1
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Heterotridentate organophosphines in Pt(κ3–P1C1P2)(X), (X=H, OL, NL, CL, Cl, Br or I) and Pt(κ3–P1P2C1)(Cl) derivatives-structural aspects. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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2
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Jadwiszczak MJ, Malinowski PJ. Stabilization of Potent Co(II)-based Lewis Acids with Weakly Basic Ligands. Chemistry 2023; 29:e202202976. [PMID: 36349978 DOI: 10.1002/chem.202202976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 11/08/2022] [Accepted: 11/09/2022] [Indexed: 11/11/2022]
Abstract
Pairing cations with weakly coordinating anions (WCAs) often renders them highly Lewis-acidic and extremely reactive. Although these features are often desirable, excessive reactivity of a cation may lead to decomposition of solvents or WCAs, hindering isolation, storage and practical use of such species. In an attempt to mitigate the problem, we introduce a series of readily available novel Co(II)-WCA salts with the metal center stabilized by weakly bound ligands: SO2 , halogenated acetonitriles and nitromethane with comprehensive characterization including structural, magnetic and spectral (IR) properties as well as thermal stability assessment. The use of these simple yet rarely encountered ligands yields mostly stable and highly Lewis-acidic complexes, in some cases comparable to SbF5 according to calculated Fluoride Ion Affinities. Highly acidic character of the species is also reflected in observed reactivity. Since the most convenient route towards the Co(II) complexes leads through silver salts, the results are complemented with characterization of a series of novel Ag(I) complexes with abovementioned ligands. Experimental part is backed with DFT calculations which gives insight into the structure and energetics of presented Co(II) complexes and shows that Co(II) center is available for substrates like olefins. This makes them good candidates for catalysts in reactions requiring the presence of Lewis acids.
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Affiliation(s)
- Michał J Jadwiszczak
- Centre of New Technologies, University of Warsaw, Banacha 2c, PL-02097, Warsaw, Poland
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3
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Tan C, Tinnermann H, Sung S, Kat LH, Young RD. Nonpalindromic Rhodium PCcarbeneP Pincer Complexes Featuring Electron-Deficient Phosphino Substituents. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Clarence Tan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Hendrik Tinnermann
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Simon Sung
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Li Heng Kat
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Rowan D. Young
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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4
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Peloquin AJ, Houck MB, McMillen CD, Iacono ST, Pennington WT. Perfluoropyridine as an Efficient, Tunable Scaffold for Bis(pyrazol‐1‐yl)pyridine Copper Complexes. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000150] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andrew J. Peloquin
- Department of Chemistry Clemson University 219 Hunter Laboratories 29634 Clemson SC USA
| | - Matthew B. Houck
- Department of Chemistry & Chemistry Research Center Laboratories for Advanced Materials United States Air Force Academy 2355 Fairchild Dr., Suite 2N‐225 80840 Colorado Springs CO USA
| | - Colin D. McMillen
- Department of Chemistry Clemson University 219 Hunter Laboratories 29634 Clemson SC USA
| | - Scott T. Iacono
- Department of Chemistry & Chemistry Research Center Laboratories for Advanced Materials United States Air Force Academy 2355 Fairchild Dr., Suite 2N‐225 80840 Colorado Springs CO USA
| | - William T. Pennington
- Department of Chemistry Clemson University 219 Hunter Laboratories 29634 Clemson SC USA
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5
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Ríos P, Rodríguez A, Conejero S. Enhancing the catalytic properties of well-defined electrophilic platinum complexes. Chem Commun (Camb) 2020; 56:5333-5349. [PMID: 32373864 DOI: 10.1039/d0cc01438a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Platinum complexes have been often considered as the least reactive of the group 10 triad metals. Slow kinetics are behind this lack of reactivity but, still, some industrially relevant catalytic process are dominated by platinum compounds and sometimes different selectivities can be found in comparison to Ni or Pd. Nevertheless, during the last years, it has been reported that the catalytic behaviour of well-defined platinum derivatives can be improved through a judicious choice of their electronic and steric properties, leading to highly electrophilic or low-electron count platinum systems. In this feature article, we highlight some catalytic processes in which well-defined electrophilic platinum complexes or coordinatively unsaturated systems play an important role in their catalytic activity.
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Affiliation(s)
- Pablo Ríos
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, Centro de Innovación en Química Avanzada (ORFEO-CINQA), CSIC/Universidad de Sevilla, C/Américo Vespucio 49, 41092 Sevilla, Spain.
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6
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Price JS, Emslie DJH. Interconversion and reactivity of manganese silyl, silylene, and silene complexes. Chem Sci 2019; 10:10853-10869. [PMID: 32206252 PMCID: PMC7069235 DOI: 10.1039/c9sc04513a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Accepted: 10/23/2019] [Indexed: 01/10/2023] Open
Abstract
Interconversions between manganese silylene and silene complexes are reported, including those involving the first spectroscopically observed silene complexes with an SiH substituent, and their involvement in ethylene hydrosilylation is discussed.
Manganese disilyl hydride complexes [(dmpe)2MnH(SiH2R)2] (4Ph: R = Ph, 4Bu: R = nBu) reacted with ethylene to form silene hydride complexes [(dmpe)2MnH(RHSi
Created by potrace 1.16, written by Peter Selinger 2001-2019
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CHMe)] (6Ph,H: R = Ph, 6Bu,H: R = nBu). Compounds 6R,H reacted with a second equivalent of ethylene to generate [(dmpe)2MnH(REtSi
Created by potrace 1.16, written by Peter Selinger 2001-2019
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CHMe)] (6Ph,Et: R = Ph, 6Bu,Et: R = nBu), resulting from apparent ethylene insertion into the silene Si–H bond. Furthermore, in the absence of ethylene, silene complex 6Bu,H slowly isomerized to the silylene hydride complex [(dmpe)2MnH(
Created by potrace 1.16, written by Peter Selinger 2001-2019
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SiEtnBu)] (3Bu,Et). Reactions of 4R with ethylene likely proceed via low-coordinate silyl {[(dmpe)2Mn(SiH2R)] (2Ph: R = Ph, 2Bu: R = nBu)} or silylene hydride {[(dmpe)2MnH(
Created by potrace 1.16, written by Peter Selinger 2001-2019
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SiHR)] (3Ph,H: R = Ph, 3Bu,H: R = nBu)} intermediates accessed from 4R by H3SiR elimination. DFT calculations and high temperature NMR spectra support the accessibility of these intermediates, and reactions of 4R with isonitriles or N-heterocyclic carbenes yielded the silyl isonitrile complexes [(dmpe)2Mn(SiH2R)(CNR′)] (7a–d: R = Ph or nBu; R′ = o-xylyl or tBu), and NHC-stabilized silylene hydride complexes [(dmpe)2MnH{
Created by potrace 1.16, written by Peter Selinger 2001-2019
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SiHR(NHC)}] (8a–d: R = Ph or nBu; NHC = 1,3-diisopropylimidazolin-2-ylidene or 1,3,4,5-tetramethyl-4-imidazolin-2-ylidene), respectively, all of which were crystallographically characterized. Silyl, silylene and silene complexes in this work were accessed via reactions of [(dmpe)2MnH(C2H4)] (1) with hydrosilanes, in some cases followed by ethylene. Therefore, ethylene (C2H4 and C2D4) hydrosilylation was investigated using [(dmpe)2MnH(C2H4)] (1) as a pre-catalyst, resulting in stepwise conversion of primary to secondary to tertiary hydrosilanes. Various catalytically active manganese-containing species were observed during catalysis, including silylene and silene complexes, and a catalytic cycle is proposed.
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Affiliation(s)
- Jeffrey S Price
- Department of Chemistry , McMaster University , 1280 Main Street West , Hamilton , Ontario L8S 4M1 , Canada .
| | - David J H Emslie
- Department of Chemistry , McMaster University , 1280 Main Street West , Hamilton , Ontario L8S 4M1 , Canada .
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7
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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
4
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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8
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Ortega-Moreno L, Peloso R, López-Serrano J, Iglesias-Sigüenza J, Maya C, Carmona E. A Cationic Unsaturated Platinum(II) Complex that Promotes the Tautomerization of Acetylene to Vinylidene. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Laura Ortega-Moreno
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Riccardo Peloso
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Joaquín López-Serrano
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Javier Iglesias-Sigüenza
- Departamento de Química Orgánica; Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA); C/Prof. García González 1 41012 Sevilla Spain
| | - Celia Maya
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
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9
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Ortega-Moreno L, Peloso R, López-Serrano J, Iglesias-Sigüenza J, Maya C, Carmona E. A Cationic Unsaturated Platinum(II) Complex that Promotes the Tautomerization of Acetylene to Vinylidene. Angew Chem Int Ed Engl 2017; 56:2772-2775. [DOI: 10.1002/anie.201700087] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Laura Ortega-Moreno
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Riccardo Peloso
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Joaquín López-Serrano
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Javier Iglesias-Sigüenza
- Departamento de Química Orgánica; Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA); C/Prof. García González 1 41012 Sevilla Spain
| | - Celia Maya
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC); Avenida Américo Vespucio 49 41092 Sevilla Spain
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10
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Organophosphines in organoplatinum complexes: Structural aspects of PtP2CX (X = NL or BL)derivatives. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.04.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Organophosphines in organoplatinum complexes structural aspects of PtPC3 and PtP2CX (X = H, F or OL) derivatives. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.03.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Abstract
Transition metal hydride complexes are usually amphoteric, not only acting as hydride donors, but also as Brønsted-Lowry acids. A simple additive ligand acidity constant equation (LAC for short) allows the estimation of the acid dissociation constant Ka(LAC) of diamagnetic transition metal hydride and dihydrogen complexes. It is remarkably successful in systematizing diverse reports of over 450 reactions of acids with metal complexes and bases with metal hydrides and dihydrogen complexes, including catalytic cycles where these reactions are proposed or observed. There are links between pKa(LAC) and pKa(THF), pKa(DCM), pKa(MeCN) for neutral and cationic acids. For the groups from chromium to nickel, tables are provided that order the acidity of metal hydride and dihydrogen complexes from most acidic (pKa(LAC) -18) to least acidic (pKa(LAC) 50). Figures are constructed showing metal acids above the solvent pKa scales and organic acids below to summarize a large amount of information. Acid-base features are analyzed for catalysts from chromium to gold for ionic hydrogenations, bifunctional catalysts for hydrogen oxidation and evolution electrocatalysis, H/D exchange, olefin hydrogenation and isomerization, hydrogenation of ketones, aldehydes, imines, and carbon dioxide, hydrogenases and their model complexes, and palladium catalysts with hydride intermediates.
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Affiliation(s)
- Robert H Morris
- Department of Chemistry, University of Toronto , 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada
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13
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Simler T, Braunstein P, Danopoulos AA. Cobalt PNCNHC ‘pincers’: ligand dearomatisation, formation of dinuclear and N2 complexes and promotion of C–H activation. Chem Commun (Camb) 2016; 52:2717-20. [DOI: 10.1039/c5cc10121b] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Ligand dearomatisation in CoII phosphino-picoline NHC-type pincers and dicobalt complexes result from side-arm metalation or C–H activation at the NHC backbone; in the latter case, an ‘anionic dicarbene’ originates from a dearomatised CoI–N2 complex.
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Affiliation(s)
- Thomas Simler
- Laboratoire de Chimie de Coordination
- Institut de Chimie (UMR 7177 CNRS)
- Université de Strasbourg
- 67081 Strasbourg Cedex
- France
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination
- Institut de Chimie (UMR 7177 CNRS)
- Université de Strasbourg
- 67081 Strasbourg Cedex
- France
| | - Andreas A. Danopoulos
- Laboratoire de Chimie de Coordination
- Institut de Chimie (UMR 7177 CNRS)
- Université de Strasbourg
- 67081 Strasbourg Cedex
- France
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14
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Brisdon AK, Ali Ghaba H, Beutel B, Ejgandi A, Egjandi A, Addaraidi A, Pritchard RG. Perfluoropropenyl-containing phosphines from HFC replacements. Dalton Trans 2015. [PMID: 26212860 DOI: 10.1039/c5dt02043c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of new perfluoropropenyl-containing phosphines of the type R3-nP(E-CF[double bond, length as m-dash]CFCF3)n (R = Ph, iPr, n = 1, 2; R = tBu, n = 2) have been prepared from the reaction of the hydrofluoroolefin Z-CF3CF[double bond, length as m-dash]CFH (HFO-1225ye) with base and the appropriate chlorophosphine, while reaction with Cl2PCH2CH2PCl2 gave (CF3CF[double bond, length as m-dash]CF)2PCH2CH2P(CF[double bond, length as m-dash]CFCF3)2, the first example of a bidentate perfluoroalkenyl-containing phosphine. An alternative route to these phosphines based on the room- or low-temperature deprotonation of CF3CF2CH2F (HFC-236ea) gives mainly the E-isomer, but also a small amount of the Z-isomer, the ratio of which depends on the reaction temperature. All of the phosphines could be readily oxidised with either H2O2 or urea·H2O2, and the phosphine selenides R3-nP(Se)(E-CF[double bond, length as m-dash]CFCF3)n (R = Ph, n = 1,2; R = iPr, n = 1; R = tBu, n = 2) were also prepared. The steric and electronic properties of these ligands were determined based on their platinum(ii), palladium(ii) and molybdenum carbonyl complexes. The crystal structures of (CF3CF[double bond, length as m-dash]CF)2PCH2CH2P(CF[double bond, length as m-dash]CFCF3)2, (CF3CF[double bond, length as m-dash]CF)2P(O)CH2CH2P(O)(CF[double bond, length as m-dash]CFCF3)2, iPr2P(Se)(CF[double bond, length as m-dash]CFCF3)2, trans-[PtCl2{Ph(3-n)P(E-CF[double bond, length as m-dash]CFCF3)n}2] (n = 1 or 2), trans-[PdCl2{R2P(E-CF[double bond, length as m-dash]CFCF3)}2] (R = Ph, iPr) and [Mo(CO)4{(CF3CF[double bond, length as m-dash]CF)2PCH2CH2P(CF[double bond, length as m-dash]CFCF3)2}] are reported.
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Affiliation(s)
- Alan K Brisdon
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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15
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Plikhta A, Pöthig A, Herdtweck E, Rieger B. Toward New Organometallic Architectures: Synthesis of Carbene-Centered Rhodium and Palladium Bisphosphine Complexes. Stability and Reactivity of [PCBImPRh(L)][PF6] Pincers. Inorg Chem 2015; 54:9517-28. [DOI: 10.1021/acs.inorgchem.5b01428] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andriy Plikhta
- WACKER-Lehrstuhl für Makromolekulare Chemie & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching b. München, Germany
| | - Alexander Pöthig
- WACKER-Lehrstuhl für Makromolekulare Chemie & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching b. München, Germany
| | - Eberhardt Herdtweck
- WACKER-Lehrstuhl für Makromolekulare Chemie & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching b. München, Germany
| | - Bernhard Rieger
- WACKER-Lehrstuhl für Makromolekulare Chemie & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching b. München, Germany
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16
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McKay D, Riddlestone IM, Macgregor SA, Mahon MF, Whittlesey MK. Mechanistic Study of Ru-NHC-Catalyzed Hydrodefluorination of Fluoropyridines: The Influence of the NHC on the Regioselectivity of C–F Activation and Chemoselectivity of C–F versus C–H Bond Cleavage. ACS Catal 2015. [DOI: 10.1021/cs501644r] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- David McKay
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Ian M. Riddlestone
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Stuart A. Macgregor
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Mary F. Mahon
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
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17
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Mancano G, Page MJ, Bhadbhade M, Messerle BA. Hemilabile and Bimetallic Coordination in Rh and Ir Complexes of NCN Pincer Ligands. Inorg Chem 2014; 53:10159-70. [DOI: 10.1021/ic501158x] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giulia Mancano
- School of Chemistry and ‡Mark Wainwright
Analytical Centre, The University of New South Wales, Kensington, Sydney, NSW 2052, Australia
| | - Michael J. Page
- School of Chemistry and ‡Mark Wainwright
Analytical Centre, The University of New South Wales, Kensington, Sydney, NSW 2052, Australia
| | - Mohan Bhadbhade
- School of Chemistry and ‡Mark Wainwright
Analytical Centre, The University of New South Wales, Kensington, Sydney, NSW 2052, Australia
| | - Barbara A. Messerle
- School of Chemistry and ‡Mark Wainwright
Analytical Centre, The University of New South Wales, Kensington, Sydney, NSW 2052, Australia
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18
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Procacci B, Blagg R, Perutz RN, Rendón N, Whitwood AC. Photochemical Reactions of Fluorinated Pyridines at Half-Sandwich Rhodium Complexes: Competing Pathways of Reaction. Organometallics 2014; 33:45-52. [PMID: 24563575 PMCID: PMC3929166 DOI: 10.1021/om400552r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Indexed: 11/29/2022]
Abstract
Irradiation of CpRh(PMe3)(C2H4) (1; Cp = η5-C5H5) in the presence of pentafluoropyridine in hexane solution at low temperature yields an isolable η2-C,C-coordinated pentafluoropyridine complex, CpRh(PMe3)(η2-C,C-C5NF4) (2). The molecular structure of 2 was determined by single-crystal X-ray diffraction, showing coordination by C3-C4, unlike previous structures of pentafluoropyridine complexes that show N-coordination. Corresponding experiments with 2,3,5,6-tetrafluoropyridine yield the C-H oxidative addition product CpRh(PMe3)(C5NF4)H (3). In contrast, UV irradiation of 1 in hexane, in the presence of 4-substituted tetrafluoropyridines C5NF4X, where X = NMe2, OMe, results in elimination of C2H4 and HF to form the metallacycles CpRh(PMe3)(κ2-C,C-CH2N(CH3)C5NF3) (4) and CpRh(PMe3)(κ2-C,C-CH2OC5NF3) (5), respectively. The X-ray structure of 4 shows a planar RhCCNC-five-membered ring. Complexes 2-5 may also be formed by thermal reaction of CpRh(PMe3)(Ph)H with the respective pyridines at 50 °C.
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Affiliation(s)
- Barbara Procacci
- Department
of Chemistry, University of York, York, U.K. YO10 5DD
| | | | - Robin N. Perutz
- Department
of Chemistry, University of York, York, U.K. YO10 5DD
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Gruver BC, Adams JJ, Arulsamy N, Roddick DM. Acceptor Pincer Chemistry of Osmium: Catalytic Alkane Dehydrogenation by (CF3PCP)Os(cod)(H). Organometallics 2013. [DOI: 10.1021/om400823s] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Brian C. Gruver
- Department of Chemistry, University of Wyoming, Dept. 3838, 1000 E. University Avenue, Laramie, Wyoming 82071, United States
| | - Jeramie J. Adams
- Department of Chemistry, University of Wyoming, Dept. 3838, 1000 E. University Avenue, Laramie, Wyoming 82071, United States
| | - Navamoney Arulsamy
- Department of Chemistry, University of Wyoming, Dept. 3838, 1000 E. University Avenue, Laramie, Wyoming 82071, United States
| | - Dean M. Roddick
- Department of Chemistry, University of Wyoming, Dept. 3838, 1000 E. University Avenue, Laramie, Wyoming 82071, United States
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20
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21
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Carmichael D, le Goff XF, Muller E, Ricard L, Stankevič M. Diastereoselective synthesis and coordination chemistry of enantiopure keto-bis-(2-phosphametallocene)s. Dalton Trans 2012; 41:5155-62. [PMID: 22395340 DOI: 10.1039/c2dt11647b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enantiopure 2-(chlorocarbonyl)phosphametallocenes [MCp*(2-{COCl}-3,4-Me(2)-5-Ph-PC(4))] (M = Fe, Ru) react with phospholide anions to give 2-phosphametallocene-2'-acylphospholides K[MCp*(2-CO-2'-{3',4'-Me(2)-5'-PhPC(4)}-3,4-Me(2)-5-Ph-PC(4))] (M = Fe, Ru) and these have been converted into keto-bis-(2-phosphametallocene)s through reaction with [FeClCp*(tmeda)]; templation of this process with CuBr gives rise to the C(2)- (or pseudo-C(2)- when M = Ru) symmetric form of [{MCp*(3,4-Me(2)-5-Ph-PC(4))}(2)-2,2'-(CO)] (M = Fe, Ru; Fe, Fe) with high (>95%) diastereoselectivity. X-Ray structures of these ligands coordinated to [RuCp*Cl] and [PtCl(2)] centres show that the spatial orientation of the very flexible keto-bis-(2-phosphametallocene) structure is highly responsive to the coordination sphere of the chelated platinum or ruthenium centre.
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Affiliation(s)
- Duncan Carmichael
- Laboratoire Hétéroéléments et Coordination Ecole Polytechnique, CNRS, 91128, Palaiseau cedex, France.
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22
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Reitsamer C, Stallinger S, Schuh W, Kopacka H, Wurst K, Obendorf D, Peringer P. Novel access to carbodiphosphoranes in the coordination sphere of group 10 metals: template synthesis and protonation of PCP pincer carbodiphosphorane complexes of C(dppm)2. Dalton Trans 2012; 41:3503-14. [PMID: 22322243 DOI: 10.1039/c2dt11949h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a novel template synthesis of carbodiphosphoranes (CDPs), the phosphine functionalized CDP ligand C(dppm)(2) (dppm = Ph(2)PCH(2)PPh(2)) is formed in the coordination sphere of group 10 metals from CS(2) and 4 equivalents of dppm. The products are the PCP pincer complexes [M(Cl)(C(dppm)(2)-κ3P,C,P)]Cl (M = Ni, Pd, Pt) and 2 equivalents of dppmS. The compound C(dppm)(2), which is composed of a divalent carbon atom and two dppm subunits, represents a new PCP-type pincer ligand with the formally neutral carbon Lewis base of the CDP functionality as the central carbon. Treatment of [M(Cl)(C(dppm)(2)-κ3P,C,P)]Cl (M = Pd, Pt) with hydrochloric acid results in protonation at the CDP carbon atom and the formation of the PCP pincer complexes [M(Cl)(CH(dppm)(2)-κ3P,C,P)]Cl(2) (M = Pd, Pt). The PCP pincer ligand [CH(dppm)(2)](+) involves a formally cationic central carbon donor. The reaction of [Ni(Cl)(C(dppm)(2)-κ3P,C,P)]Cl with HCl leads to the extrusion of NiCl(2) and formation of the diprotonated CDP compound [CH(2)(dppm)(2)]Cl(2), from which the monoprotonated conjugate base [CH(dppm)(2)]Cl is obtained upon addition of bases, such as NH(3). The crystal structures of [M(Cl)(C(dppm)(2)-κ3P,C,P)]Cl (M = Ni, Pd, Pt), [Ni(Cl)(C(dppm)(2)-κ3P,C,P)](2)[NiCl(4)], [M(Cl)(CH(dppm)(2)-κ3P,C,P)]Cl(2) (M = Pd, Pt) as well as [CH(2)(dppm)(2)]Cl(2) and [CH(dppm)(2)]Cl are presented. A comparison of the solid state structures reveals interesting features, e.g. infinite supramolecular networks mediated by C-H···Cl hydrogen bond interactions and an unexpected loss of molecular symmetry upon protonation in the complexes [M(CH(dppm)(2)-κ3P,C,P)(Cl)]Cl(2) (M = Pd, Pt) as a result of the flexible ligand backbone. Additionally the new compounds were characterized comprehensively in solution by multinuclear (31)P, (13)C and (1)H NMR spectroscopy: Several spectroscopic parameters show a striking variability in particular regarding the carbodiphosphorane functionality. Furthermore the compound [Ni(Cl)(C(dppm)(2)-κ3P,C,P)]Cl was examined by cyclic voltammetry (CV) and could be shown to display quasi-reversible oxidative as well as reductive behaviour.
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Affiliation(s)
- Christian Reitsamer
- Institut für Allgemeine, Anorganische und Theoretische Chemie der Universität Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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23
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Arunachalampillai A, Loganathan N, Wendt OF. Carboxylation of pincer PCP platinum methoxide complexes under formation of metalla carbonates. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.08.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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24
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Rajeev R, Sunoj RB. Mechanistic insights on platinum- and palladium-pincer catalyzed coupling and cyclopropanation reactions between olefins. Dalton Trans 2012; 41:8430-40. [DOI: 10.1039/c2dt12325h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Affiliation(s)
- Margarita Crespo
- Departament de Quimica
Inorgànica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona,
Spain
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26
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Buergler JF, Togni A. Secondary Ferrocenyl Phosphines: Versatile Precursors for the Synthesis of Bi- and Tridentate Ligands. Organometallics 2011. [DOI: 10.1021/om200574k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jonas F. Buergler
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Antonio Togni
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
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27
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Spasyuk DM, Gorelsky SI, van der Est A, Zargarian D. Characterization of divalent and trivalent species generated in the chemical and electrochemical oxidation of a dimeric pincer complex of nickel. Inorg Chem 2011; 50:2661-74. [PMID: 21322580 DOI: 10.1021/ic1025894] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The electrolytic and chemical oxidation of the dimeric pincer complex [κ(P),κ(C),κ(N),μ(N)-(2,6-(i-Pr(2)POC(6)H(3)CH(2)NBn)Ni](2) (1; Bn = CH(2)Ph) has been investigated by various analytic techniques. Cyclic voltammetry measurements have shown that 1 undergoes a quasi-reversible, one electron, Ni-based redox process (ΔE(0)(1/2) = -0.07 V vs Cp(2)Fe/[Cp(2)Fe](+)), and spectroelectrochemical measurements conducted on the product of the electrolytic oxidation, [1](+•), have shown multiple low-energy electronic transitions in the range of 10,000-15,000 cm(-1). Computational studies using Density Functional Theory (B3LYP) have corroborated the experimentally obtained structure of 1, provided the electronic structure description, and helped interpret the experimentally obtained absorption spectra for 1 and [1](+·). These calculations indicate that the radical cation [1](+·) is a dimeric, mixed-valent species (class III) wherein most of the spin density is delocalized over the two nickel centers (Ni(+2.5)(2)N(2)), but some spin density is also present over the two nitrogen atoms (Ni(2+)(2)N(2)·). Examination of alternative structures for open shell species generated from 1 has shown that the spin density distribution is highly sensitive toward changes in the ligand environment of the Ni ions. NMR, UV-vis, electron paramagnetic resonance (EPR), and single crystal X-ray diffraction analyses have shown that chemical oxidation of 1 with N-Bromosuccinimide (NBS) follows a complex process that gives multiple products, including the monomeric trivalent species κ(P),κ(C),κ(N)-{2,6-(i-Pr(2)PO)(C(6)H(3))(CH═NBn)}NiBr(2) (2). These studies also indicate that oxidation of 1 with 1 equiv of NBS gives an unstable, paramagnetic intermediate that decomposes to a number of divalent species, including succinimide and the monomeric divalent complexes κ(P),κ(C),κ(N)-{2,6-(i-Pr(2)PO)(C(6)H(3))(CH═NBn)}NiBr (3) and κ(P),κ(C),κ(N)-{2,6-(i-Pr(2)PO)(C(6)H(3))(CH(2)N(H)Bn)}NiBr(2) (4); a second equivalent of NBS then oxidizes 3 and 4 to 2 and other unidentified products. The divalent complex 3 was synthesized independently and shown to react with NBS or bromine to form its trivalent homologue 2. The new complexes 2 and 3 have been characterized fully.
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Affiliation(s)
- Denis M Spasyuk
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
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28
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Adams JJ, Arulsamy N, Roddick DM. Acceptor PCP Pincer Iridium(I) Chemistry: Stabilization of Nonmeridional PCP Coordination Geometries. Organometallics 2011. [DOI: 10.1021/om100864g] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jeramie J. Adams
- Department of Chemistry, Box 3838, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Navamoney Arulsamy
- Department of Chemistry, Box 3838, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Dean M. Roddick
- Department of Chemistry, Box 3838, University of Wyoming, Laramie, Wyoming 82071, United States
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29
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Putzien S, Nuyken O, Kühn FE. Functionalized polysilalkylene siloxanes (polycarbosiloxanes) by hydrosilylation—Catalysis and synthesis. Prog Polym Sci 2010. [DOI: 10.1016/j.progpolymsci.2010.01.007] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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30
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Armanino N, Koller R, Togni A. Electrophilic Trifluoromethylation of Primary Phosphines: Synthesis of a P-Bis(trifluoromethyl) Derivative of BINAP. Organometallics 2010. [DOI: 10.1021/om100015s] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicolas Armanino
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Raffael Koller
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Antonio Togni
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
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31
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Hu J, Xu H, Nguyen MH, Yip JHK. Photooxidation of a platinum-anthracene pincer complex: formation and structures of Pt(II)-anthrone and -ketal complexes. Inorg Chem 2010; 48:9684-92. [PMID: 19817495 DOI: 10.1021/ic900479w] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Irradiating the cyclometalated pincer complex Pt(II)(DPA)Cl (1, DPA = 1,8-bis(diphenylphosphino)anthracene) in the presence of O(2) led to three sequential oxidations of the anthracenyl ring. The first photoproduct, a Pt(II)-9,10-endoperoxide complex, was converted photochemically to a Pt(II)-9-hydroxyanthrone complex A which was further oxygenated to a Pt(II)-hemiketal (B). The oxidation of A, which could be accelerated by light irradiation, probably involved a Pt(II)-anthraquinone intermediate. B underwent acid-catalyzed ketalization to form a binuclear Pt(II)(2)-diketal (B1). The photolysis was followed by UV-vis absorption and NMR spectroscopy, and the structures of A and B1 were characterized by single crystal X-ray diffraction.
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Affiliation(s)
- Jian Hu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 11754
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32
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Plutino MR, Fenech L, Stoccoro S, Rizzato S, Castellano C, Albinati A. Dynamic NMR Study of Ethene Exchange in Cationic CNN-Type Platinum(II) Complexes. Inorg Chem 2009; 49:407-18. [DOI: 10.1021/ic901078u] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- M. Rosaria Plutino
- Istituto per lo Studio dei Materiali Nanostrutturati, ISMN−CNR, Unità di Messina-Sezione di Palermo, Messina, Italy
| | - Lucia Fenech
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Università di Messina, Salita Sperone 31, 98166 Vill. S. Agata, Messina, Italy
| | - Sergio Stoccoro
- Dipartimento di Chimica, Università di Sassari, via Vienna 2, 07100, Sassari, Italy
| | - Silvia Rizzato
- Dipartimento di Chimica Strutturale e Facoltà di Farmacia, via Venezian 21, Università di Milano, 20133, Milano, Italy
| | - Carlo Castellano
- Dipartimento di Chimica Strutturale e Facoltà di Farmacia, via Venezian 21, Università di Milano, 20133, Milano, Italy
| | - Alberto Albinati
- Dipartimento di Chimica Strutturale e Facoltà di Farmacia, via Venezian 21, Università di Milano, 20133, Milano, Italy
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