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Berthold C, Müller M, Ivlev SI, Andrada DM, Buchner MR. Gauging ambiphilicity of pseudo-halides via beryllium-trispyrazolylborato compounds. Dalton Trans 2023; 52:13547-13554. [PMID: 37721484 DOI: 10.1039/d3dt02857g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
The ambiphilicity of pseudo-halides has been the object of extensive debate. Herein, we use a series of trispyrazolylborato beryllium pseudo-halido complexes [TpBe(X')] with X' = CN-, N3-, NCO- and NCS- to explore the origins of the preferred isomers. Thus, we have synthesised and characterised through NMR and IR spectroscopy as well as single crystal X-ray diffraction these complexes. A combination with quantum chemical calculations within the DFT framework enabled an in-depth understanding of the bonding modes and preferences of the investigated pseudo-halido ligands.
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Affiliation(s)
- Chantsalmaa Berthold
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
| | - Matthias Müller
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
| | - Sergei I Ivlev
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
| | - Diego M Andrada
- General and Inorganic Chemistry Department, University of Saarland, Campus C4.1, 66123 Saarbruecken, Germany.
| | - Magnus R Buchner
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
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Reiners M, Maekawa M, Daniliuc CG, Freytag M, Jones PG, White PS, Hohenberger J, Sutter J, Meyer K, Maron L, Walter MD. Reactivity studies on [Cp'Fe(μ-I)] 2: nitrido-, sulfido- and diselenide iron complexes derived from pseudohalide activation. Chem Sci 2017; 8:4108-4122. [PMID: 30155215 PMCID: PMC6099922 DOI: 10.1039/c7sc00570a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 03/29/2017] [Indexed: 11/21/2022] Open
Abstract
Facile pseudohalide activation occurs in the reaction of SCN–, SeCN– and N3– with the iron half-sandwich [Cp′Fe(μ-I)]2.
The iron half-sandwich [Cp′Fe(μ-I)]2 (Cp′ = 1,2,4-(Me3C)3C5H2, 1) reacts with the pseudohalides NCO–, SCN–, SeCN– and N3– to give [Cp′Fe(μ-NCO)]2 (2), [Cp′Fe(μ-S)]2 (3), [Cp′Fe(μ-Se2)]2 (4) and [Cp′Fe(μ-N)]2 (5), respectively. Various spectroscopic techniques including X-ray diffraction, solid-state magnetic susceptibility studies and 57Fe Mössbauer spectroscopy were employed in the characterization of these species. Mössbauer spectroscopy shows a decreasing isomer shift with increasing formal oxidation state, ranging from Fe(ii) to Fe(iv), in complexes 1 to 5. The sulfido-bridged dimer 3 exhibits strong antiferromagnetic coupling between the Fe(iii) centers. This leads to temperature-independent paramagnetism (TIP) at low temperature, from which the energy gap between the ground and the excited state can be estimated to be 2J = ca. 700 cm–1. The iron(iv) nitrido complex [Cp′Fe(μ-N)]2 (5) shows no reactivity towards H2 (10 atm), but undergoes clean reactions with CO (5 bar) and XylNC (Xyl = 2,6-Me2C6H3) to form the diamagnetic isocyanate and carbodiimide complexes [Cp′Fe(CO)2(NCO)] (7) and [Cp′Fe(CNXyl)2(NCNXyl)] (8), respectively. All compounds were fully characterized, and density functional theory (DFT) computations provide useful insights into their formation and the electronic structures of complexes 3 and 5.
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Affiliation(s)
- Matthias Reiners
- Technische Universität Braunschweig , Institut für Anorganische und Analytische Chemie , Hagenring 30 , 38106 Braunschweig , Germany .
| | - Miyuki Maekawa
- Technische Universität Braunschweig , Institut für Anorganische und Analytische Chemie , Hagenring 30 , 38106 Braunschweig , Germany .
| | - Constantin G Daniliuc
- Technische Universität Braunschweig , Institut für Anorganische und Analytische Chemie , Hagenring 30 , 38106 Braunschweig , Germany .
| | - Matthias Freytag
- Technische Universität Braunschweig , Institut für Anorganische und Analytische Chemie , Hagenring 30 , 38106 Braunschweig , Germany .
| | - Peter G Jones
- Technische Universität Braunschweig , Institut für Anorganische und Analytische Chemie , Hagenring 30 , 38106 Braunschweig , Germany .
| | - Peter S White
- University of North Carolina at Chapel Hill , Department of Chemistry , Chapel Hill , North Carolina 27599-3290 , USA
| | - Johannes Hohenberger
- University of Erlangen-Nürnberg , Department of Chemistry & Pharmacy , Inorganic Chemistry , Egerlandstr. 1 , 91058 Erlangen , Germany
| | - Jörg Sutter
- University of Erlangen-Nürnberg , Department of Chemistry & Pharmacy , Inorganic Chemistry , Egerlandstr. 1 , 91058 Erlangen , Germany
| | - Karsten Meyer
- University of Erlangen-Nürnberg , Department of Chemistry & Pharmacy , Inorganic Chemistry , Egerlandstr. 1 , 91058 Erlangen , Germany
| | - Laurent Maron
- Université de Toulouse , INSA-UPS-LPCNO , CNRS-LPCNO , 135 Avenue de Rangueil , F-31077 Toulouse , France .
| | - Marc D Walter
- Technische Universität Braunschweig , Institut für Anorganische und Analytische Chemie , Hagenring 30 , 38106 Braunschweig , Germany .
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