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Spin−Orbit TDDFT Electronic Structure of Diplatinum(II,II) Complexes

Záliš, Stanislav and Lam, Yan-Choi and Gray, Harry B. and Vlček, Antonín (2015) Spin−Orbit TDDFT Electronic Structure of Diplatinum(II,II) Complexes. Inorganic Chemistry, 54 (7). pp. 3491-3500. ISSN 0020-1669.

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[Pt_2(μ-P_2O_5H_2)_4]^(4–) (Pt(pop)) and its perfluoroborated derivative [Pt_2(μ-P_2O_5(BF_2)_2)_4]^(4–) (Pt(pop-BF_2)) are d^8–d^8 complexes whose electronic excited states can drive reductions and oxidations of relatively inert substrates. We performed spin–orbit (SO) TDDFT calculations on these complexes that account for their absorption spectra across the entire UV–vis spectral region. The complexes exhibit both fluorescence and phosphorescence attributable, respectively, to singlet and triplet excited states of dσ*pσ origin. These features are energetically isolated from each other (∼7000 cm^(–1) for (Pt(pop-BF_2)) as well as from higher-lying states (5800 cm^(–1)). The lowest ^3dσ*pσ state is split into three SO states by interactions with higher-lying singlet states with dπpσ and, to a lesser extent, pπpσ contributions. The spectroscopically allowed dσ*pσ SO state has ∼96% singlet character with small admixtures of higher triplets of partial dπpσ and pπpσ characters that also mix with 3dσ*pσ, resulting in a second-order ^1dσ*pσ–^3dσ*pσ SO interaction that facilitates intersystem crossing (ISC). All SO interactions involving the dσ*pσ states are weak because of large energy gaps to higher interacting states. The spectroscopically allowed dσ*pσ SO state is followed by a dense manifold of ligand-to-metal–metal charge transfer states, some with pπpσ (at lower energies) or dπpσ contributions (at higher energies). Spectroscopically active higher states are strongly spin-mixed. The electronic structure, state ordering, and relative energies are minimally perturbed when the calculation is performed at the optimized geometries of the ^1dσ*pσ and ^3dσ*pσ excited states (rather than the ground state). Results obtained for Pt(pop) are very similar, showing slightly smaller energy gaps and, possibly, an additional ^1dσ*pσ – ^3dσ*pσ second order SO interaction involving higher ^1dπpσ* states that could account in part for the much faster ISC. It also appears that ^1dσ*pσ → ^3dσ*pσ ISC requires a structural distortion that has a lower barrier for Pt(pop) than for the more rigid Pt(pop-BF_2).

Item Type:Article
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URLURL TypeDescription Information
Lam, Yan-Choi0000-0001-7809-4471
Gray, Harry B.0000-0002-7937-7876
Additional Information:© 2015 American Chemical Society. ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Received: January 9, 2015. Publication Date (Web): March 16, 2015. We thank Mr. L. Henling (Beckman Institute) for his help with determining and presenting the X-ray structure. This work was supported by the Ministry of Education of the Czech Republic Grant No. LH13015 (Program KONTAKT II), the NSF CCI Solar Fuels Program (CHE-1305124), and the Arnold and Mabel Beckman Foundation.
Group:CCI Solar Fuels
Funding AgencyGrant Number
Ministry of Education (Czech Republic)LH13015
Arnold and Mabel Beckman FoundationUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20150508-082616550
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Official Citation:Spin–Orbit TDDFT Electronic Structure of Diplatinum(II,II) Complexes Stanislav Záliš, Yan-Choi Lam, Harry B. Gray, and Antonín Vlček Inorganic Chemistry 2015 54 (7), 3491-3500 DOI: 10.1021/acs.inorgchem.5b00063
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57364
Deposited By: Ruth Sustaita
Deposited On:08 May 2015 16:28
Last Modified:09 Mar 2020 13:19

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