validation study of the computational protocol for predicting the optical properties of Monolayer-Protected metal Clusters (MPCs) using time-dependent density-functional theory is presented. The Au25(SC2H4Ph)18− MPC is chosen as a reference, due to the availability of both structural and optical experimental data. The effects of the geometry, the basis set, the exchange-correlation functionals, and the use of simplified or experimental ligands on the optical properties of Au25(SC2H4Ph)18− are discussed critically. When such options are carefully selected, an almost quantitative matching between theory and experiment is obtained. Noteworthy, the use of a precise geometric structure proves to be both crucial and critical for an accurate prediction of the optical response of MPC systems, a feature which is not easy to achieve using current density-functional theory approaches.

Time-dependent density-functional study of the photoabsorption spectrum of Au25(SC2H4C6H5)18 anion: Validation of the computational protocol

Baseggio, Oscar;Fronzoni, Giovanna;Toffoli, Daniele;Stener, Mauro;
2018-01-01

Abstract

validation study of the computational protocol for predicting the optical properties of Monolayer-Protected metal Clusters (MPCs) using time-dependent density-functional theory is presented. The Au25(SC2H4Ph)18− MPC is chosen as a reference, due to the availability of both structural and optical experimental data. The effects of the geometry, the basis set, the exchange-correlation functionals, and the use of simplified or experimental ligands on the optical properties of Au25(SC2H4Ph)18− are discussed critically. When such options are carefully selected, an almost quantitative matching between theory and experiment is obtained. Noteworthy, the use of a precise geometric structure proves to be both crucial and critical for an accurate prediction of the optical response of MPC systems, a feature which is not easy to achieve using current density-functional theory approaches.
2018
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https://onlinelibrary.wiley.com/doi/full/10.1002/qua.25769
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2931076
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