utility, the nature of their excited states as well as detailed structures of the luminescent metal–ligand complexes remain poorly understood. We apply a new joint experimental and theoretical approach based on QM/MM-MD simulations of the fluorescence excitation spectra for three Ag clusters synthesized on a 12-mer DNA. Contrary to a previously proposed “rod-like” model, our results show that (1) three to four Ag atoms suffice to form a partially oxidized nanocluster emitting in visible range; (2) charge transfer from Ag cluster to DNA contributes to the excited states of the complexes; and (3) excitation spectra of the clusters are strongly affected by the bonding of Ag atoms to DNA bases. The presented approach can also provide a practical way to determine the structure and properties of other luminescent metal clusters.
AB - Ligand-stabilized luminescent metal clusters, in particular, DNA-based Ag clusters, are now employed in a host of applications such as sensing and bioimaging. Despite their utility, the nature of their excited states as well as detailed structures of the luminescent metal–ligand complexes remain poorly understood. We apply a new joint experimental and theoretical approach based on QM/MM-MD simulations of the fluorescence excitation spectra for three Ag clusters synthesized on a 12-mer DNA. Contrary to a previously proposed “rod-like” model, our results show that (1) three to four Ag atoms suffice to form a partially oxidized nanocluster emitting in visible range; (2) charge transfer from Ag cluster to DNA contributes to the excited states of the complexes; and (3) excitation spectra of the clusters are strongly affected by the bonding of Ag atoms to DNA bases. The presented approach can also provide a practical way to determine the structure and properties of other luminescent metal clusters.
U2 - 10.1021/acs.jpclett.6b01672
DO - 10.1021/acs.jpclett.6b01672
M3 - Article
VL - 7
SP - 3560−3566
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 18
ER -
ID: 7581582