A Fast Transient Absorption Study of Co(AcAc)3
The study of transition metal coordination complexes has played a key role in establishing quantum chemistry concepts such as that of ligand field theory. Furthermore, the study of the dynamics of their excited states is of primary importance in determining the de-excitation path of electrons to tai...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-05-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fchem.2019.00348/full |
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| author | Luisa Ferrari Mauro Satta Amedeo Palma Lorenzo Di Mario Daniele Catone Patrick O'Keeffe Nicola Zema Tommaso Prosperi Stefano Turchini |
| author_facet | Luisa Ferrari Mauro Satta Amedeo Palma Lorenzo Di Mario Daniele Catone Patrick O'Keeffe Nicola Zema Tommaso Prosperi Stefano Turchini |
| author_sort | Luisa Ferrari |
| collection | DOAJ |
| description | The study of transition metal coordination complexes has played a key role in establishing quantum chemistry concepts such as that of ligand field theory. Furthermore, the study of the dynamics of their excited states is of primary importance in determining the de-excitation path of electrons to tailor the electronic properties required for important technological applications. This work focuses on femtosecond transient absorption spectroscopy of Cobalt tris(acetylacetonate) (Co(AcAc)3) in solution. The fast transient absorption spectroscopy has been employed to study the excited state dynamics after optical excitation. Density functional theory coupled with the polarizable continuum model has been used to characterize the geometries and the electronic states of the solvated ion. The excited states have been calculated using the time dependent density functional theory formalism. The time resolved dynamics of the ligand to metal charge transfer excitation revealed a biphasic behavior with an ultrafast rise time of 0.07 ± 0.04 ps and a decay time of 1.5 ± 0.3 ps, while the ligand field excitations dynamics is characterized by a rise time of 0.07 ± 0.04 ps and a decay time of 1.8 ± 0.3 ps. Time dependent density functional theory calculations of the spin-orbit coupling suggest that the ultrafast rise time can be related to the intersystem crossing from the originally photoexcited state. The picosecond decay is faster than that of similar cobalt coordination complexes and is mainly assigned to internal conversion within the triplet state manifold. The lack of detectable long living states (>5 ps) suggests that non-radiative decay plays an important role in the dynamics of these molecules. |
| first_indexed | 2024-12-15T00:04:35Z |
| format | Article |
| id | doaj.art-0b1b1b4910c64a9a8739a6dce2b9aeb1 |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-12-15T00:04:35Z |
| publishDate | 2019-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-0b1b1b4910c64a9a8739a6dce2b9aeb12022-12-21T22:42:46ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462019-05-01710.3389/fchem.2019.00348453229A Fast Transient Absorption Study of Co(AcAc)3Luisa Ferrari0Mauro Satta1Amedeo Palma2Lorenzo Di Mario3Daniele Catone4Patrick O'Keeffe5Nicola Zema6Tommaso Prosperi7Stefano Turchini8CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Rome, ItalyCNR-ISMN, Chemistry Department, Università di Roma Sapienza, Rome, ItalyCNR-ISMN, Area della Ricerca di Roma 1 - Montelibretti, Rome, ItalyCNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Rome, ItalyCNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Rome, ItalyCNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma 1 - Montelibretti, Rome, ItalyCNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Rome, ItalyCNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Rome, ItalyCNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Rome, ItalyThe study of transition metal coordination complexes has played a key role in establishing quantum chemistry concepts such as that of ligand field theory. Furthermore, the study of the dynamics of their excited states is of primary importance in determining the de-excitation path of electrons to tailor the electronic properties required for important technological applications. This work focuses on femtosecond transient absorption spectroscopy of Cobalt tris(acetylacetonate) (Co(AcAc)3) in solution. The fast transient absorption spectroscopy has been employed to study the excited state dynamics after optical excitation. Density functional theory coupled with the polarizable continuum model has been used to characterize the geometries and the electronic states of the solvated ion. The excited states have been calculated using the time dependent density functional theory formalism. The time resolved dynamics of the ligand to metal charge transfer excitation revealed a biphasic behavior with an ultrafast rise time of 0.07 ± 0.04 ps and a decay time of 1.5 ± 0.3 ps, while the ligand field excitations dynamics is characterized by a rise time of 0.07 ± 0.04 ps and a decay time of 1.8 ± 0.3 ps. Time dependent density functional theory calculations of the spin-orbit coupling suggest that the ultrafast rise time can be related to the intersystem crossing from the originally photoexcited state. The picosecond decay is faster than that of similar cobalt coordination complexes and is mainly assigned to internal conversion within the triplet state manifold. The lack of detectable long living states (>5 ps) suggests that non-radiative decay plays an important role in the dynamics of these molecules.https://www.frontiersin.org/article/10.3389/fchem.2019.00348/fullfast transient absorptionTDDFT (time-dependent density functional theory) calculationsfemtosecand laser pulsesmetal complexescharge - transfer |
| spellingShingle | Luisa Ferrari Mauro Satta Amedeo Palma Lorenzo Di Mario Daniele Catone Patrick O'Keeffe Nicola Zema Tommaso Prosperi Stefano Turchini A Fast Transient Absorption Study of Co(AcAc)3 Frontiers in Chemistry fast transient absorption TDDFT (time-dependent density functional theory) calculations femtosecand laser pulses metal complexes charge - transfer |
| title | A Fast Transient Absorption Study of Co(AcAc)3 |
| title_full | A Fast Transient Absorption Study of Co(AcAc)3 |
| title_fullStr | A Fast Transient Absorption Study of Co(AcAc)3 |
| title_full_unstemmed | A Fast Transient Absorption Study of Co(AcAc)3 |
| title_short | A Fast Transient Absorption Study of Co(AcAc)3 |
| title_sort | fast transient absorption study of co acac 3 |
| topic | fast transient absorption TDDFT (time-dependent density functional theory) calculations femtosecand laser pulses metal complexes charge - transfer |
| url | https://www.frontiersin.org/article/10.3389/fchem.2019.00348/full |
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