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Effect of Nature of Substituents on Coordination Properties of Mono- and Disubstituted Derivatives of Boron Cluster Anions [BnHn]2– (n = 10, 12) and Carboranes with exo-Polyhedral B–X Bonds (X = N, O, S, Hal). INORGANICS 2022. [DOI: 10.3390/inorganics10120238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
This review systematizes data on the coordination ability of mono- and disubstituted derivatives of boron cluster anions and carboranes in complexation with transition metals. Boron clusters anions [BnHn]2–, monocarborane anions [CBnHn–1]–, and dicarboranes [C2BnHn–2] (with non-functionalized carbon atoms) (n = 10, 12) containing the B–X exo-polyhedral bonds (X = N, O, S, Hal) are discussed. Synthesis and structural features of complexes known to date are described. The effect of complexing metal and substituent attached to the boron cage on the composition and structures of the final complexes is analyzed. It has been established that substituted derivatives of boron cluster anions and carboranes can act as both ligands and counterions. A complexing agent can coordinate substituted derivatives of the boron cluster anions due to three-center two-electron 3c2e MHB bonds, by the substituent functional groups, or a mixed type of coordination can be realized, through the BH groups of the boron cage and the substituent. As for B-substituted carboranes, complexes with coordinated substituents or salts with non-coordinated carborane derivatives have been isolated; compounds with MHB bonding are not characteristic of carboranes.
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Avdeeva VV, Malinina EA, Zhizhin KY, Kuznetsov NT. Salts and Complexes Containing the Decachloro-closo-Decaborate Anion. RUSS J COORD CHEM+ 2021. [DOI: 10.1134/s1070328421080017] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Klare HFT, Albers L, Süsse L, Keess S, Müller T, Oestreich M. Silylium Ions: From Elusive Reactive Intermediates to Potent Catalysts. Chem Rev 2021; 121:5889-5985. [PMID: 33861564 DOI: 10.1021/acs.chemrev.0c00855] [Citation(s) in RCA: 97] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The history of silyl cations has all the makings of a drama but with a happy ending. Being considered reactive intermediates impossible to isolate in the condensed phase for decades, their actual characterization in solution and later in solid state did only fuel the discussion about their existence and initially created a lot of controversy. This perception has completely changed today, and silyl cations and their donor-stabilized congeners are now widely accepted compounds with promising use in synthetic chemistry. This review provides a comprehensive summary of the fundamental facts and principles of the chemistry of silyl cations, including reliable ways of their preparation as well as their physical and chemical properties. The striking features of silyl cations are their enormous electrophilicity and as such reactivity as super Lewis acids as well as fluorophilicity. Known applications rely on silyl cations as reactants, stoichiometric reagents, and promoters where the reaction success is based on their steady regeneration over the course of the reaction. Silyl cations can even be discrete catalysts, thereby opening the next chapter of their way into the toolbox of synthetic methodology.
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Affiliation(s)
- Hendrik F T Klare
- Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni 115, 10623 Berlin, Germany
| | - Lena Albers
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Strasse 9-11, 26129 Oldenburg, Germany
| | - Lars Süsse
- Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni 115, 10623 Berlin, Germany
| | - Sebastian Keess
- Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni 115, 10623 Berlin, Germany
| | - Thomas Müller
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Strasse 9-11, 26129 Oldenburg, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni 115, 10623 Berlin, Germany
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4
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Wu Q, Roy A, Wang G, Irran E, Klare HFT, Oestreich M. Synthese eines gegenanionstabilisierten Bis(silylium)ions. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003799] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Qian Wu
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Avijit Roy
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Guoqiang Wang
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Elisabeth Irran
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Hendrik F. T. Klare
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Martin Oestreich
- Institut für Chemie Technische Universität Berlin Straße des 17. Juni 115 10623 Berlin Deutschland
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Abstract
A series of complexation reactions of silver(I) and copper(I) in the presence of a polyhedral weakly coordinating [B10Cl10]2− anion has been carried out. The effect of the solvent and the presence of Ph3P on the composition and structure of the reaction product were studied. Eight novel complexes were obtained and characterized by 11B Nuclear magnetic resonance, Infra-Red, and Raman spectroscopies as well as powder and single-crystal X-ray diffraction techniques. The [B10Cl10]2− anion demonstrated weaker coordinating ability towards coinage metals than [B10H10]2− at similar reaction conditions. The [B10Cl10]2− anion remains unreacted in the copper(I) complexation reaction, while in the absence of competing ligands, we obtained the first complexes containing decachloro-closo-decaborate anion directly coordinated by the metal atom. The bonding between metal atoms and the boron cluster anions was studied using the atomic Hirshfeld surfaces. Besides edge and face coordination of the polyhedral anion, this method allowed us to reveal the Ag–Ag bond in crystal of {Ag2(DMF)2[B10Cl10]}n, the presence of which was additionally supported by the Raman spectroscopy data.
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Wu Q, Roy A, Wang G, Irran E, Klare HFT, Oestreich M. Synthesis of a Counteranion-Stabilized Bis(silylium) Ion. Angew Chem Int Ed Engl 2020; 59:10523-10526. [PMID: 32216163 PMCID: PMC7317492 DOI: 10.1002/anie.202003799] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Indexed: 11/12/2022]
Abstract
The preparation of a molecule with two alkyl‐tethered silylium‐ion sites from the corresponding bis(hydrosilanes) by two‐fold hydride abstraction is reported. The length of the conformationally flexible alkyl bridge is crucial as otherwise the hydride abstraction stops at the stage of a cyclic bissilylated hydronium ion. With an ethylene tether, the open form of the hydronium‐ion intermediate is energetically accessible and engages in another hydride abstraction. The resulting bis(silylium) ion has been NMR spectroscopically and structurally characterized. Related systems based on rigid naphthalen‐n,m‐diyl platforms can only be converted into the dications when the positively charged silylium‐ion units are remote from each other (1,8 versus 1,5 and 2,6).
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Affiliation(s)
- Qian Wu
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Avijit Roy
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Guoqiang Wang
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Elisabeth Irran
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Hendrik F T Klare
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623, Berlin, Germany
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Avdeeva V, Kravchenko E, Gippius A, Vologzhanina A, Ugolkova E, Minin V, Malinina E, Kuznetsov N. Synthesis, structure, and physicochemical properties of triply-bridged binuclear copper(II) complex [Cu2Phen2(µ-CH3CO2)2(µ-OH)]2[B10Cl10]. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.12.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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8
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Riddlestone IM, Keller S, Kirschenmann F, Schorpp M, Krossing I. Towards Weakly Coordinating Anions with the Extremely Electron Withdrawing Perfluoropyridinoxy Ligand –OC
5
F
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N. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801136] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ian M. Riddlestone
- Institut für Anorganische und Analytische Chemie Albert‐Ludwigs‐Universität Freiburg Albertstraße 21 79104 Freiburg Germany
| | - Sarah Keller
- Institut für Anorganische und Analytische Chemie Albert‐Ludwigs‐Universität Freiburg Albertstraße 21 79104 Freiburg Germany
| | - Florian Kirschenmann
- Institut für Anorganische und Analytische Chemie Albert‐Ludwigs‐Universität Freiburg Albertstraße 21 79104 Freiburg Germany
| | - Marcel Schorpp
- Institut für Anorganische und Analytische Chemie Albert‐Ludwigs‐Universität Freiburg Albertstraße 21 79104 Freiburg Germany
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie Albert‐Ludwigs‐Universität Freiburg Albertstraße 21 79104 Freiburg Germany
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Jenne C, Wegener B. Silver Salts of the Weakly Coordinating Anion [Me3
NB12
Cl11
]-. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800358] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Carsten Jenne
- Anorganische Chemie; Fakultät für Mathematik und Naturwissenschaften; Bergische Universität Wuppertal; Gaußstr. 20 42119 Wuppertal Germany
| | - Bianca Wegener
- Anorganische Chemie; Fakultät für Mathematik und Naturwissenschaften; Bergische Universität Wuppertal; Gaußstr. 20 42119 Wuppertal Germany
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Lin F, Yu JL, Shen Y, Zhang SQ, Spingler B, Liu J, Hong X, Duttwyler S. Palladium-Catalyzed Selective Five-Fold Cascade Arylation of the 12-Vertex Monocarborane Anion by B–H Activation. J Am Chem Soc 2018; 140:13798-13807. [DOI: 10.1021/jacs.8b07872] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Furong Lin
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Jing-Lu Yu
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Yunjun Shen
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Shuo-Qing Zhang
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Bernhard Spingler
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jiyong Liu
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Simon Duttwyler
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
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11
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Hepp A, Labbow R, Reiß F, Schulz A, Villinger A. Carba-closo
-dodecaborates - Synthesis, Structure, and Energetics. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800219] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alexander Hepp
- Institut für Anorganische und Analytische Chemie; Universität Münster; Correnstrasse 28-30 48149 Münster Germany
| | - René Labbow
- Institut für Chemie; Abteilung für Anorganische Chemie; Universität Rostock; Albert-Einstein-Strasse 3a 18059 Rostock Germany
| | - Fabian Reiß
- Leibniz-Institut für Katalyse e.V.; Universität Rostock; Albert-Einstein-Strasse 29a 18059 Rostock Deutschland
| | - Axel Schulz
- Institut für Chemie; Abteilung für Anorganische Chemie; Universität Rostock; Albert-Einstein-Strasse 3a 18059 Rostock Germany
- Leibniz-Institut für Katalyse e.V.; Universität Rostock; Albert-Einstein-Strasse 29a 18059 Rostock Deutschland
| | - Alexander Villinger
- Institut für Chemie; Abteilung für Anorganische Chemie; Universität Rostock; Albert-Einstein-Strasse 3a 18059 Rostock Germany
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12
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Lin F, Shen Y, Zhang Y, Sun Y, Liu J, Duttwyler S. Fusing Carborane Carboxylic Acids with Alkynes: 3D Analogues of Isocoumarins via Regioselective B−H Activation. Chemistry 2017; 24:551-555. [DOI: 10.1002/chem.201703802] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Furong Lin
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yunjun Shen
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yuanbin Zhang
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yuji Sun
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Jiyong Liu
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Simon Duttwyler
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
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13
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Shen Y, Pan Y, Zhang K, Liang X, Liu J, Spingler B, Duttwyler S. B–H functionalization of the monocarba-closo-dodecaborate anion by rhodium and iridium catalysis. Dalton Trans 2017; 46:3135-3140. [DOI: 10.1039/c7dt00269f] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The regioselective derivatization of the monocarba-closo-dodecaborate anion via catalytic B–H bond activation is reported.
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Affiliation(s)
- Yunjun Shen
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Yani Pan
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Kang Zhang
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Xuewei Liang
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Jiyong Liu
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | | | - Simon Duttwyler
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
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Saleh M, Powell DR, Wehmschulte RJ. Chlorination of 1-Carba-closo-dodecaborate and 1-Ammonio-closo-dodecaborate Anions. Inorg Chem 2016; 55:10617-10627. [DOI: 10.1021/acs.inorgchem.6b01867] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mahmoud Saleh
- Department of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
| | - Douglas R. Powell
- Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019-5251, United States
| | - Rudolf J. Wehmschulte
- Department of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, United States
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15
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Secondary interactions in decachloro-closo-decaborates R2[B10Cl10] (R = Et3NH+, Ph4P+, and [Ag(NH3)2]+): 35Cl NQR, PW-DFT, and X-ray studies. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.03.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Silver and Copper Complexes with closo-Polyhedral Borane, Carborane and Metallacarborane Anions: Synthesis and X-ray Structure. CRYSTALS 2016. [DOI: 10.3390/cryst6050060] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Douvris C, Michl J. Update 1 of:Chemistry of the Carba-closo-dodecaborate(−) Anion, CB11H12–. Chem Rev 2014; 113:PR179-233. [PMID: 23944158 DOI: 10.1021/cr400059k] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christos Douvris
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
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Lavallo V, Wright JH, Tham FS, Quinlivan S. Perhalogenated Carba-closo-dodecaborate Anions as Ligand Substituents: Applications in Gold Catalysis. Angew Chem Int Ed Engl 2013; 52:3172-6. [DOI: 10.1002/anie.201209107] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 01/18/2013] [Indexed: 11/10/2022]
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19
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Lavallo V, Wright JH, Tham FS, Quinlivan S. Perhalogenated Carba-closo-dodecaborate Anions as Ligand Substituents: Applications in Gold Catalysis. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209107] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Wu CJ, Sie MJ, Hsiao HL, Chen JD. Diverse Ag(i) complexes constructed from methyl-4-(5-halopyrimidin-2-ylcarbamoyl)benzoate ligands: roles of the halogen atom and anion. CrystEngComm 2011. [DOI: 10.1039/c1ce05102d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Tsang CW, Yang QC, Mak CWT, Xie ZW. Synthesis and Structure of Solvated Protons Incorporating Weakly Coordinating Anions. Precursors of Superacids†. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.20020201116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Cameron TS, Nikiforov GB, Passmore J, Rautiainen JM. Preparation, structure and analysis of the bonding in the molecular entity (OSO)2Li{[AlF(ORF)3]Li[Al(ORF)4]} (RF = C(CF3)3). Dalton Trans 2010; 39:2587-96. [DOI: 10.1039/b923291e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Li Y, Jiang Q, Li Y, Yan H, Bregadze VI. Cobalt-Mediated B−H Activation and Cyclopentadienyl-Participated Diels−Alder Addition in the Reaction of a 16e CpCo Complex Containing an o-Carborane-1,2-dithiolato Ligand with HC≡C−C(O)Ph. Inorg Chem 2009; 49:4-6. [DOI: 10.1021/ic901970b] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuguang Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Jiangsu 210093, China
| | - Qibai Jiang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Jiangsu 210093, China
| | - Yizhi Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Jiangsu 210093, China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Jiangsu 210093, China
| | - Vladimir I. Bregadze
- A. N. Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, Moscow 119991, Russia
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Siu PW, Gates DP. HL2[P(1,2-O2C6H4)3] (L = DMSO or DMF): A Convenient Proton Source with a Weakly Basic Phosphorus(V) Anion. Organometallics 2009. [DOI: 10.1021/om9003187] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul W. Siu
- Department of Chemistry, University of British Columbia, Vancouver, 2036 Main Mall, British Columbia, Canada V6T 1Z1
| | - Derek P. Gates
- Department of Chemistry, University of British Columbia, Vancouver, 2036 Main Mall, British Columbia, Canada V6T 1Z1
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Bernsdorf A, Brand H, Hellmann R, Köckerling M, Schulz A, Villinger A, Voss K. Synthesis, Structure, and Bonding of Weakly Coordinating Anions Based on CN Adducts. J Am Chem Soc 2009; 131:8958-70. [DOI: 10.1021/ja902450b] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Arne Bernsdorf
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
| | - Harald Brand
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
| | - Robert Hellmann
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
| | - Martin Köckerling
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
| | - Axel Schulz
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
| | - Alexander Villinger
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
| | - Karsten Voss
- Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock, Germany, and Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
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Tsupreva VN, Filippov OA, Titov AA, Krylova AI, Sivaev IB, Bregadze VI, Epstein LM, Shubina ES. Interaction of polyhedral boron hydride anions [B10H10]2− and [B12H12]2− with cyclic copper and silver 3,5-bis(trifluoromethyl)pyrazolate complexes. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.11.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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27
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Finze M. Regioselective Monoiodination of Carba-closo-dodecaborates: M[7-I-12-X-closo-CB11H10] (M = Cs+, [Et4N]+; X = F, Cl, Br, OH). Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Chandran SK, Thakuria R, Nangia A. Silver(I) complexes of N-4-halophenyl-N′-4-pyridyl ureas. Isostructurality, urea⋯nitrate hydrogen bonding, and Ag⋯halogen interaction. CrystEngComm 2008. [DOI: 10.1039/b810549a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Körbe S, Schreiber PJ, Michl J. Chemistry of the Carba-closo-dodecaborate(−) Anion, CB11H12-. Chem Rev 2006; 106:5208-49. [PMID: 17165686 DOI: 10.1021/cr050548u] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stefanie Körbe
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
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30
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Krossing I, Reisinger A. Chemistry with weakly-coordinating fluorinated alkoxyaluminate anions: Gas phase cations in condensed phases? Coord Chem Rev 2006. [DOI: 10.1016/j.ccr.2005.10.023] [Citation(s) in RCA: 188] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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31
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Carr MJ, Franken A, Macías R, Kennedy JD. Twelve-vertex polyhedral carbaborane chemistry. Isostructural cations and anions: The ‘globule–globule’ salt [H3NCH2C2B10H11][H3CCH2CB11H11]. Polyhedron 2006. [DOI: 10.1016/j.poly.2005.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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32
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Moxham GL, Douglas TM, Brayshaw SK, Kociok-Köhn G, Lowe JP, Weller AS. The role of halogenated carborane monoanions in olefin hydrogenation catalysed by cationic iridium phosphine complexes. Dalton Trans 2006:5492-505. [PMID: 17117219 DOI: 10.1039/b612049k] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iridium hydridophosphine complexes of general formula [Ir(PR3)2H2(anion)](PR3= PPh3, PMe2Ph; anion =[1-closo-CB(11)H(6)Cl(6)]-, [1-closo-CB(11)H(6)I(6)]-, [BAr(F)4]-) have been prepared by hydrogenation of cyclooctadiene precursor complexes. Solid-state structures of selected examples of these complexes reveal intimate contacts between the carborane anion and cation, with the anion binding through two lower-hemisphere halogen ligands. In CD2Cl2 solution the very weakly coordinating anions [1-closo-CB(11)H(6)Cl(6)]- and [BAr(F)4]- are suggested to favour the formation of solvent complexes such as [Ir(PR3)2H2(solvent)n][anion], while the [1-closo-CB(11)H(6)I(6)]- anion forms a tightly bound complex with the cationic iridium fragment. Calculated DeltaG values for anion reorganisation in d8-toluene reflect this difference in interaction between the anions and cation. With the bulky anion [1-closo-CB(11)Me(5)I(6)]- different complexes are formed: Ir(PPh3)H2(1-closo-HCB(11)Me(5)I(6)) and [(PPh3)3Ir(H2)H2][1-closo-HCB(11)Me(5)I(6)] which have been characterised spectroscopically. Diffusion measurements in CD2Cl2 are also consistent with larger, solvent coordinated, complexes for the more weakly coordinating anions and a tighter interaction between anion and cation for [1-closo-CB(11)H(6)I(6)]-. All the complexes show some ion-paring in solution. Comparison with data previously reported for the [1-closo-CB(11)H(6)Br(6)]- anion shows that this anion--as expected--fits between [1-closo-CB(11)H(6)Cl(6)]- and [1-closo-CB(11)H(6)I(6)]- in terms of coordinating ability. Although not coordinating, the large [1-closo-CB(11)H(6)Cl(6)]- and [BAr(F)4)]- anions do provide some stabilisation towards the metal centre, as decomposition to the hydride bridged dimer [Ir2(PPh3)4H5]+ is retarded. This is in contrast to the [PF6]- salt where decomposition is immediate. As expected, complexes with the smaller phosphine PMe2Ph form tighter interactions with the carborane anions. These observations on the interaction between anion and cation in solution are reflected in benchmark hydrogenation studies that show a significant attenuation in rate of hydrogenation of cyclohexane on using the [1-closo-CB(11)H(6)I(6)]- anion or complexes with the PMe2Ph phosphine. We also comment on the reusability of the catalysts and their tolerance to water and oxygen impurities. Overall the catalyst with the [1-closo-CB(11)H(6)Br(6)]- anion shows the best combination of rate of hydrogenation, reusability and tolerance to impurities.
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Affiliation(s)
- Gemma L Moxham
- Department of Chemistry, University of Bath, Bath, UKBA2 7AY
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33
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Sumby CJ, Carr MJ, Franken A, Kennedy JD, Kilner CA, Hardie MJ. Crystal-packing motifs of [Ag4L4]4+ star-burst tetrahedra. NEW J CHEM 2006. [DOI: 10.1039/b609356f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Ronson TK, Adams H, Ward MD. Mononuclear and Polynuclear Chain Complexes of a Series of Multinucleating N/S Donor Ligands. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500704] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tanya K. Ronson
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK
| | - Harry Adams
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK
| | - Michael D. Ward
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK
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35
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Jemmis ED, Pathak B, Anoop A. Condensed Two- and Three-Dimensional Aromatic Systems: A Theoretical Study on the Relative Stabilities of Isomers of CB19H16+, B20H15Cl, and B20H14Cl2 and Comparison to B12H10Cl22-, C6H4Cl2, C10H7Cl, and C10H6Cl2. Inorg Chem 2005; 44:7184-8. [PMID: 16180882 DOI: 10.1021/ic050730d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
DFT studies (B3LYP/6-31G) on mono- and dichloro derivatives of benzene, naphthalene, B12H12(2-), four-atom-sharing condensed systems B20H16, and monocarborane isomers of B20H16 are used to compare the variation of relative stability and aromaticity between condensed aromatics. The trends in the variation of the relative energies and aromaticity in these two- and three-dimensional systems are similar. Aromaticity, estimated by NICS values, does not change considerably with condensation or substitution. The minor variation in the relative energies of the isomers of chloro derivatives is explained by the topological charge stabilization rule of Gimarc. The compatibility of the cap and ring orbitals decides the relative stability of CB19H16+.
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36
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Lidrissi C, Romerosa A, Saoud M, Serrano-Ruiz M, Gonsalvi L, Peruzzini M. Stable, Water-Soluble Pta-Based Ru–Ag Organometallic Polymers. Angew Chem Int Ed Engl 2005; 44:2568-72. [PMID: 15782373 DOI: 10.1002/anie.200462790] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chaker Lidrissi
- Area de Quimica Inorganica, Universidad de Almería, 04071 Almería, Spain
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37
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Lidrissi C, Romerosa A, Saoud M, Serrano-Ruiz M, Gonsalvi L, Peruzzini M. Stable, Water-Soluble Pta-Based Ru–Ag Organometallic Polymers. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462790] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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38
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Hardie MJ, Ahmad R, Sumby CJ. Network structures of cyclotriveratrylene and its derivatives. NEW J CHEM 2005. [DOI: 10.1039/b505579b] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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40
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Elliott EL, Hernández GA, Linden A, Siegel JS. Anion mediated structural motifs in silver(i) complexes with corannulene. Org Biomol Chem 2005; 3:407-13. [PMID: 15678177 DOI: 10.1039/b411987h] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of three new silver(I) complexes with corannulene is reported. In the crystal these complexes form extended networks of Ag(+) ions, corannulene nuclei, and counterions, similar to the networks reported for Ag(+) with other polynuclear aromatic hydrocarbons (PAHs). The preferred Ag(+)-arene interaction is compared with the model developed by Kochi. The crystal motifs can be described by a classification scheme analogous to that developed by Etter for hydrogen-bonded networks in solids. The effect of counterion variation (ClO(4)(-), O(3)SCF(3)(-), BF(4)(-)) is noted to be substantial. Thus, although one can categorize the various networks, it is hard to predict an expected packing pattern on the basis of preferred binding in the metal/organic complex alone.
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Affiliation(s)
- Eric L Elliott
- Department of Chemistry, University of California, San Diego, La Jolla, California, USA
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41
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Westcott A, Whitford N, Hardie MJ. Coordination polymers with carborane anions: silver dinitrile complexes. Inorg Chem 2004; 43:3663-72. [PMID: 15180421 DOI: 10.1021/ic049849x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Crystalline materials have been isolated and characterized from mixing the silver carborane salts Ag(CB(11)H(12)) or Ag[Co(C(2)B(9)H(11))(2)] with nitrile ligands, either terminal acetonitrile or potentially bridging alkanedinitriles. Most of the complexes showed B-H...Ag interactions between the silver center and carborane anion. [Ag(acetonitrile)(2)(CB(11)H(12))] has a hexagonal network structure. [Ag(malonitrile)(2)(CB(11)H(12))] is a discrete dimeric complex, while [Ag(4)(succinonitrile)(5)(CB(11)H(12))(4)], [Ag(glutaronitrile)(2)][Co(C(2)B(9)H(12))(2)], and [Ag(glutaronitrile)[Co(C(2)B(9)H(11))(2)]] all show coordination chain structures. The carborane anions in [Ag(adiponitrile)[Co(C(2)B(9)H(11))(2)]] bridge between Ag centers to give a 3D CdSO(4)-related coordination polymer. The structure of [Ag(malonitrile)(2)](BF(4)) was also determined to have an unusual chiral diamondoid structure with a skewed 2-fold interpenetration.
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42
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Clarke AJ, Ingleson MJ, Kociok-Köhn G, Mahon MF, Patmore NJ, Rourke JP, Ruggiero GD, Weller AS. Silver−Phosphine Complexes of the Highly Methylated Carborane Monoanion [closo-1-H-CB11Me11]-. J Am Chem Soc 2004; 126:1503-17. [PMID: 14759209 DOI: 10.1021/ja038173m] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of the silver(I) salt of the highly methylated carborane anion [closo-1-H-CB(11)Me(11)](-) is described, Ag[closo-1-H-CB(11)Me(11)] 1, which in the solid state shows close intermolecular Ag...H(3)C contacts. Addition of various monodentate phosphines to 1 results in the formation of the complexes (R(3)P)Ag[closo-1-H-CB(11)Me(11)] [R = Ph, 2; cyclohexyl (C(6)H(11)), 3; (3,5-Me(2)-C(6)H(3)), 4]. All these complexes show close intermolecular Ag.H(3)C contacts in the solid state that are considerably shorter than the sum of the van der Waals radius of methyl (2.00 A) and the ionic radius of silver(I) (1.29 A). For 2 and 3 there are other close intermolecular Ag...H(3)C contacts in the solid state, arising from proximate carborane anions in the crystal lattice. Addition of methyl groups to the periphery of the phosphine ligand (complex 4) switches off the majority of these interactions, leaving essentially a single cage interacting with the cationic silver-phosphine fragment through three CH(3) groups. In solution (CD(2)Cl(2)) Ag...H(3)C contacts remain, as evidenced by both the downfield chemical shift change and the significant line-broadening observed for the cage methyl signals. These studies also show that the metal fragment is fluxional over the surface of the cage. The Ag...H(3)C interactions in solution may be switched off by addition of a stronger Lewis base than [closo-1-H-CB(11)Me(11)](-). Thus, addition of [NBu(4)][closo-1-H-CB(11)H(5)Br(6)] to 2 affords (Ph(3)P)Ag[closo-1-H-CB(11)H(5)Br(6)], while adding Et(2)O or PPh(3) affords the well-separated ion-pairs [(Ph(3)P)(L)Ag][closo-1-H-CB(11)Me(11)] (L = OEt(2) 5, PPh(3) 6,) both of which have been crystallographically characterized. DFT calculations on 2 (at the B3LYP/DZVP level) show small energy differences between the possible coordination isomers of this compound, with the favored geometry being one in which the [(Ph(3)P)Ag](+) fragment interacts with three of the [BCH(3)] vertices on the lower surface of the cage, similar to the experimentally observed structure of 4.
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Affiliation(s)
- Adam J Clarke
- Department of Chemistry, University of Bath, Bath BA2 7AY, UK
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43
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Franken A, Bullen NJ, Jelínek T, Thornton-Pett M, Teat SJ, Clegg W, Kennedy JD, Hardie MJ. Structural chemistry of halogenated monocarbaboranes: the extended structures of Cs[1-HCB9H4Br5], Cs[1-HCB11H5Cl6] and Cs[1-HCB11H5Br6]. NEW J CHEM 2004. [DOI: 10.1039/b410929e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Ivanov SV, Davis JA, Miller SM, Anderson OP, Strauss SH. Synthesis and characterization of ammonioundecafluoro-closo-dodecaborates(1-). New superweak anions. Inorg Chem 2003; 42:4489-91. [PMID: 12870929 DOI: 10.1021/ic0344160] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ammonioborane monoanion H(3)NB(12)H(11)(-) was per-B-fluorinated with elemental fluorine in liquid hydrogen fluoride to yield the first member of a new class of weakly coordinating anions, H(3)NB(12)F(11)(-) (isolated as [N(n-Bu)(4)](2)[H(2)NB(12)F(11)] in 41% yield). The pK(a) of the H(3)NB(12)F(11)(-) anion is 9.6. Several salts of the tri-N-alkylated anions Me(3)NB(12)F(11)(-) and Dd(3)NB(12)F(11)(-) (Dd = n-C(12)H(25)) were also prepared. The structure of [CPh(3)][Me(3)NB(12)F(11)] was determined by single-crystal X-ray diffraction: monoclinic, space group P2(1)/c, a = 18.053(3) A, b = 33.139(5) A, c = 9.600(2) A, beta = 91.459(4) degrees, V = 5742(2) A(3), Z = 8, T = 173(2) K, R(1) = 0.045. It revealed that the only direct interactions between the undecafluoroammonioborate monoanions and the trityl cations in the two independent ion pairs were long and weak BF...CPh(3) interactions of 2.992(6) and 2.942(6) A. Salts of the new anions were chemically, electrochemically, and thermally stable. The conductivity of Li(Me(3)NB(12)F(11)) in dimethoxyethane was comparable to that of LiPF(6) but less than half the value of Li(1-Me-CB(11)F(11)).
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Affiliation(s)
- Sergei V Ivanov
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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45
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Tsang CW, Yang Q, Mak TCW, Xie Z. Synthesis and crystal structure of silver and argentate complexes of mixed halocarborane anions, (C5H5N)2Ag(1-H?CB11Br5I6)(C5H5N) and [{(CH3CN)4Ag3}{Ag(CB11I5Br6)2}]n. Appl Organomet Chem 2003. [DOI: 10.1002/aoc.455] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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Fox MA, Mahon MF, Patmore NJ, Weller AS. Solution and solid-state structure of the anion [Ag(2)[closo-CB(11)H(12)](4)](2-). Inorg Chem 2002; 41:4567-73. [PMID: 12184776 DOI: 10.1021/ic025730h] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Addition of the carbene 1,3-dimesitylimidazol-2-ylidene (IMes) to a toluene solution of Ag[closo-CB(11)H(12)] results in the formation of the complex [(IMes)(2)Ag](2)[Ag(2)[closo-CB(11)H(12)](4)], the anionic component of which contains two silver(I) centers bridged by two carboranes in addition to one terminally bound carborane on each metal, in the solid-state. Comparison of the observed (11)B[(1)H] NMR chemical shifts of [(IMes)(2)Ag](2)[Ag(2)[closo-CB(11)H(12)](4)] or Ag[closo-CB(11)H(12)] with [NBu(4)][closo-CB(11)H(12)] in CD(2)Cl(2) demonstrates that the silver ion interacts significantly with the cage in solution. Theoretical investigations using the ab initio/GIAO/NMR method of [closo-CB(11)H(12)](-) and Na[closo-CB(11)H(12)] as model geometries for the silver salts support experimental evidence for these Ag...[BH] interactions in solution.
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Affiliation(s)
- Mark A Fox
- Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
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47
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Jelínek T, Thornton-Pett M, Kennedy JD. Monocarbaborane Anion Chemistry. Syntheses and Structures Within the closo Nine-Vertex System. ACTA ACUST UNITED AC 2002. [DOI: 10.1135/cccc20021035] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Reaction of HCHO with B10H14 under aqueous alkaline conditions yields the arachno 10-vertex [6-CB9H14]- anion 2 (60%) which upon solid-state thermolysis as its Cs+ salt yields the closo 9-vertex [4-CB8H9]- anion 1 (45%). MeCHO reacts similarly to give the C-methylated arachno [6-Me-6-CB9H13]- anion 4 (37%) which upon thermolysis gives the closo [4-Me-4-CB8H8]- anion 3 (72%). PhCHO with B10H14 under alkaline conditions gives the nido 10-vertex [6-Ph-6-CB9H11]- anion 6 (85%) which upon thermolysis of its [NEt4]+ salt gives the closo [4-Ph-4-CB8H8]- anion 5 (73%). In a preliminary iodination investigation, unsubstituted closo anion 1 with elemental I2 in CH2Cl2 gives approximately equimolar closo [4-CB8H8-3-I]- 12 and closo [4-CB8H8-5-I]- 13 (ca 60%) and smaller amounts of closo [4-CB8H7-5,6-I2]- 14 (12%). The [NEt4]+ salts of 1, 3 and 5 are characterised crystallographically, as is the [PMePh3]+ salt of 12.
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48
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McKee ML. Proposed fluorination mechanism of CB(5)H(6)(-) and CB(9)H(10)(-) with HF. Evidence of kinetic control in the formation of 2-CB(5)H(5)F(-) and 6-CB(9)H(9)F(-). Inorg Chem 2001; 40:5612-9. [PMID: 11599961 DOI: 10.1021/ic010176h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Two pathways have been considered in the fluorination of CB(5)H(6)(-) and CB(9)H(10)(-) by HF. In the ionic HF fluorination pathway, the monocarborane anion cage is first protonated in a BBB face followed by H(2) elimination and fluoride anion addition. In the covalent HF fluorination pathway, HF is first coordinated through hydrogen to the BBB face. Next, the fluorine can add to either an axial or equatorial boron atom which opens the cage to a nido structure with an endo fluoride substituent. Endo to exo rearrangement occurs with a small activation barrier followed by H(2) elimination. In both pathways, fluorination at the equatorial boron position is predicted to have smaller activation barriers even though substitution at the axial position leads to the more stable products.
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Affiliation(s)
- M L McKee
- Department of Chemistry, Auburn University, Auburn, Alabama 36849, USA
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49
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Jemmis ED, Ramalingam M, Jayasree EG. CationicClosoCarboranes-Promising Weakly Coordinating Ions. J Comput Chem 2001. [DOI: 10.1002/jcc.1107] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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