Structural, spectroscopic and theoretical studies of diosmium(iii,iii) tetracarboxylates

Raquel Gracia, Nathan J. Patmore

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The preparation of Os2(TiPB)4Cl2 (1; TiPB = 2,4,6-triisopropylbenzoate) and Os2(TiPB)2(OAc) 2Cl2 (2) by carboxylate exchange reactions with Os 2(OAc)4Cl2 is reported. The structure of 1 has been determined by single-crystal X-ray studies, and shows a paddlewheel arrangement of the ligands about the triply bonded diosmium core. Both compounds have magnetic moments at room temperature that are consistent with the presence of two unpaired electrons, and their cyclic voltammograms show a single redox process corresponding to the Os25+/6+ redox couple. The electronic absorption spectra of 1 and 2 display an absorption at ∼395 nm, corresponding to the π(Cl) → π*(Os2) LMCT transition, as well as numerous weaker absorptions at lower energy. Density functional theory (DFT) calculations on Os2(OAc)4Cl 2 at different levels of theory (B3LYP and PBE0) have been used to probe the electronic structure of diosmium tetracarboxylates. The calculations show that these compounds have a σ2π4δ 2δ*1π*1 electronic configuration, and time-dependent DFT was used to help rationalize their optical properties.

LanguageEnglish
Pages13118-13125
Number of pages8
JournalDalton Transactions
Volume42
Issue number36
DOIs
Publication statusPublished - 28 Sep 2013
Externally publishedYes

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Density functional theory
Magnetic moments
Electronic structure
Absorption spectra
Optical properties
Single crystals
Ligands
X rays
Electrons
Temperature
Oxidation-Reduction

Cite this

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title = "Structural, spectroscopic and theoretical studies of diosmium(iii,iii) tetracarboxylates",
abstract = "The preparation of Os2(TiPB)4Cl2 (1; TiPB = 2,4,6-triisopropylbenzoate) and Os2(TiPB)2(OAc) 2Cl2 (2) by carboxylate exchange reactions with Os 2(OAc)4Cl2 is reported. The structure of 1 has been determined by single-crystal X-ray studies, and shows a paddlewheel arrangement of the ligands about the triply bonded diosmium core. Both compounds have magnetic moments at room temperature that are consistent with the presence of two unpaired electrons, and their cyclic voltammograms show a single redox process corresponding to the Os25+/6+ redox couple. The electronic absorption spectra of 1 and 2 display an absorption at ∼395 nm, corresponding to the π(Cl) → π*(Os2) LMCT transition, as well as numerous weaker absorptions at lower energy. Density functional theory (DFT) calculations on Os2(OAc)4Cl 2 at different levels of theory (B3LYP and PBE0) have been used to probe the electronic structure of diosmium tetracarboxylates. The calculations show that these compounds have a σ2π4δ 2δ*1π*1 electronic configuration, and time-dependent DFT was used to help rationalize their optical properties.",
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Structural, spectroscopic and theoretical studies of diosmium(iii,iii) tetracarboxylates. / Gracia, Raquel; Patmore, Nathan J.

In: Dalton Transactions, Vol. 42, No. 36, 28.09.2013, p. 13118-13125.

Research output: Contribution to journalArticle

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