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Coordination complexes featuring bidentate κN, κI-8-iodoquinoline. J COORD CHEM 2022. [DOI: 10.1080/00958972.2021.2024521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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2
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Castillo Molina DA, Wititsuwannakul T, Hampel F, Hall MB, Gladysz JA. Syntheses, Structures, Reactivities, and Basicities of Quinolinyl and Isoquinolinyl Complexes of an Electron Rich Chiral Rhenium Fragment and Their Electrophilic Addition Products. Chemistry 2021; 27:13399-13417. [PMID: 34228842 DOI: 10.1002/chem.202101949] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Indexed: 11/10/2022]
Abstract
Reactions of Li+ [(η5 -C5 H5 )Re(NO)(PPh3 )]- with 2- and 4-chloroquinoline or 1-chloroisoquinoline give the corresponding σ quinolinyl and isoquinolinyl complexes 3, 6, and 8. With 3 and 8 there is further protonation to yield HCl adducts, but additions of KH give the free bases. Treatment of 3 with HBF4 ⋅OEt2 or H(OEt2 )2 + BArf - gives the quinolinium salts [(η5 -C5 H5 )Re(NO)(PPh3 )(C(NH)C(CH)4 C(CH)(CH))]+ X- (3-H+ X- ; X- =BF4 - /BArf - , 94-98 %). Addition of CF3 SO3 CH3 to 3, 6, or 8 affords the corresponding N-methyl quinolinium salts. In the case of [(η5 -C5 H5 )Re(NO)(PPh3 )(C(NCH3 )C(CH)4 C(CH)(CH))]+ CF3 SO3 - (3-CH3 + CF3 SO3 - ), addition of CH3 Li gives the dihydroquinolinium complex (SRe RC ,RRe SC )-[(η5 -C5 H5 )Re(NO)(PPh3 )(C(NCH3 )C(CH)4 C(CHCH3 )(CH2 ))]+ CF3 SO3 - ((SRe RC ,RRe SC )-5+ CF3 SO3 - , 76 %) in diastereomerically pure form. Crystal structures of 3-H+ BArf - , 3-CH3 + CF3 SO3 - , (SRe RC , RRe SC )-5+ Cl- , and 6-CH3 + CF3 SO3 - show that the quinolinium ligands adopt Re⋅⋅⋅C conformations that maximize overlap of their acceptor orbitals with the rhenium fragment HOMO, minimize steric interactions with the bulky PPh3 ligand, and promote various π interactions. NMR experiments establish the Brønsted basicity order 3>8>6, with Ka (BH+ ) values >10 orders of magnitude greater than the parent heterocycles, although they remain less active nucleophilic catalysts in the reactions tested. DFT calculations provide additional insights regarding Re⋅⋅⋅C bonding and conformations, basicities, and the stereochemistry of CH3 Li addition.
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Affiliation(s)
- Dante A Castillo Molina
- Institut für Organische Chemie and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 42, 91054, Erlangen, Germany
| | - Taveechai Wititsuwannakul
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas, 77842-3012, USA
| | - Frank Hampel
- Institut für Organische Chemie and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 42, 91054, Erlangen, Germany
| | - Michael B Hall
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas, 77842-3012, USA
| | - John A Gladysz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas, 77842-3012, USA
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Tagne Kuate AC, Lalancette RA, Bockfeld D, Tamm M, Jäkle F. Palladium(0) complexes of diferrocenylmercury diphosphines: synthesis, X-ray structure analyses, catalytic isomerization, and C-Cl bond activation. Dalton Trans 2021; 50:4512-4518. [PMID: 33687041 DOI: 10.1039/d1dt00641j] [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
Palladium(0) phosphine complexes are of great importance as catalysts in numerous bond formation reactions that involve oxidative addition of substrates. Highly active catalysts with labile ligands are of particular interest but can be challenging to isolate and structurally characterize. We investigate here the synthesis and chemical reactivity of Pd0 complexes that contain geometrically adaptable diferrocenylmercury-bridged diphosphine chelate ligands (L) in combination with a labile dibenzylideneacetone (dba) ligand. The diastereomeric diphosphines 1a (pSpR, meso-isomer) and 1b (pSpS-isomer) differ in the orientation of the ferrocene moieties relative to the central Ph2PC5H3-Hg-C5H3PPh2 bridging entity. The structurally distinct trigonal LPd0(dba) complexes 2a (meso) and 2b (pSpS) are obtained upon treatment with Pd(dba)2. A competition reaction reveals that 1b reacts faster than 1a with Pd(dba)2. Unexpectedly, catalytic interconversion of 1a (meso) into 1b (rac) is observed at room temperature in the presence of only catalytic amounts of Pd(dba)2. Both Pd0 complexes, 2a and 2b, readily undergo oxidative addition into the C-Cl bond of CH2Cl2 at moderate temperatures with formation of the square-planar trans-chelate complexes LPdIICl(CH2Cl) (3a, 3b). Kinetic studies reveal a significantly higher reaction rate for the meso-isomer 2a in comparison to (pSpS)-2b.
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Affiliation(s)
- Alain C Tagne Kuate
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA.
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4
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Kumari K, Drew MG, Singh N. Impact of ligand substituents on the crystal structures, optical and conducting properties of phenylmercury(II) β-oxodithioester complexes. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Raju S, Singh HB, Butcher RJ. Metallophilic interactions: observations of the shortest metallophilicinteractions between closed shell (d10⋯d10, d10⋯d8, d8⋯d8) metal ions [M⋯M′ M = Hg(ii) and Pd(ii) and M′ = Cu(i), Ag(i), Au(i), and Pd(ii)]. Dalton Trans 2020; 49:9099-9117. [PMID: 32573621 DOI: 10.1039/d0dt01008a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The salt metathesis reaction of two equivalents of 8-lithioquinoline (C6H6NLi) with HgBr2 afforded bis(quinoline-8-yl)mercury, [(C6H6N)2Hg].
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Affiliation(s)
- Saravanan Raju
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Harkesh B. Singh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Ray J. Butcher
- Department of Chemistry
- Howard University
- Washington DC 20059
- USA
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Tagne Kuate AC, Lalancette RA, Bannenberg T, Tamm M, Jäkle F. Diferrocenylmercury diphosphine diastereomers with unique geometries: trans-chelation at Pd(ii) with short Hg(ii)Pd(ii) contacts. Dalton Trans 2019; 48:13430-13439. [PMID: 31441475 DOI: 10.1039/c9dt02728a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diphosphine chelate ligands are essential in many catalytic processes with both the electronic structure and bite angle having a dramatic influence on the coordination behavior and catalytic performance. The synthesis of a new class of diferrocenylmercury-supported diphosphine chelate ligands was accomplished by the reaction of (ortho-diphenylphosphino)ferrocenyl sulfinate (2) with t-BuLi, followed by treatment with mercury(ii) chloride. Two diastereomers, 4a (pSpR-, meso-isomer) and 4b (pSpS-isomer), differ in the orientation of the ferrocene moiety relative to the central Ph2PC5H3-Hg-C5H3PPh2 bridging entity. They were isolated independently and fully characterized in solution and in the solid state by single crystal X-ray diffraction analysis. Key characteristics of these ligands are their exceptionally wide and flexible bite angles and the unique stereochemical environment that is achieved upon coordination to transition metals. Complexation to Pd(ii)Cl2 gives rise to unusual square-planar trans-chelate complexes 5a (meso) and 5b (pSpS). In competition reactions, 4a and 4b show similar reactivity toward Pd(ii)Cl2. The molecular structures of 5a and 5b exhibit short PdHg contacts, possibly indicating secondary metallophilic interactions as further evidenced by bond-critical points between Pd and Hg that were identified by AIM analyses.
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Affiliation(s)
- Alain C Tagne Kuate
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA. and Department of Chemistry, Faculty of Sciences, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Roger A Lalancette
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA.
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA.
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Tagne Kuate AC, Lalancette RA, Jäkle F. Mechanistic Studies into the Sn/Hg Exchange Reaction of 1,2-Fc(PPh2)(SnMe3) with HgCl2: Competitive Sn–Me over Sn–Fc Cleavage in Noncoordinating Solvents. Organometallics 2019. [DOI: 10.1021/acs.organomet.8b00862] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
- Department of Chemistry, Faculty of Sciences, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Roger A. Lalancette
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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Tagne Kuate AC, Lalancette RA, Bannenberg T, Jäkle F. Diferrocenylmercury‐Bridged Diphosphine: A Chiral, Ambiphilic, and Redox‐Active Bidentate Ligand. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
- Department of Chemistry Faculty of Science University of Dschang P.O. Box 67 Dschang Cameroon
| | - Roger A. Lalancette
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Frieder Jäkle
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
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Tagne Kuate AC, Lalancette RA, Bannenberg T, Jäkle F. Diferrocenylmercury‐Bridged Diphosphine: A Chiral, Ambiphilic, and Redox‐Active Bidentate Ligand. Angew Chem Int Ed Engl 2018; 57:6552-6557. [DOI: 10.1002/anie.201803086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
- Department of Chemistry Faculty of Science University of Dschang P.O. Box 67 Dschang Cameroon
| | - Roger A. Lalancette
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Frieder Jäkle
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
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10
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Son JH, Tamang SR, Fostvedt JI, Hoefelmeyer JD. Dehydrodechlorination of Methylene Chloride, Chloroform, and Chlorodiphenylmethane in the Presence of Ga/N Lewis Pairs. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jung-Ho Son
- Department of Chemistry, University of South Dakota, 414 E. Clark Street, Vermillion, South Dakota 57069, United States
| | - Sem Raj Tamang
- Department of Chemistry, University of South Dakota, 414 E. Clark Street, Vermillion, South Dakota 57069, United States
| | - Jade I. Fostvedt
- Department of Chemistry, University of South Dakota, 414 E. Clark Street, Vermillion, South Dakota 57069, United States
| | - James D. Hoefelmeyer
- Department of Chemistry, University of South Dakota, 414 E. Clark Street, Vermillion, South Dakota 57069, United States
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11
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Wu C, Zhao JL, Jiang XK, Wang CZ, Ni XL, Zeng X, Redshaw C, Yamato T. A novel fluorescence “on–off–on” chemosensor for Hg2+via a water-assistant blocking heavy atom effect. Dalton Trans 2016; 45:14948-53. [DOI: 10.1039/c6dt02274j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The heavy atom effect and blocking thereof were demonstrated within the same system by the use of a C3-symmetric homooxacalix[3]arene scaffold.
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Affiliation(s)
- Chong Wu
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga 840-8502
- Japan
| | - Jiang-Lin Zhao
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga 840-8502
- Japan
| | - Xue-Kai Jiang
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga 840-8502
- Japan
| | - Chuan-Zeng Wang
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga 840-8502
- Japan
| | - Xin-Long Ni
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province
- Guizhou University
- Guiyang
- China
| | - Xi Zeng
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province
- Guizhou University
- Guiyang
- China
| | - Carl Redshaw
- Department of Chemistry
- The University of Hull
- Hull
- UK
| | - Takehiko Yamato
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Saga University
- Saga 840-8502
- Japan
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12
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Manceau A, Lemouchi C, Rovezzi M, Lanson M, Glatzel P, Nagy KL, Gautier-Luneau I, Joly Y, Enescu M. Structure, Bonding, and Stability of Mercury Complexes with Thiolate and Thioether Ligands from High-Resolution XANES Spectroscopy and First-Principles Calculations. Inorg Chem 2015; 54:11776-91. [DOI: 10.1021/acs.inorgchem.5b01932] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Mauro Rovezzi
- European Synchrotron Radiation Facility (ESRF), 71 Rue des Martyrs, 38000 Grenoble, France
| | | | - Pieter Glatzel
- European Synchrotron Radiation Facility (ESRF), 71 Rue des Martyrs, 38000 Grenoble, France
| | - Kathryn L. Nagy
- Department of Earth and Environmental Sciences, University of Illinois at Chicago, MC-186, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | | | | | - Mironel Enescu
- Laboratoire
Chrono Environnement, Université de Franche-Comté, CNRS, 25030 Besançon, France
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Son JH, Tamang SR, Yarbrough JC, Hoefelmeyer JD. Hydrolysis of 8-(pinacolboranyl)quinoline: where is the 8-quinolylboronic acid? ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2015. [DOI: 10.1515/znb-2015-0031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The compound 8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-quinoline was prepared and found to hydrolyze rapidly in air; however, the expected product (quinolin-8-yl)boronic acid was not observed. Instead, the (quinolinium-8-yl)trihydroxyborate zwitterion or an anhydride were observed depending on the conditions of hydrolysis. The two products are related to one another in the degree of hydration, and the two forms could be interconverted. Both hydrolysis products were structurally characterized. Additionally, a commercial sample of ‘8-quinolylboronic acid’ was actually found to be the anhydride. The results call into question whether monomeric (quinolin-8-yl)boronic acid can actually be isolated in the neutral Lewis base-free form.
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Affiliation(s)
- Jung-Ho Son
- Department of Chemistry, University of South Dakota, 414 E. Clark St., Vermillion, SD 57069, USA
| | - Sem Raj Tamang
- Department of Chemistry, University of South Dakota, 414 E. Clark St., Vermillion, SD 57069, USA
| | - Jason C. Yarbrough
- Department of Chemistry and Physics, West Texas A & M University, Canyon, TX 79016, USA
| | - James D. Hoefelmeyer
- Department of Chemistry, University of South Dakota, 414 E. Clark St., Vermillion, SD 57069, USA
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Affiliation(s)
- Hubert Schmidbaur
- Department
Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
- Chemistry
Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Annette Schier
- Department
Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
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Rajput G, Yadav MK, Drew MGB, Singh N. Influence of the ligand frameworks on the coordination environment and properties of new phenylmercury(ii) β-oxodithioester complexes. Dalton Trans 2015; 44:5909-16. [DOI: 10.1039/c4dt03816a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New luminescent PhHg(ii) dithioester complexes1–3have been synthesized and their crystal structures revealed O,S-coordination in1and2whereas less preferred S,S-coordination is observed in3. The keto-form of β-oxodithioester ligands is stabilized in these complexes.
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Affiliation(s)
- Gunjan Rajput
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Manoj Kumar Yadav
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | | | - Nanhai Singh
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi 221005
- India
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