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Ziółkowska A, Witwicki M. Understanding the Exchange Interaction between Paramagnetic Metal Ions and Radical Ligands: DFT and Ab Initio Study on Semiquinonato Cu(II) Complexes. Int J Mol Sci 2023; 24:ijms24044001. [PMID: 36835412 PMCID: PMC9959031 DOI: 10.3390/ijms24044001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023] Open
Abstract
The exchange coupling, represented by the J parameter, is of tremendous importance in understanding the reactivity and magnetic behavior of open-shell molecular systems. In the past, it was the subject of theoretical investigations, but these studies are mostly limited to the interaction between metallic centers. The exchange coupling between paramagnetic metal ions and radical ligands has hitherto received scant attention in theoretical studies, and thus the understanding of the factors governing this interaction is lacking. In this paper, we use DFT, CASSCF, CASSCF/NEVPT2, and DDCI3 methods to provide insight into exchange interaction in semiquinonato copper(II) complexes. Our primary objective is to identify structural features that affect this magnetic interaction. We demonstrate that the magnetic character of Cu(II)-semiquinone complexes are mainly determined by the relative position of the semiquinone ligand to the Cu(II) ion. The results can support the experimental interpretation of magnetic data for similar systems and can be used for the in-silico design of magnetic complexes with radical ligands.
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Affiliation(s)
- Aleksandra Ziółkowska
- Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Maciej Witwicki
- Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14, 50-283 Wroclaw, Poland
- Correspondence:
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2
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Redox-active ligands for chemical, electrochemical, and photochemical molecular conversions. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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Liu J, Lorraine SC, Dolinar BS, Hoover JM. Aerobic Oxidation Reactivity of Well-Defined Cobalt(II) and Cobalt(III) Aminophenol Complexes. Inorg Chem 2022; 61:6008-6016. [PMID: 35414172 PMCID: PMC9328405 DOI: 10.1021/acs.inorgchem.1c03686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This paper describes the synthesis and reactivity studies of three cobalt complexes bearing aminophenol-derived ligands without nitrogen substitution: CoII(tBu2APH)2(tBu2AP)2 (1), CoIII2(tBu2APH)2(tBu2AP)2(μ-tBu2BAP)2 (2), and CoIII(tBu2AP)3 (3), where tBu2APH = 2-amino-4,6-di-tert-butylphenol, tBu2AP = 2-amino-4,6-di-tert-butylphenolate, and μ-tBu2BAP = bridging 2-amido-4,6-di-tert-butylphenolate. Stoichiometric reactivity studies of these well-defined complexes demonstrate the catalytic competency of both cobalt(II) and cobalt(III) complexes in the aerobic oxidative cyclization of tBu2APH with tert-butylisonitrile. Reactions with O2 reveal the aerobic oxidation of the cobalt(II) complex 1 to generate the cobalt(III) species 2 and 3. UV-visible time-course studies and electron paramagnetic resonance spectroscopy indicate that this oxidation proceeds through a ligand-based radical intermediate. These studies represent the first example of well-defined cobalt aminophenol complexes that participate in catalytic aerobic oxidation reactions and highlight a key role for a ligand radical in the oxidation sequence.
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Zhang T, Hsieh WY, Daneshvar F, Liu C, Rwei SP, Sue HJ. Copper(I)-alkylamine mediated synthesis of copper nanowires. NANOSCALE 2020; 12:17437-17449. [PMID: 32797131 DOI: 10.1039/d0nr04778c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Formation of a Cu(i)-alkylamine complex is found to be the key step for Cu(ii) ions to reduce to Cu(0) in the presence of glucose. Also, alkylamines in Cu nanowire synthesis serve triple roles as a reducing, complexation and capping agent. Alkylamines reduce Cu(ii) to Cu(i) at above 100 °C and protect the Cu(i) by forming a Cu ion-alkylamine coordination complex with a 1 : 2 ratio in an aqueous solution. With respect to the 1 : 2 complex ratio, the additional free alkylamines ensure a stable Cu(i)-alkylamine complex. After completion of Cu(i)-Cu(0) reduction by glucose, alkylamines remain on Cu(0) seeds to regulate the anisotropic growth of Cu nanocrystals. Long-chain (≥C16) alkylamines are found to help produce high-quality Cu nanowires, while short-chain (≤C12) alkylamines only produce CuO products. Furthermore, Cu nanowire synthesis is found to be sensitive to additional chemicals as they may destabilize Cu ion-alkylamine complexes. By comparing the Cu(i)-alkylamine and Maillard reaction mediated mechanism, the complete Cu nanowire synthesis process using glucose is revealed.
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Affiliation(s)
- Tan Zhang
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
| | - Wen-Yi Hsieh
- Department of Molecular Science and Engineering, Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Farhad Daneshvar
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
| | - Cong Liu
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
| | - Syang-Peng Rwei
- Department of Molecular Science and Engineering, Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Hung-Jue Sue
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
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5
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Nikolaevskaya E, Druzhkov N, Syroeshkin M, Egorov M. Chemistry of diazadiene type ligands with extra coordination groups. Prospects of reactivity. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213353] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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6
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Smolyaninov IV, Poddel’sky AI, Smolyaninova SA, Arsenyev MV, Fukin GK, Berberova NT. Polyfunctional Sterically Hindered Catechols with Additional Phenolic Group and Their Triphenylantimony(V) Catecholates: Synthesis, Structure, and Redox Properties. Molecules 2020; 25:molecules25081770. [PMID: 32290617 PMCID: PMC7221534 DOI: 10.3390/molecules25081770] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/09/2020] [Accepted: 04/10/2020] [Indexed: 01/25/2023] Open
Abstract
New polyfunctional sterically hindered 3,5-di-tert-butylcatechols with an additional phenolic group in the sixth position connected by a bridging sulfur atom—(6-(CH2-S-tBu2Phenol)-3,5-DBCat)H2 (L1), (6-(S-tBu2Phenol)-3,5-DBCat)H2 (L2), and (6-(S-Phenol)-3,5-DBCat)H2 (L3) (3,5-DBCat is dianion 3,5-di-tert-butylcatecolate)—were synthesized and characterized in detail. The exchange reaction between catechols L1 and L3 with triphenylantimony(V) dibromide in the presence of triethylamine leads to the corresponding triphenylantimony(V) catecholates (6-(CH2-S-tBu2Phenol)-3,5-DBCat)SbPh3 (1) and (6-(S-Phenol)-3,5-DBCat)SbPh3 (2). The electrochemical properties of catechols L1–L3 and catecholates 1 and 2 were investigated using cyclic voltammetry. The electrochemical oxidation of L1–L3 at the first stage proceeds with the formation of the corresponding o-benzoquinones. The second process is the oxidation of the phenolic moiety. Complexes 1 and 2 significantly expand their redox capabilities, owing to the fact that they can act as the electron donors due to the catecholate metallocycle capable of sequential oxidations, and as donors of the hydrogen atoms, thus forming a stable phenoxyl radical. The molecular structures of the free ligand L1 and complex 1 in the crystal state were determined by single-crystal X-ray analysis.
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Affiliation(s)
- Ivan V. Smolyaninov
- Toxicology Research Group, Federal State Budgetary Institution of Science “Federal Research Centre The Southern Scientific Centre of the Russian Academy of The Sciences”, Tatischeva str. 16, 414056 Astrakhan, Russia;
- Department of Chemistry, Astrakhan State Technical University, 16 Tatisheva str., Astrakhan 414056, Russia; (S.A.S.); (N.T.B.)
| | - Andrey I. Poddel’sky
- G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina str., 603137 Nizhny Novgorod, Russia; (M.V.A.); (G.K.F.)
- Correspondence: ; Tel./Fax: +7-831-462-7497
| | - Susanna A. Smolyaninova
- Department of Chemistry, Astrakhan State Technical University, 16 Tatisheva str., Astrakhan 414056, Russia; (S.A.S.); (N.T.B.)
| | - Maxim V. Arsenyev
- G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina str., 603137 Nizhny Novgorod, Russia; (M.V.A.); (G.K.F.)
| | - Georgy K. Fukin
- G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 Tropinina str., 603137 Nizhny Novgorod, Russia; (M.V.A.); (G.K.F.)
| | - Nadezhda T. Berberova
- Department of Chemistry, Astrakhan State Technical University, 16 Tatisheva str., Astrakhan 414056, Russia; (S.A.S.); (N.T.B.)
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7
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Mondal B, Ye S. Hidden ligand noninnocence: A combined spectroscopic and computational perspective. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213115] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8
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Nikolaevskii SA, Kiskin MA, Starikov AG, Efimov NN, Bogomyakov AS, Minin VV, Ugolkova EA, Nikitin OM, Magdesieva TV, Sidorov AA, Eremenko IL. Atmospheric Oxygen Influence on the Chemical Transformations of 4,5-Dimethyl-1,2-Phenylenediamine in the Reactions with Copper(II) Pivalate. RUSS J COORD CHEM+ 2019. [DOI: 10.1134/s1070328419040067] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Klementyeva SV, Lukoyanov AN, Afonin MY, Mörtel M, Smolentsev AI, Abramov PA, Starikova AA, Khusniyarov MM, Konchenko SN. Europium and ytterbium complexes with o-iminoquinonato ligands: synthesis, structure, and magnetic behavior. Dalton Trans 2019; 48:3338-3348. [PMID: 30778457 DOI: 10.1039/c8dt04849e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complexes of divalent ytterbium (1) and europium (2) with a dianionic o-amidophenolate ligand were prepared by both the direct reduction of 4,6-di-tert-butyl-N-(2,6-diisopropylphenyl)-o-iminobenzoquinone (dpp-IQ) and the salt metathesis reaction of potassium o-amidophenolate with LnI2 (Ln = Yb, Eu). Oxidation of o-amidophenolates 1, 2 with one equivalent of dpp-IQ as well as the salt metathesis reaction of potassium o-iminosemiquinolate with LnI2 afforded ligand mixed-valent o-iminosemiquinonato-amidophenolato complexes of trivalent ytterbium (3) and europium (4). All novel complexes 1-4 were fully characterized, including the solid state structures of 1 and 2 determined by single crystal X-ray diffraction. The magnetic properties of paramagnetic 2-4 were examined.
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Affiliation(s)
- Svetlana V Klementyeva
- Kazan Federal University, A.M. Butlerov Institute of Chemistry, 420008, Kremlevskaya str. 29/1, Kazan, Russia.
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van der Vlugt JI. Radical-Type Reactivity and Catalysis by Single-Electron Transfer to or from Redox-Active Ligands. Chemistry 2019; 25:2651-2662. [PMID: 30084211 PMCID: PMC6471147 DOI: 10.1002/chem.201802606] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 12/12/2022]
Abstract
Controlled ligand-based redox-activity and chemical non-innocence are rapidly gaining importance for selective (catalytic) processes. This Concept aims to provide an overview of the progress regarding ligand-to-substrate single-electron transfer as a relatively new mode of operation to exploit ligand-centered reactivity and catalysis based thereon.
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Affiliation(s)
- Jarl Ivar van der Vlugt
- Bio-Inspired Homogeneous and Supramolecular Catalysis Groupvan ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamNetherlands
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11
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Yang X, Gianetti TL, Wörle MD, van Leest NP, de Bruin B, Grützmacher H. A low-valent dinuclear ruthenium diazadiene complex catalyzes the oxidation of dihydrogen and reversible hydrogenation of quinones. Chem Sci 2019; 10:1117-1125. [PMID: 30774909 PMCID: PMC6346631 DOI: 10.1039/c8sc02864h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 11/01/2018] [Indexed: 12/27/2022] Open
Abstract
The dinuclear ruthenium complex [Ru2H(μ-H)(Me2dad)(dbcot)2] contains a 1,4-dimethyl-diazabuta-1,3-diene (Me2dad) as a non-innocent bridging ligand between the metal centers to give a [Ru2(Me2dad)] core. In addition, each ruthenium is bound to one dibenzo[a,e]cyclooctatetraene (dbcot) ligand. This Ru dimer converts H2 to protons and electrons. It also catalyzes reversibly under mild conditions the selective hydrogenation of vitamins K2 and K3 to their corresponding hydroquinone equivalents without affecting the C[double bond, length as m-dash]C double bonds. Mechanistic studies suggest that the [Ru2(Me2dad)] moiety, like hydrogenases, reacts with H2 and releases electrons and protons stepwise.
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Affiliation(s)
- Xiuxiu Yang
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1 , 8093 Zürich , Switzerland .
| | - Thomas L Gianetti
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1 , 8093 Zürich , Switzerland . .,Department of Chemistry and Biochemistry , The University of Arizona , Tucson , Arizona 85721 , USA .
| | - Michael D Wörle
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1 , 8093 Zürich , Switzerland .
| | - Nicolaas P van Leest
- Van't Hoff Institute for Molecular Sciences (HIMS) , University of Amsterdam (UvA) , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Bas de Bruin
- Van't Hoff Institute for Molecular Sciences (HIMS) , University of Amsterdam (UvA) , Science Park 904 , 1098 XH Amsterdam , The Netherlands
| | - Hansjörg Grützmacher
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1 , 8093 Zürich , Switzerland .
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12
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Zhou C, Li A, Wang D, Pan E, Chen X, Jia M, Song H. MOF-templated self-polymerization of p-phenylenediamine to a polymer with a hollow box-assembled spherical structure. Chem Commun (Camb) 2019; 55:4071-4074. [DOI: 10.1039/c9cc01081e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu–pPD acts as both a structural template and reactant to realize direct conversion from MOFs to polymers in one step.
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Affiliation(s)
- Chunli Zhou
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Ang Li
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Dengke Wang
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Erzhuang Pan
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Xiaohong Chen
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Mengqiu Jia
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Huaihe Song
- State Key Laboratory of Chemical Resource Engineering
- Beijing Key Laboratory of Electrochemical Process and Technology for Materials
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
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Safaei E, Balaghi SE, Chiang L, Clarke RM, Martelino D, Webb MI, Wong EWY, Savard D, Walsby CJ, Storr T. Stabilization of different redox levels of a tridentate benzoxazole amidophenoxide ligand when bound to Co(iii) or V(v). Dalton Trans 2019; 48:13326-13336. [DOI: 10.1039/c9dt02865j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The electronic structure of Co and V complexes of a tridentate benzoxazole-containing aminophenol ligand NNOH2 were characterized by both experimental and theoretical methods.
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Affiliation(s)
- Elham Safaei
- Department of Chemistry
- College of Science
- Shiraz University
- Shiraz
- Iran
| | | | - Linus Chiang
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Ryan M. Clarke
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Diego Martelino
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Michael I. Webb
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Edwin W. Y. Wong
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Didier Savard
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Charles J. Walsby
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
| | - Tim Storr
- Department of Chemistry
- Simon Fraser University
- 8888 University Drive
- Burnaby
- Canada
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14
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Multinuclear compounds of s-elements with sterically hindered о-semiquinonates and catecholates. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2038-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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15
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Pascal S, Siri O. Benzoquinonediimine ligands: Synthesis, coordination chemistry and properties. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.06.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Matsumoto T, Ishii J, Wakizaka M, Chang HC. Structural and Spectroscopic Studies on the Interactions of ortho-Phenylenediamine and Li+, Na+, Mg2+, or Ca2+ Ions. CHEM LETT 2017. [DOI: 10.1246/cl.160997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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The synthesis and structure of new tin(II) complexes based on ferrocenyl-containing o -iminophenols. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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18
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Ciccione J, Leconte N, Luneau D, Philouze C, Thomas F. Geometric and Electronic Structures of Nickel(II) Complexes of Redox Noninnocent Tetradentate Phenylenediamine Ligands. Inorg Chem 2016; 55:649-65. [PMID: 26689346 DOI: 10.1021/acs.inorgchem.5b01947] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Five tetradentate ligands based on the N,N'-bis(2-amino-3,5-di-tert-butylphenyl)-o-phenylenediamine backbone were prepared, with different substituents at positions 4 and 5 (CH3 (3a), p-CH3O-C6H4 (3b), H (3c), Cl (3d), F (3e)). Their reaction with a nickel(II) salt in air affords the neutral species 4(a-e), which were isolated as single crystals. 4(a-e) feature two antiferromagnetically exchange-coupled diiminosemiquinonate moieties, both located on peripheral rings, and a diamidobenzene bridging unit. Oxidation of 4(a-e) with 1 equiv of AgSbF6 yields the cations 4(a-e)(+), which harbor a single diiminosemiquinonate radical. Significant structural differences were observed within the series. 4b(+) is mononuclear and contains a localized diiminosemiquinonate moiety. In contrast, 4c(+) is a dimer wherein the diiminosemiquinonate radical is rather delocalized over both peripheral rings. 4d(+) represents an intermediate case where the complex is mononuclear, but the radical is fully delocalized. Oxidation of 4(a-e) with 2 equiv of AgSbF6 produces the corresponding mononuclear dications. X-ray diffraction data on 4(b-d)(2+) reveals that the bridging ring retains its diamidobenzene character, whereas both peripheral rings have been oxidized into diiminobenzoquinone moieties. All the complexes were characterized by electrochemistry, EPR, and UV-vis-NIR spectroscopy. Remarkably, the electronic structures of the complexes differ from those reported by Wieghardt et al. for copper and zinc complexes of a related ligand involving a mixed N2O2 donor set (J. Am. Chem. Soc. 1999, 121, 9599). The easier oxidation of phenylenediamine moieties in comparison to aminophenols is proposed to account for the difference.
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Affiliation(s)
- Jérémie Ciccione
- Chimie Inorganique Redox, Département de Chimie Moléculaire (UMR CNRS 5250), Université Grenoble Alpes, UMR-5250 , 38041 Grenoble Cedex 9, France
| | - Nicolas Leconte
- Chimie Inorganique Redox, Département de Chimie Moléculaire (UMR CNRS 5250), Université Grenoble Alpes, UMR-5250 , 38041 Grenoble Cedex 9, France
| | - Dominique Luneau
- Laboratoire des Multimatériaux et Interfaces (UMR CNRS 5615), Université Claude Bernard Lyon 1 , 69622 Villeurbanne cedex, France
| | - Christian Philouze
- Chimie Inorganique Redox, Département de Chimie Moléculaire (UMR CNRS 5250), Université Grenoble Alpes, UMR-5250 , 38041 Grenoble Cedex 9, France
| | - Fabrice Thomas
- Chimie Inorganique Redox, Département de Chimie Moléculaire (UMR CNRS 5250), Université Grenoble Alpes, UMR-5250 , 38041 Grenoble Cedex 9, France
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Broere DLJ, Plessius R, van der Vlugt JI. New avenues for ligand-mediated processes--expanding metal reactivity by the use of redox-active catechol, o-aminophenol and o-phenylenediamine ligands. Chem Soc Rev 2015; 44:6886-915. [PMID: 26148803 DOI: 10.1039/c5cs00161g] [Citation(s) in RCA: 329] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Redox-active ligands have evolved from being considered spectroscopic curiosities - creating ambiguity about formal oxidation states in metal complexes - to versatile and useful tools to expand on the reactivity of (transition) metals or to even go beyond what is generally perceived possible. This review focusses on metal complexes containing either catechol, o-aminophenol or o-phenylenediamine type ligands. These ligands have opened up a new area of chemistry for metals across the periodic table. The portfolio of ligand-based reactivity invoked by these redox-active entities will be discussed. This ranges from facilitating oxidative additions upon d(0) metals or cross coupling reactions with cobalt(iii) without metal oxidation state changes - by functioning as an electron reservoir - to intramolecular ligand-to-substrate single-electron transfer to create a reactive substrate-centered radical on a Pd(ii) platform. Although the current state-of-art research primarily consists of stoichiometric and exploratory reactions, several notable reports of catalysis facilitated by the redox-activity of the ligand will also be discussed. In conclusion, redox-active ligands containing catechol, o-aminophenol or o-phenylenediamine moieties show great potential to be exploited as reversible electron reservoirs, donating or accepting electrons to activate substrates and metal centers and to enable new reactivity with both early and late transition as well as main group metals.
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Affiliation(s)
- Daniël L J Broere
- University of Amsterdam, van't Hoff Institute for Molecular Sciences, Homogeneous, Bio-Inspired and Supramolecular Catalysis Group, Science Park 904, Amsterdam, the Netherlands
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Less RJ, Allen LK, Steiner A, Wright DS. Multiple deprotonation of primary aromatic diamines by LiAlH4. Dalton Trans 2015; 44:4141-7. [DOI: 10.1039/c4dt03802a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of LiAlH4with 1,2-phenylenediamine (1H4) in THF gives [{Al(1H2)}2{Al(1H)2}2][Li(THF)2]4, containing the largest aluminate of its type so far reported.
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Zhao P, Wu QH, Liu DS, Chen G. Spin-filtering, giant magnetoresistance, rectifying and negative differential resistance effects in planar four-coordinate Fe complex with graphene nanoribbon electrodes. J Chem Phys 2014; 140:044311. [DOI: 10.1063/1.4862502] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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22
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Shuster V, Gambarotta S, Nikiforov GB, Budzelaar PHM. Heterometallic Aluminum–Chromium Phenazine and Thiophenazine Complexes. Formation of a Tetranuclear Chromium(I) Sandwich Complex. Organometallics 2013. [DOI: 10.1021/om3012097] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimir Shuster
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
| | - Sandro Gambarotta
- Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada
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23
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Kim E, Lee H. Template synthesis and X-ray crystal structures of 15-membered unsymmetric monobenzotetraazaannulene nickel(II) complexes. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.12.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Dunn TJ, Webb MI, Hazin K, Verma P, Wasinger EC, Shimazaki Y, Storr T. Double oxidation localizes spin in a Ni bis-phenoxyl radical complex. Dalton Trans 2013; 42:3950-6. [DOI: 10.1039/c2dt32632a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Huang J, Wang W, Yang S, Su H, Li Q, Yang J. A theoretical study of spin-polarized transport properties of planar four-coordinate Fe complexes. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.05.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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27
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Zhang Y, Luo Y, Tian J, Asiri AM, Al-Youbi AO, Sun X. Rectangular coordination polymer nanoplates: large-scale, rapid synthesis and their application as a fluorescent sensing platform for DNA detection. PLoS One 2012; 7:e30426. [PMID: 22279589 PMCID: PMC3261194 DOI: 10.1371/journal.pone.0030426] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Accepted: 12/16/2011] [Indexed: 12/02/2022] Open
Abstract
In this paper, we report on the large-scale, rapid synthesis of uniform rectangular coordination polymer nanoplates (RCPNs) assembled from Cu(II) and 4,4′-bipyridine for the first time. We further demonstrate that such RCPNs can be used as a very effective fluorescent sensing platform for multiple DNA detection with a detection limit as low as 30 pM and a high selectivity down to single-base mismatch. The DNA detection is accomplished by the following two steps: (1) RCPN binds dye-labeled single-stranded DNA (ssDNA) probe, which brings dye and RCPN into close proximity, leading to fluorescence quenching; (2) Specific hybridization of the probe with its target generates a double-stranded DNA (dsDNA) which detaches from RCPN, leading to fluorescence recovery. It suggests that this sensing system can well discriminate complementary and mismatched DNA sequences. The exact mechanism of fluorescence quenching involved is elucidated experimentally and its use in a human blood serum system is also demonstrated successfully.
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Affiliation(s)
- Yingwei Zhang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin, People's Republic of China
| | - Yonglan Luo
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin, People's Republic of China
| | - Jingqi Tian
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin, People's Republic of China
- Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Abdullah M. Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Abdulrahman O. Al-Youbi
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Xuping Sun
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Changchun, Jilin, People's Republic of China
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
- * E-mail:
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28
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Scepaniak JJ, Wu G, Hayton TW. Complexes of Cu(i) supported by a tris(ketimine) tripod. Dalton Trans 2012; 41:7859-61. [DOI: 10.1039/c2dt30101f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Dunn TJ, Chiang L, Ramogida CF, Webb MI, Savard D, Sakaguchi M, Ogura T, Shimazaki Y, Storr T. Non-innocent ligand behaviour of a bimetallic Cu complex employing a bridging catecholate. Dalton Trans 2012; 41:7905-14. [DOI: 10.1039/c2dt30444a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Dunn TJ, Ramogida CF, Simmonds C, Paterson A, Wong EWY, Chiang L, Shimazaki Y, Storr T. Non-Innocent Ligand Behavior of a Bimetallic Ni Schiff-Base Complex Containing a Bridging Catecholate. Inorg Chem 2011; 50:6746-55. [DOI: 10.1021/ic200785g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Tim J. Dunn
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
| | - Caterina F. Ramogida
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
| | - Curtis Simmonds
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
| | - Alisa Paterson
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
| | - Edwin W. Y. Wong
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
| | - Linus Chiang
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
| | - Yuichi Shimazaki
- College of Science, Ibaraki University, Bunkyo, Mito 310-8512, Japan
| | - Tim Storr
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A-1S6, Canada
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31
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Luo Y, Liao F, Lu W, Chang G, Sun X. Coordination polymer nanobelts for nucleic acid detection. NANOTECHNOLOGY 2011; 22:195502. [PMID: 21430328 DOI: 10.1088/0957-4484/22/19/195502] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Herein, coordination polymer nanobelts (CPNBs) were prepared rapidly and on a large scale, by directly mixing aqueous AgNO(3) solution and an ethanol solution of 4, 4'-bipyridine at room temperature. The application of such CPNBs as a fluorescent sensing platform for nucleic acid detection was further explored. CPNB is a π-rich structure, the strong π-π stacking interactions between unpaired DNA bases and CPNB leads to adsorption of fluorescently labeled single-stranded DNA (ssDNA) accompanied by 66% fluorescence quenching. However, the presence of target ssDNA will hybridize with the probe. The resultant helix cannot be adsorbed by CPNB due to its rigid conformation and the absence of unpaired DNA bases. Thus, a significant fluorescence enhancement, 73% fluorescence recovery, was observed in DNA detection as long as the target exists. The present system has excellent sensitivity; a substantial fluorescence enhancement was observed when the concentration of the target was as low as 5 nM. It also exhibits outstanding discrimination ability down to a single-base mismatch.
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Affiliation(s)
- Yonglan Luo
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, School of Chemistry and Chemical Industry, China West Normal University, Nanchong, Sichuan, People's Republic of China
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32
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Halls JE, Lawrence NS, Wadhawan JD. Electrochemical estimation of diffusion anisotropy of N,N,N',N'-tetramethyl-para-phenylenediamine within the normal hexagonal lyotropic mesophase of Triton X 100/light water: when can the effects of cross-pseudophase electron transfer be neglected for partitioned reagents? J Phys Chem B 2011; 115:6509-23. [PMID: 21534581 DOI: 10.1021/jp201806f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The H(1) lyotropic liquid crystalline phase of Triton X 100 with aqueous 0.1 M potassium chloride is examined as a medium in which to determine the axiosymmetric anisotropy in the diffusion flux of N,N,N',N'-tetramethyl-para-phenylenediamine using electrochemical methods (voltammetry and potential step chronoamperometry) at both planar electrodes and two-dimensional flux microdisk electrodes. Comparison of experiment with theory suggests the ratio of anisotropic diffusion coefficients in the directions tangential and perpendicular to the electrode surface varies over two orders of magnitude (from 0.04 to 3.3) with increasing concentration of the redox analyte. This is understood through the occurrence of a long-range charge transfer across the pseudophase | pseudophase boundary interface, occurring as a result of differential diffusivities of the redox probe within the surfactant and aqueous subphases. These data and their dependence on the analyte concentration empower, in a proof-of-concept, the estimation of the partition equilibrium constant (K(P)); the value estimated for the small electroactive-drug mimetic considered is log K(P) = 2.01 ± 0.05 (at 294 ± 2 K) and is in agreement with that envisaged for its partition between n-octanol and water. It is suggested that only measurements at low analyte loadings allow for interphase electron transfers to be neglected, since then percolation effects appear to dominate the Faradaic current.
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Affiliation(s)
- Jonathan E Halls
- Department of Physical Sciences (CHEMISTRY), The University of Hull, Kingston-upon-Hull, United Kingdom
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33
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Li H, Zhai J, Sun X. Large-scale synthesis of coordination polymer microdendrites and their application as a sensing platform for fluorescent DNA detection. RSC Adv 2011. [DOI: 10.1039/c1ra00359c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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34
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Shimazaki Y, Arai N, Dunn TJ, Yajima T, Tani F, Ramogida CF, Storr T. Influence of the chelate effect on the electronic structure of one-electron oxidized group 10 metal(ii)-(disalicylidene)diamine complexes. Dalton Trans 2011; 40:2469-79. [DOI: 10.1039/c0dt01574a] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Tsui WM, Huang JS, Tong GSM, Kui SC, Che CM, Zhu N. Quinoneimido Complexes of a Metalloporphyrin: Isolation, X-ray Crystal Structures, and DFT Calculations. Chem Asian J 2010; 5:759-63. [DOI: 10.1002/asia.200900666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Khusniyarov MM, Weyhermüller T, Bill E, Wieghardt K. Tuning the oxidation level, the spin state, and the degree of electron delocalization in homo- and heteroleptic bis(alpha-diimine)iron complexes. J Am Chem Soc 2009; 131:1208-21. [PMID: 19105752 DOI: 10.1021/ja808149k] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The four-coordinate heteroleptic complex [Fe(III)((F)pda(2-))((F)dad*-)] (1) and its homoleptic analogue [Fe(II)((F)dad*-)2] (2), where (F)pda(2-) is the closed-shell ligand N,N'-bis(pentafluorophenyl)-o-phenylenediamide(2-) and (F)dad*- is the singly reduced N,N'-bis(pentafluorophenyl)-2,3-dimethyl-1,4-diazabutadiene pi-radical anion, have been synthesized. X-ray crystallographic studies reveal a twisted tetrahedral geometry of the FeN4 coordination polyhedron in both 1 and 2. The electronic structures of 1 and 2 were probed by magnetic susceptibility measurements, 57Fe Mössbauer and electronic spectroscopy, and density functional theory (DFT) calculations. In spite of their similar geometries and a common triplet ground state (S(t) = 1), the electronic structures of 1, 2, and the previously reported homoleptic analogue [Fe(III)((F)pda(2-))((F)pda*-)] (3), where (F)pda*- is a one-electron-oxidized form of (F)pda(2-), differ. The electronic structure of 2 consists of two (F)dad*- radicals coupled antiferromagnetically to a high-spin Fe(II) center, whereas in 3, only one (F)pda*- radical is coupled antiferromagnetically to an intermediate-spin Fe(III) ion. This ligand mixed-valent species exhibits class-III behavior. Heteroleptic 1 contains a single (F)dad*- radical coupled antiferromagnetically to an intermediate-spin Fe(III) center but behaves as a class-II ligand mixed-valent species. The observed diversity in the electronic structures of 1-3 is ascribed to the difference in the redox potentials of the ligands. Analysis of reduced orbital charges and spin densities obtained from DFT calculations also suggests that the electronic structures of 1-3 are best described as either a high-spin Fe(II) ion coordinated to two radical monoanions (2) or as an intermediate-spin Fe(III) ion coordinated to one radical monoanion and one closed-shell dianion (1, 3).
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Affiliation(s)
- Marat M Khusniyarov
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany.
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37
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Poddel'sky AI, Cherkasov VK, Abakumov GA. Transition metal complexes with bulky 4,6-di-tert-butyl-N-aryl(alkyl)-o-iminobenzoquinonato ligands: Structure, EPR and magnetism. Coord Chem Rev 2009. [DOI: 10.1016/j.ccr.2008.02.004] [Citation(s) in RCA: 297] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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38
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Ishikawa T, Saito N, Suda K, Kumamoto T, Nakanishi W, Yamaguchi K, Kawahata M, Ogura Y, T. Suzuki K. Semi-quantitative Approaches to the Coordination Ability of o-Bisguanidinobenzenes with Metal Salts. HETEROCYCLES 2009. [DOI: 10.3987/com-08-s(f)28] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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39
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Kalinina D, Dares C, Kaluarachchi H, Potvin PG, Lever ABP. Spectroscopic, electrochemical, and computational aspects of the charge distribution in Ru(acac)2(R-o-benzoquinonediimine) complexes. Inorg Chem 2008; 47:10110-26. [PMID: 18844345 DOI: 10.1021/ic8014496] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The syntheses and properties are reported for five Ru(acac)2(R-bqdi) species where acac is acetylacetonate, and R-bqdi is the non-innocent ligand ortho-benzoquinonediimine substituted with R = H (1), 4,5-dimethyl (2), 4-Cl (3), or 4-NO2 (4), and N,N''-dimethylsulfonyl (5). Their identities and purities were confirmed by NMR, mass spectra, IR and analytical data. The large degree of metal-to-ligand pi-back-donation was analyzed by spectroscopic (UV/visible, IR, Raman) and electrochemical data, supported by molecular orbital composition computations using density functional theory (DFT), with the polarizable continuum model (PCM) to mimic the presence of solvent, and prediction of electronic spectra using time-dependent DFT methods. Extended charge decomposition analysis (ECDA) and natural population analysis (NPA) both produced a detailed picture of the bonding between the non-innocent bqdi ligand and the metal center, allowing correlations to be drawn between the nature of the R substituents and the quantitative extent of pi-back-donation and sigma-forward donation. In conclusion, the issue of whether these species are best regarded as Ru(II)(quinonediimine) or coupled Ru(III)(semiquinonediiminate) species is discussed.
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Affiliation(s)
- Daria Kalinina
- Department of Chemistry, CB124, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3
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40
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Pisarevskaya EY, Alpatova NM. Palladium deposition features on poly-o-phenylenediamine film. RUSS J ELECTROCHEM+ 2008. [DOI: 10.1134/s1023193508080132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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41
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Poddel'sky AI, Smolyaninov IV, Skatova AA, Lukoyanov AN, Fukin GK, Berberova NT, Cherkasov VK, Abakumov GA. Diradical Bis-o-iminosemiquinonato Zinc Complex: Spectroscopy, Magneto- and Electrochemistry. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200700596] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Khusniyarov MM, Harms K, Burghaus O, Sundermeyer J, Sarkar B, Kaim W, van Slageren J, Duboc C, Fiedler J. A series of metal complexes with the non-innocent N,N'-bis(pentafluorophenyl)-o-phenylenediamido ligand: twisted geometry for tuning the electronic structure. Dalton Trans 2008:1355-65. [PMID: 18305848 DOI: 10.1039/b714974c] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of homoleptic complexes with non-innocent ligands derived from N,N'-bis(pentafluorophenyl)-o-phenylenediamine (H(2)(F)pda) are reported. [Ni(II)((F)sbqdi)(2)] (1), [Pd(II)((F)sbqdi)(2)] (2), [Co(II)((F)sbqdi)(2)] (3), and [Cu(II)((F)sbqdi)(2)] (4) were synthesized, where ((F)sbqdi)(1-) represents a radical anion formed by one-electron oxidation of the doubly deprotonated H2(F)pda. The oxidation states of ligands and metals in complexes 1-4 were assigned by single crystal X-ray crystallography performed at low temperatures. Complex 4 is the first Cu(II) complex where both o-phenylenediamine derived ligands are monoanionic radicals. The bulky N-C6F5 substituents force the complexes 1, 3, and 4 to adopt a twisted geometry (intermediate between square-planar and tetrahedral). The electronic structures of the neutral compounds 1-4 and of some of their cationic and/or anionic neighboring redox states were probed using EPR and UV-VIS-NIR spectroelectrochemistry. The twisted geometry of the complexes results in considerable changes in their electronic structures compared to the well known square-planar complexes while the strongly electron withdrawing N-C6F5 groups have a great influence on redox properties.
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Affiliation(s)
- Marat M Khusniyarov
- Fachbereich Chemie der Philipps-Universität, Hans-Meerwein-Strasse, D-35032, Marburg, Germany
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43
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Banerjee P, Kar S, Bhaumik A, Lee GH, Peng SM, Goswami S. Isolation and Characterization of ZnII and HgII Coordination Polymers with a Designed Azo-Aromatic Ligand: Identification of Micrometer- and Nanometer-Sized Particles. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600878] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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44
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Gerber T, Luzipo D, Mayer P. Coordination of 2,3-diaminopyridine in the diamidopyridinium mode to the ReO3+ core. J COORD CHEM 2007. [DOI: 10.1080/00958970500069162] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Thomas Gerber
- a Department of Chemistry , Nelson Mandela Metropolitan University , 6000 Port Elizabeth, South Africa
| | - Dibanisile Luzipo
- a Department of Chemistry , Nelson Mandela Metropolitan University , 6000 Port Elizabeth, South Africa
| | - Peter Mayer
- b Department of Chemistry , Ludwig-Maximilians University , D-81377 München, Germany
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45
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Synthesis, structures, electrochemistry and catalytic activities of copper(II) and palladium(II) complexes with asymmetric tetraazacycloannulenes. Polyhedron 2007. [DOI: 10.1016/j.poly.2006.07.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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Synthesis and Structure of 3,10-Di(p-chlorobenzoyl)-4,9-dimethyl-2,11-diphenyl-1,5,8,12-monobenzotetraazacyclo[14]annulenenickel(II). B KOREAN CHEM SOC 2006. [DOI: 10.5012/bkcs.2006.27.10.1705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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47
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Li M, Deng C, Tu X, Cao Z, Xie Q, Fang Z, Ma M, Zhu M, Zhang Y, Yao S. EQCM study of influences of heparin and tannic acid on the precipitation of phenazinehydrine charge-transfer complex during redox switching of o-phenylenediamine in aqueous H2SO4. J Electroanal Chem (Lausanne) 2006. [DOI: 10.1016/j.jelechem.2006.05.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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48
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Kim DI, Hee Kim E, Ghosh Roy T, Gil Na H, Ung Bae Z, Chul Park Y. Catalytic activity of asymmetric monobenzoylmonobenzotetraazacyclo[14]tetradecinatonickel(II) complexes: X-ray crystal structure of monobenzo-2,4,9,11-tetramethyl-1,5,8,12-tetraazacyclo[14]tetradecinatonickel(II). J COORD CHEM 2006. [DOI: 10.1080/00958970512331331334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Dong Il Kim
- a Department of Chemistry , Kyungpook National University , Daegu 702-701, Korea
| | - Eun Hee Kim
- a Department of Chemistry , Kyungpook National University , Daegu 702-701, Korea
| | - Tapashi Ghosh Roy
- a Department of Chemistry , Kyungpook National University , Daegu 702-701, Korea
| | - Hun Gil Na
- b Department of Chemistry , Daejin University , Pochon 487-800, Korea
| | - Zun Ung Bae
- a Department of Chemistry , Kyungpook National University , Daegu 702-701, Korea
| | - Yu Chul Park
- a Department of Chemistry , Kyungpook National University , Daegu 702-701, Korea
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49
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Chłopek K, Bill E, Weyhermüller T, Wieghardt K. Molecular and electronic structure of five-coordinate complexes of iron(II/III) containing o-diiminobenzosemiquinonate(1-) pi radical ligands. Inorg Chem 2006; 44:7087-98. [PMID: 16180871 DOI: 10.1021/ic050829k] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of the ligand N-phenyl-1,2-benzenediamine (N-phenyl-o-phenylenediamine), H2[L(PDI)], in dry acetonitrile with [FeIII(dmf)6](ClO4)3 (dmf = N,N-dimethylformamide) affords the dimer (mu-NH,NH)[FeIII(L(ISQ))(L(PDI))]2 (1), where (L(ISQ))*- represents the pi radical monoanion N-phenyl-o-diiminobenzosemiquinonate and (L(PDI))2- is its one-electron-reduced, closed-shell form. Complex 1 possesses a diamagnetic ground-state St = 0. Addition reactions of tri-n-butylphosphane, tert-butyl isocyanide, cyclohexyl isocyanide, 4,5-diphenylimidazole, and 4-(1-phenylpentyl)pyridine with 1 in acetonitrile or toluene yields [FeII(L(ISQ))2(PBu3)] (2), [Fe(II)(L(ISQ))2(CN-tBu)] (4), [FeII(L(ISQ))2(CNCy)] (5), [FeIII(L(ISQ))2(Ph2Im)] (6), and [FeIII(L(ISQ))(L(PDI))(BuPhCH-py)].BuPhCH-py (7). Oxidation of 1 with iodine affords [FeIII(L(ISQ))2I] (3), and oxidation of 2 with ferrocenium hexafluorophosphate yields [FeIII(L(ISQ))2(PBu3)](PF6) (2ox). The structures of complexes 2, 2ox, 3, 5, 6, and 7 have been determined by X-ray crystallography at 100(2) K. Magnetic susceptibility measurements and EPR, UV-vis, and Mössbauer spectroscopy have established that mononuclear complexes containing the [FeII(L(ISQ))2X] chromophore (2, 4, 5) are diamagnetic (St = 0) whereas those with an [FeIII(L(ISQ))2X]n chromophore (3, 2(ox), 6) are paramagnetic (St = 1/2) and those with an [FeIII(L(ISQ))(L(PDI))X] chromophore (7) possess an St = 1 ground state. It is established that all ferric species have an intrinsic intermediate spin (SFe = 3/2) which is intramolecularly antiferromagnetically coupled to one or two (L(ISQ))*- ligand radicals yielding an St = 1 (7) or St = 1/2 (2ox, 3, 6) ground state, respectively. In the ferrous complexes 2, 4, and 5 the intrinsic spin at the iron ion is either low spin (SFe = 0) or intermediate spin (SFe = 1). Antiferromagnetic coupling between two radicals (L(ISQ))*- or, alternatively, between the intermediate spin ferrous ion and two radicals yields then the observed diamagnetic ground state. In 1 two [FeIII(L(ISQ))(L(PDI))] halves with S = 1 couple antiferromagnetically affording an St = 0 ground state.
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Affiliation(s)
- Krzysztof Chłopek
- Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr, Germany
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Tu X, Xie Q, Xiang C, Zhang Y, Yao S. Scanning Electrochemical Microscopy in Combination with Piezoelectric Quartz Crystal Impedance Analysis for Studying the Growth and Electrochemistry as Well as Microetching of Poly(o-phenylenediamine) Thin Films. J Phys Chem B 2005; 109:4053-63. [PMID: 16851463 DOI: 10.1021/jp044731n] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The combination of scanning electrochemical microscopy (SECM) with piezoelectric quartz crystal impedance (PQCI) analysis was proposed as a novel multiparameter method for investigating the cyclic voltammetric growth of poly(o-phenylenediamine) (PoPD) thin films at Au electrodes in aqueous solutions of various pH values and the potentiostatic microetching (localized degradation) of these films in 0.10 mol/L aqueous H2SO4 for comparative examinations on polymer porosity and stability. Two potential-sweep ranges, -0.4 to 0.9 (I) and 0 to 0.9 (II) V versus SCE, and four solutions, acidic (A, 0.20 mol/L H2SO4 + 0.10 mol/L Na2SO4; B, 0.10 mol/L H2SO4 + 0.20 mol/L Na2SO4), neutral (C, 0.10 mol/L PBS + 0.20 mol/L Na2SO4, pH 7.2), and alkaline (D, 0.20 mol/L NaOH + 0.20 mol/L Na2SO4) aqueous solutions, were selected for PoPD growth. The pH increase for the polymerization solution increased the molar percentage of polyaniline-like chains in PoPD, as quantified from the current peaks at approximately 0.6 V versus a saturated calomel electrode (SCE) for the oxidation of -NH2 groups in as-prepared PoPD (grown from solutions C and D) during their redox switching in 0.10 mol/L aqueous H2SO4 for the first time. The unusual PQCI responses observed at negative potentials (potential range I) in the first several potential cycles during the cyclic voltammetric growth of PoPD in acidic and neutral solutions have been reasonably explained as being due to the precipitation/dissolution of the poorly soluble phenazinehydrine charge-transfer complexes developed during redox switching of oligomers for the first time, which brought about much less compact PoPD films and their higher degradability than those grown in the same solution but over potential range II. SECM, scanning electron microscopy (SEM), and piezoelectric quartz crystal (PQC) frequency were used to estimate the sizes of etched microscale spots. In addition, the x-, y-, or z-axis movement of a Pt microelectrode of 25-mum diameter near the PQC electrode was found to influence negligibly the PQCI responses in 1.0 mol/L aqueous Na2SO4 containing K4Fe(CN)6 up to 0.10 mol/L, and a new protocol of dynamically electrodepositing silver microwires via the chemical-lens method was proposed for examining the local mass-sensitivity distribution on the PQC surface.
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Affiliation(s)
- Xinman Tu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education, Hunan Normal University, Changsha 410081, People's Republic of China
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