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Trzmiel SPO, Langmann J, Maichle-Mössmer C, Anwander R. Chromous siloxides of variable nuclearity and magnetism. Dalton Trans 2022; 51:5072-5081. [PMID: 35262151 DOI: 10.1039/d2dt00354f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of Cr[N(SiMe3)2]2(thf)2 with HOSiR3 (R = Et, iPr) in THF afforded the bridged CrII siloxide complexes Cr3(OSiEt3)2(μ-OSiEt3)4(thf)2 and Cr2(OSiiPr3)2(μ-OSiiPr3)2(thf)2 in high yield. Exposure of these compounds to vacuum in aliphatic solvents led to the loss of coordinated THF and to the formation of the homoleptic chromous siloxides Cr4(μ-OSiEt3)8 and Cr3(OSiiPr3)2(μ-OSiiPr3)4, respectively, in moderate to high yield. Use of TMEDA as a potentially bidentate donor molecule gave the monomeric cis-coordinated siloxide Cr(OSiiPr3)2(tmeda) (tmeda = N,N,N',N'-tetramethylethane-1,2-diamine). Oxidation of Cr2(OSiiPr3)2(μ-OSiiPr3)2(thf)2 with CHI3 and C2Cl6 produced the trigonal bipyramidal chromic compound CrIII(OSiiPr)3(thf)2 and asymmetrically coordinated Cr2Cl3(OSiiPr3)3(thf)3, respectively. Magnetic measurements (Evans and SQUID) hinted at (a) antiferromagnetic interactions between the CrII centres, (b) revealed higher effective magnetic moments (μeff) for cis-coordinated monomeric heteroleptic complexes compared to trans-coordinated ones, and (c) pointed out the highest (μeff) for the tetranuclear complex Cr4(μ-OSiEt3)8 (6.26μB, SQUID, 300 K; Cr⋯Cradjacent avg. 2.535 A).
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Affiliation(s)
- Simon P O Trzmiel
- Institute of Inorganic Chemistry, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
| | - Jan Langmann
- Institut für Physik, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany
| | - Cäcilia Maichle-Mössmer
- Institute of Inorganic Chemistry, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
| | - Reiner Anwander
- Institute of Inorganic Chemistry, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
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2
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Bucinsky L, Breza M, Malček M, Powers DC, Hwang SJ, Krzystek J, Nocera DG, Telser J. High-Frequency and -Field EPR (HFEPR) Investigation of a Pseudotetrahedral CrIV Siloxide Complex and Computational Studies of Related CrIVL4 Systems. Inorg Chem 2019; 58:4907-4920. [DOI: 10.1021/acs.inorgchem.8b03512] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Michal Malček
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovakia
| | - David C. Powers
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Seung Jun Hwang
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
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3
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Fataftah MS, Freedman DE. Progress towards creating optically addressable molecular qubits. Chem Commun (Camb) 2018; 54:13773-13781. [PMID: 30468437 DOI: 10.1039/c8cc07939k] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The emerging field of quantum information science promises to transform a diverse range of scientific fields, ranging from computation to sensing and metrology. The interdisciplinary scientific community laid the groundwork for the next generation of quantum technologies through key advances in understanding the fundamental unit of quantum information science, the qubit. Electronic spin is a promising platform for qubits, demonstrating suitably long coherence times, optical initialization, and single spin addressability. Herein, we discuss recent accomplishments and future progress from our group targeted at imbuing transition metal complexes with the aforementioned properties, creating a pathway to fusing spatial precision with long coherence times. A strong emphasis of this feature article is progressing towards single spin measurements via a chemical approach for imbuing molecular qubits with an optically-induced spin polarization mechanism.
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Affiliation(s)
- Majed S Fataftah
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
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4
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Halbach RL, Gygi D, Bloch ED, Anderson BL, Nocera DG. Structurally characterized terminal manganese(iv) oxo tris(alkoxide) complex. Chem Sci 2018; 9:4524-4528. [PMID: 29896395 PMCID: PMC5958342 DOI: 10.1039/c8sc01164h] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 04/16/2018] [Indexed: 12/22/2022] Open
Abstract
First structurally characterized Mn(iv) oxo.
A Mn(iv) complex featuring a terminal oxo ligand, [MnIV(O)(ditox)3][K(15-C-5)2] (3; ditox = tBu2MeCO–, 15-C-5 = 15-crown-5-ether) has been isolated and structurally characterized. Treatment of the colorless precursor [MnII(ditox)3][K(15-C-5)2] (2) with iodosobenzene affords 3 as a green free-flowing powder in high yields. The X-ray crystal structure of 3 reveals a pseudotetrahedral geometry about the central Mn, which features a terminal oxo (d(Mn–Oterm = 1.628(2) Å)). EPR spectroscopy, SQUID magnetometry, and Evans method magnetic susceptibility indicate that 3 consists of a high-spin S = 3/2 Mn(iv) metal center. 3 promotes C–H bond activation by a hydrogen atom abstraction. The [MnIV(O)(ditox)3]– furnishes a model for the proposed terminal oxo of the unique manganese of the oxygen evolving complex of photosystem II.
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Affiliation(s)
- Robert L Halbach
- Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , USA .
| | - David Gygi
- Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , USA .
| | - Eric D Bloch
- Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , USA .
| | - Bryce L Anderson
- Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , USA .
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , USA .
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Hao J, Vabre B, Zargarian D. Reactions of Phenylhydrosilanes with Pincer–Nickel Complexes: Evidence for New Si–O and Si–C Bond Formation Pathways. J Am Chem Soc 2015; 137:15287-98. [PMID: 26562478 DOI: 10.1021/jacs.5b10066] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jingjun Hao
- Département
de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
| | - Boris Vabre
- Département
de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
| | - Davit Zargarian
- Département
de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
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Guillemot G, Matricardi E, Chamoreau LM, Thouvenot R, Proust A. Oxidovanadium(V) Anchored to Silanol-Functionalized Polyoxotungstates: Molecular Models for Single-Site Silica-Supported Vanadium Catalysts. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01878] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Geoffroy Guillemot
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75252 Paris Cedex 05, France
| | - Edoardo Matricardi
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75252 Paris Cedex 05, France
| | - Lise-Marie Chamoreau
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75252 Paris Cedex 05, France
| | - René Thouvenot
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75252 Paris Cedex 05, France
| | - Anna Proust
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, F-75252 Paris Cedex 05, France
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Przyojski JA, Kiewit ML, Fillman KL, Arman HD, Tonzetich ZJ. Homoleptic transition metal complexes of the 7-azaindolide ligand featuring κ(1)-N1 coordination. Inorg Chem 2015; 54:9637-9645. [PMID: 26378471 DOI: 10.1021/acs.inorgchem.5b01732] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Homoleptic complexes of the anion of 7-azaindole (AzaIn) were synthesized and characterized for a series of 3d transition metals. For Mn(II), Fe(II), and Co(II), complexes of formula Na2[M(AzaIn)4]·2L (L = tetrahydrofuran (THF), 2-MeTHF, toluene, or benzene) were isolated by treatment of the corresponding metal chloride salts with 7-azaindole in the presence of sodium hexamethyldisilazide. The complexes adopt tetrahedral geometries with exclusive coordination to the transition metal ion through the pyrrolic N1 nitrogen atoms of the AzaIn ligands. Solid-state structures of the complexes demonstrate that the sodium cations remain tightly associated with the coordination entities through interaction with both the pyrrolic and pyridine nitrogen atoms of the azaindolide ligands. For Fe(II), replacement of the sodium cations by other alkali metal ions (Li or K) generates new complexes that demonstrate similar coordination geometries to the sodium salts. As a means of comparison, the Fe(II) complex of 4-azaindolide was also investigated. Na2[Fe(4-AzaIn)4]·2L adopts a similar solution structure to the 7-azaindolide complexes as judged by NMR spectroscopy and cyclic voltammetry. Density functional theory calculations were performed to investigate the bonding in the 7-azaindolide complexes. Results demonstrate that 7-azaindolide-κ(1)-N1 is a nearly pure sigma donor ligand that features a high degree of ionic character in its bonding to mid 3d transition metal ions.
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Affiliation(s)
- Jacob A Przyojski
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249
| | - Monica L Kiewit
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249
| | - Kathlyn L Fillman
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249.,Department of Chemistry, University of Rochester, Rochester, NY 14627
| | - Hadi D Arman
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249
| | - Zachary J Tonzetich
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, TX 78249
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8
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Ali A, Langer M, Lorenz V, Hrib CG, Hilfert L, Edelmann FT. Synthesis and structure of hexaphenyltrisiloxanediolates of sodium, titanium, and iron. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Schax F, Suhr S, Bill E, Braun B, Herwig C, Limberg C. A Heterobimetallic Superoxide Complex formed through O2Activation between Chromium(II) and a Lithium Cation. Angew Chem Int Ed Engl 2014; 54:1352-6. [DOI: 10.1002/anie.201409294] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Indexed: 11/11/2022]
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Schax F, Suhr S, Bill E, Braun B, Herwig C, Limberg C. Bildung eines heterobimetallischen Superoxidkomplexes durch Sauerstoffaktivierung zwischen Chrom(II) und einem Lithiumkation. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hao J, Vabre B, Zargarian D. POCOP-Ligated Nickel Siloxide Complexes: Syntheses, Characterization, and Reactivities. Organometallics 2014. [DOI: 10.1021/om500916d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jingjun Hao
- Département de Chimie, Université de Montréal, Montréal, Québec, Canada H3C 3J7
| | - Boris Vabre
- Département de Chimie, Université de Montréal, Montréal, Québec, Canada H3C 3J7
| | - Davit Zargarian
- Département de Chimie, Université de Montréal, Montréal, Québec, Canada H3C 3J7
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12
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Rausch J, Lorenz V, Hrib CG, Frettlöh V, Adlung M, Wickleder C, Hilfert L, Jones PG, Edelmann FT. Heterometallic europium disiloxanediolates: synthesis, structural diversity, and photoluminescence properties. Inorg Chem 2014; 53:11662-74. [PMID: 25330143 DOI: 10.1021/ic501837x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This contribution presents a full account of a structurally diverse class of heterometallic europium disiloxanediolates. The synthetic protocol involves in situ metalation of (HO)SiPh2OSiPh2(OH) (1) with either (n)BuLi or KN(SiMe3)2 followed by treatment with EuCl3 in suitable solvents such as 1,2-dimethoxyethane (DME) or tetrahydrofuran (THF). Reaction of EuCl3 with 2 equiv of (LiO)SiPh2OSiPh2(OLi) in DME afforded the Eu(III) bis(disiloxanediolate) "ate" complex [{(Ph2SiO)2O}2{Li(DME)}3]EuCl2 (2), which upon attempted reduction with Zn gave the tris(disiloxanediolate) [{(Ph2SiO)2O}3{Li(DME)}3]Eu (3). Treatment of EuCl3 with (LiO)SiPh2OSiPh2(OLi) in a molar ratio of 1:2 yielded both the ate complex [{(Ph2SiO)2O}3Li{Li(THF)2}{Li(THF)}]EuCl·Li(THF)3 (4) and the LiCl-free europium(III) complex [{(Ph2SiO)2O}2{Li(THF)2}2]EuCl (5). Compound 5 was found to exhibit a brilliant red triboluminescence. When (KO)SiPh2OSiPh2(OK) was used as starting material in a 3:1 reaction with EuCl3, the Eu(III) tris(disiloxanediolate) [{(Ph2SiO)2O}3{K(DME)}3]Eu (6) was isolated. Attempted ligand transfer between 5 and (DAD(Dipp))2Ba(DME) (DAD(Dipp) = N,N'-bis(2,6-diisopropylphenyl)-1,4-diaza-1,3-butadiene) afforded the unique mixed-valent Eu(III)/Eu(II) disiloxanediolate cluster [(Ph2SiO)2O]6Eu(II)4Eu(III)2Li4O2Cl2 (7). All new complexes were structurally characterized by X-ray diffraction. Photoluminescence studies were carried out for complex 5 showing an excellent color quality, due to the strong (5)D0→(7)F2 transition, but a weak antenna effect.
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Affiliation(s)
- Janek Rausch
- Chemisches Institut der Otto-von-Guericke-Universität Magdeburg , Universitätsplatz 2, 39106 Magdeburg, Germany
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Hao J, Mougang-Soumé B, Vabre B, Zargarian D. On the Stability of a POCsp3OP-Type Pincer Ligand in Nickel(II) Complexes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Hao J, Mougang-Soumé B, Vabre B, Zargarian D. On the Stability of a POCsp3OP-Type Pincer Ligand in Nickel(II) Complexes. Angew Chem Int Ed Engl 2014; 53:3218-22. [DOI: 10.1002/anie.201310386] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Indexed: 11/10/2022]
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Reisinger S, Bodensteiner M, Pineda EM, McDouall JJW, Scheer M, Layfield RA. Addition of pnictogen atoms to chromium(ii): synthesis, structure and magnetic properties of a chromium(iv) phosphide and a chromium(iii) arsenide. Chem Sci 2014. [DOI: 10.1039/c4sc00666f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Chromium(ii) chloride reacts with LiCp* (Cp* = C5Me5) and LiE (SiMe3)2 (E = P or As) to give the chromium(iv) phosphide [(η5-Cp*Cr)(μ3-P)]4 (1) or the chromium(iii) arsenide [(η5-Cp*Cr)3(μ3-As)2] (2), respectively.
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Affiliation(s)
- Sabine Reisinger
- Institute für Anorganische Chemie
- Universität Regensburg
- 93040 Regensburg, Germany
| | - Michael Bodensteiner
- Institute für Anorganische Chemie
- Universität Regensburg
- 93040 Regensburg, Germany
| | - Eufemio Moreno Pineda
- School of Chemistry
- The University of Manchester
- Manchester, UK
- Photon Science Institute
- The University of Manchester
| | | | - Manfred Scheer
- Institute für Anorganische Chemie
- Universität Regensburg
- 93040 Regensburg, Germany
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Mansell SM, Farnaby JH, Germeroth AI, Arnold PL. Thermally Stable Uranium Dinitrogen Complex with Siloxide Supporting Ligands. Organometallics 2013. [DOI: 10.1021/om4003957] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Stephen M. Mansell
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s
Buildings, Edinburgh, EH9 3JJ, U.K
| | - Joy H. Farnaby
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s
Buildings, Edinburgh, EH9 3JJ, U.K
| | - Anne I. Germeroth
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s
Buildings, Edinburgh, EH9 3JJ, U.K
| | - Polly L. Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s
Buildings, Edinburgh, EH9 3JJ, U.K
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