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
- Consiglio Nazionale delle Ricerche (CNR), Pisa (Italy)
- Univ. of Trieste (Italy). Dept. of Chemical Science and Pharmacy
- Univ. of Mississippi, Oxford, MS (United States). Dept. of Chemistry and Biochemistry
- 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
Similar Records
Ligand-Enhanced Optical Response of Gold Nanomolecules and Its Fragment Projection Analysis: The Case of Au 30 (SR) 18
Inter-staple Dithiol Crosslinking in Au25(SR)18 Nanomolecules: A Combined Mass Spectrometric and Computational Study
Interstaple Dithiol Cross-Linking in Au(25)(SR)(18) Nanomolecules: A Combined Mass Spectrometric and Computational Study
Journal Article
·
Mon Jan 09 23:00:00 EST 2017
· Journal of Physical Chemistry. C
·
OSTI ID:1364002
Inter-staple Dithiol Crosslinking in Au25(SR)18 Nanomolecules: A Combined Mass Spectrometric and Computational Study
Journal Article
·
Fri Dec 31 23:00:00 EST 2010
· Journal of the American Chemical Society
·
OSTI ID:1033535
Interstaple Dithiol Cross-Linking in Au(25)(SR)(18) Nanomolecules: A Combined Mass Spectrometric and Computational Study
Journal Article
·
Fri Dec 31 23:00:00 EST 2010
· Journal of the American Chemical Society
·
OSTI ID:1044719