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Ligand-Enhanced Optical Response of Gold Nanomolecules and Its Fragment Projection Analysis: The Case of Au 30 (SR) 18

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [2];  [2];  [3];  [4];  [2];  [1]
  1. Consiglio Nazionale delle Ricerche (CNR), Pisa (Italy)
  2. Univ. of Trieste (Italy). Dept. of Chemical Science and Pharmacy
  3. Univ. of Mississippi, Oxford, MS (United States). Dept. of Chemistry and Biochemistry
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
We investigate via first-principles simulations the optical absorption spectra of three different Au30(SR)18 monolayer-protected clusters (MPC): Au30(StBu)18, Au30(SPh)18, and Au30(SPh-pNO2)18. Au30(StBu)18 is known in the literature, and its crystal structure is available. In contrast, Au30(SPh)18 and Au30(SPh-pNO2)18 are two species that have been designed by replacing the tert-butyl organic residues of Au30(StBu)18 with aromatic ones so as to investigate the effects of ligand replacement on the optical response of Au nanomolecules. By analogy to a previously studied Au23(SR)16– anionic species, despite distinct differences in charge and chemical composition, a substantial ligand enhancement of the absorption intensity in the optical region is also obtained for the Au30(SPh-pNO2)18 MPC. Furthermore, the use of conjugated aromatic ligands with properly chosen electron-withdrawing substituents and exhibiting steric hindrance so as to also achieve charge decompression at the surface is therefore demonstrated as a general approach to enhancing the MPC photoabsorption intensity in the optical region. In addition, we here subject the ligand-enhancement phenomenon to a detailed analysis based on the fragment projection of electronic excited states and on induced transition densities, leading to a better understanding of the physical origin of this phenomenon, thus opening avenues to its more precise control and exploitation.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1343948
Alternate ID(s):
OSTI ID: 1364002
Report Number(s):
PNNL-SA--123164
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 2 Vol. 8; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Time-dependent density-functional study of the photoabsorption spectrum of Au 25 (SC 2 H 4 C 6 H 5 ) 18 anion: Validation of the computational protocol journal July 2018
Effects of oxidation on the plasmonic properties of aluminum nanoclusters journal January 2017
Modulating photo-luminescence of Au 2 Cu 6 nanoclusters via ligand-engineering journal January 2017
Understanding energy transfer with luminescent gold nanoclusters: a promising new transduction modality for biorelated applications journal January 2017
Au 36 (SePh) 24 nanomolecules: synthesis, optical spectroscopy and theoretical analysis journal January 2018
Pd doping, conformational, and charge effects on the dichroic response of a monolayer protected Au 38 (SR) 24 nanocluster journal January 2019
Chirality in bare and ligand-protected metal nanoclusters journal January 2018

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