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Rhenium Tricarbonyl Complexes of Azodicarboxylate Ligands. Molecules 2022; 27:molecules27238159. [PMID: 36500250 PMCID: PMC9740152 DOI: 10.3390/molecules27238159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/18/2022] [Accepted: 11/21/2022] [Indexed: 11/25/2022] Open
Abstract
The excellent π-accepting azodicarboxylic esters adcOR (R = Et, iPr, tBu, Bn (CH2-C6H5) and Ph) and the piperidinyl amide derivative adcpip were used as bridging chelate ligands in dinuclear Re(CO)3 complexes [{Re(CO)3Cl}2(µ-adcOR)] and [{Re(CO)3Cl}2(µ-adcpip)]. From the adcpip ligand the mononuclear derivatives [Re(CO)3Cl(adcpip)] and [Re(CO)3(PPh3)(µ-adcpip)]Cl were also obtained. Optimised geometries from density functional theory (DFT) calculations show syn and anti isomers for the dinuclear fac-Re(CO)3 complexes at slightly different energies but they were not distinguishable from experimental IR or UV-Vis absorption spectroscopy. The electrochemistry of the adc complexes showed reduction potentials slightly below 0.0 V vs. the ferrocene/ferrocenium couple. Attempts to generate the radicals [{Re(CO)3Cl}2(µ-adcOR)]•- failed as they are inherently unstable, losing very probably first the Cl- coligand and then rapidly cleaving one [Re(CO)3] fragment. Consequently, we found signals in EPR very probably due to mononuclear radical complexes [Re(CO)3(solv)(adc)]•. The underlying Cl-→solvent exchange was modelled for the mononuclear [Re(CO)3Cl(adcpip)] using DFT calculations and showed a markedly enhanced Re-Cl labilisation for the reduced compared with the neutral complex. Both the easy reduction with potentials ranging roughly from -0.2 to -0.1 V for the adc ligands and the low-energy NIR absorptions in the 700 to 850 nm range place the adc ligands with their lowest-lying π* orbital being localised on the azo function, amongst comparable bridging chelate N^N coordinating ligands with low-lying π* orbitals of central azo, tetrazine or pyrazine functions. Comparative (TD)DFT-calculations on the Re(CO)3Cl complexes of the adcpip ligand using the quite established basis set and functionals M06-2X/def2TZVP/LANL2DZ/CPCM(THF) and the more advanced TPSSh/def2-TZVP(+def2-ECP for Re)/CPCMC(THF) for single-point calculations with BP86/def2-TZVP(+def2-ECP for Re)/CPCMC(THF) optimised geometries showed a markedly better agreement of the latter with the experimental XRD, IR and UV-Vis absorption data.
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Molecular and Electronic Structures, Spectra, Electrochemistry and Anti‐bacterial Efficacy of Novel Heterocyclic Hydrazones of Phenanthrenequinone and Their Nickel(II) Complexes. ChemistrySelect 2022. [DOI: 10.1002/slct.202202151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Mondal S, Schwederski B, Záliš S, Kaim W. Mixed Valency vs Radical Bridge Formulation in Symmetrically and Asymmetrically Ligated Diruthenium Complexes. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sudipta Mondal
- Universität Stuttgart: Universitat Stuttgart Institut für Anorganische Chemie GERMANY
| | - Brigitte Schwederski
- Universität Stuttgart: Universitat Stuttgart Institut fpür Anoranische Chemie GERMANY
| | - Stanislav Záliš
- Czech Academy of Sciences: Akademie ved Ceske republiky J. Heyrovský Institute of Physical Chemistry CZECH REPUBLIC
| | - Wolfgang Kaim
- Universität Stuttgart Institut für Anorganische Chemie Pfaffenwaldring 55 70550 Stuttgart GERMANY
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Yoshida J, Yamazaki K, Tateyama K, Yuge H, Sato H. Chiroptical switching behavior of heteroleptic ruthenium complexes bearing acetylacetonato and tropolonato ligands. Dalton Trans 2021; 50:14611-14617. [PMID: 34605516 DOI: 10.1039/d1dt02592a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four types of tris-chelate ruthenium complexes bearing acetylacetonato (acac) and tropolonato (trop) ligands were synthesized and optically resolved into Δ and Λ isomers: [Ru(acac)3] (Ru-0), [Ru(acac)2(trop)] (Ru-1), [Ru(acac)(trop)2] (Ru-2), and [Ru(trop)3] (Ru-3). Chiral HPLC chromatograms, electronic circular dichroism (ECD), and vibrational circular dichroism (VCD) of the four ruthenium complexes were systematically investigated. As a result, the absolute configurations of the newly prepared enantiomeric complexes Ru-2 and Ru-3 were determined. For the case of Ru-2, its absolute configuration was also confirmed by single crystal X-ray diffraction analysis. The ECD changes upon chemical oxidation were further investigated for the four complexes. An ECD change in enantiomeric Ru-1 was observed upon oxidation, but the oxidized species soon returned to the neutral state within a few minutes. Enantiomers of Ru-3 also showed explicit ECD changes upon oxidation. Further, the lifetime of the oxidized state was the longest among the four investigated complexes, whereas they racemized in solution at room temperature. In contrast, the enantiomers of heteroleptic complexes (Ru-1 and Ru-2) concurrently exhibited ECD changes, relatively long lifetime of the oxidized state, and nil or quite slow racemization behavior. The coexistence of acac and trop ligands was key to making the competing factors compatible in the resultant ruthenium complexes.
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Affiliation(s)
- Jun Yoshida
- Department of Chemistry, College of Humanities & Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.
| | - Kana Yamazaki
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato Minami-ku, Sagamihara, 252-0373, Japan
| | - Kazunori Tateyama
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato Minami-ku, Sagamihara, 252-0373, Japan
| | - Hidetaka Yuge
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato Minami-ku, Sagamihara, 252-0373, Japan
| | - Hisako Sato
- Graduate School of Science and Engineering, Ehime University, 2-5 Bunkyo-chou, Matsuyama, Ehime 790-8577, Japan
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Yoshida J, Tateyama K, Yuge H. Tris(tropolonato) ruthenium as a hub for connecting π-conjugated systems. Dalton Trans 2020; 49:2102-2111. [PMID: 32025681 DOI: 10.1039/c9dt04860j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, the intramolecular electronic communication between π-conjugated moieties bridged by the tris-chelate [Ru(trop)3] (trop = tropolonate) framework has been investigated and compared with [Ru(acac)3] (acac = acetylacetonate) derivatives. Two types of π-conjugated groups, -C2SiMe3 and -C2Ph, which were each introduced at the 5-position of tropolonate, were found to behave almost independently in the resultant ruthenium complexes. In contrast, the cyclic voltammetry study of [Ru(trop)3] derivatives showed a clear decrease in ΔE, the difference in the potentials of the two redox couples, with an increase in the number of π-conjugated groups introduced into the [Ru(trop)3] framework. The lower ΔE values observed in [Ru(trop)3] derivatives compared to those in [Ru(acac)3] derivatives illustrated the non-innocent behavior of the tropolonate ligand, i.e., the mixing between the metal- and ligand-based frontier orbitals. This orbital mixing was exemplified in the oxidized [Ru(trop)3] derivatives, which showed a broad near-infrared (NIR) absorption. The increase in the red shift of the NIR absorption with the increasing number of terminal groups indicated intramolecular electronic communication between the terminal π-conjugated moieties. In contrast, no NIR absorption was observed upon oxidation of [Ru(acac)3] derivatives with -C2Ph groups. The lifetimes of the in situ formed [Ru(trop)3]+ and [Ru(acac)3]+ in acetonitrile solution were found to be several hours and minutes, respectively. Density functional theory calculations for [Ru(trop)3] and [Ru(acac)3] with terminal -C2Ph groups demonstrated that the spin densities in their mono-oxidized states were evenly distributed over the entire molecular framework and localized mainly on one ligand, respectively. These results confirmed that the mono-oxidized [Ru(trop)3]+ framework can behave as a hub and induce moderate intramolecular electronic communication between terminal π-conjugated groups.
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Affiliation(s)
- Jun Yoshida
- Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato Minami-ku, Sagamihara, 252-0373, Japan.
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Dinda S, Roy S, Patra SC, Bhandary S, Pramanik K, Ganguly S. Polyaromatic hydrocarbon derivatized azo-oximes of cobalt( iii) for the ligand-redox controlled electrocatalytic oxygen reduction reaction. NEW J CHEM 2020. [DOI: 10.1039/c9nj05527d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Two new polyaromatic hydrocarbon (PAH) derivatized cobalt(iii) azo-oxime complexes were synthesized and their activity in electrocatalytic oxygen reduction reaction (ORR) were explored.
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Affiliation(s)
- Soumitra Dinda
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata–700016
- India
| | - Syamantak Roy
- Molecular Materials Laboratory
- Chemistry and Physics of Materials Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jakkur
- Bangalore
| | | | - Subhrajyoti Bhandary
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal By-pass Road
- Bhauri
- Bhopal
| | | | - Sanjib Ganguly
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata–700016
- India
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8
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Kaim W, Lahiri GK. The coordination potential of indigo, anthraquinone and related redox-active dyes. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.05.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mondal S, Filippou V, Bubrin M, Schwederski B, Fiedler J, Kaim W. Metalloradical Compounds with 1,2‐Dipivaloylhydrazido Ligands: Electron Transfer and Alkylation/Protonation Effects. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sudipta Mondal
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Vasileios Filippou
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Martina Bubrin
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Brigitte Schwederski
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Jan Fiedler
- J. Heyrovský Institute of Physical Chemistry The Czech Academy of Sciences Dolejškova 3 18223 Prague Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70550 Stuttgart Germany
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Abstract
Redox-active unsaturated chelate ligands can be realised with different ring sizes of the resulting metallacycles. An overview is presented, starting from an exposition of non-innocent behaviour and chelate effects. A systematic approach is used to describe the most familiar situation, the metal complexes of 1,4-hetero-1,3-dienes in established forms (e.g. o-quinone, α-dithiolene, and α-diimine ligands) and with less common combinations of O, S, and N heteroatoms. The different steric and electronic conditions in six-membered chelate ring systems derived from the β-diketonate structure will be discussed with examples of substituted and π extended ligands, including 9-oxidophenalenyl, formazanate, and anions derived from indigo or 9,10-anthraquinone. Four-membered chelate rings existing in at least two ligand-based oxidation states are available through steric and electronic stabilisation in amidinate or triazenide complexes. Three-membered and seven-membered chelate ring situations are discussed briefly as further alternatives.
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Affiliation(s)
- Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany.
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Klein J, Beerhues J, Schweinfurth D, van der Meer M, Gazvoda M, Lahiri GK, Košmrlj J, Sarkar B. Versatile Coordination of Azocarboxamides: Redox-Triggered Change of the Chelating Binding Pocket in Ruthenium Complexes. Chemistry 2018; 24:18020-18031. [PMID: 30136748 DOI: 10.1002/chem.201803606] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 08/22/2018] [Indexed: 11/09/2022]
Abstract
Azocarboxamides occupy a special place among azo ligands owing to their versatility for metal coordination. Herein ruthenium complexes with two different azocarboxamide ligands that differ in the presence (or not) of a coordinating pyridyl heterocycle are presented. By making full use of the O,N(amide), N(azo), and N(pyridyl) coordinating sites, the first diruthenium complex that is bridged by an azo ligand containing two different binding pockets was obtained. Moreover, it was conclusively proven that, in the mononuclear complexes, oxidation at the ruthenium center leads to a complete change of coordination at the chelating binding pocket. The complexes were characterized by NMR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction. Additionally, the mechanism of the aforementioned redox-triggered change in the chelating binding pocket and the electronic structures of all the complexes were investigated by a combination of electrochemistry, UV/Vis/NIR/EPR spectroelectrochemistry, and DFT calculations. This is first instance in which a redox-driven change in the complete chelating binding pocket has been observed in a ruthenium complex as well as with azo-based ligands. These results thus show the potential of these versatile azocarboxamide ligands to act as redox-driven switches with possible relevance to electrocatalysis.
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Affiliation(s)
- Johannes Klein
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
| | - Julia Beerhues
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
| | - David Schweinfurth
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
| | - Margarethe van der Meer
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
| | - Martin Gazvoda
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, 1000, Ljubljana, Slovenia
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Janez Košmrlj
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, 1000, Ljubljana, Slovenia
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
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12
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Khan FF, Klein J, Priego JL, Sarkar B, Jiménez-Aparicio R, Lahiri GK. Questions of Noninnocence and Ease of Azo Reduction in Diruthenium Frameworks with a 1,8-Bis((E)-phenyldiazenyl)naphthalene-2,7-dioxido Bridge. Inorg Chem 2018; 57:12800-12810. [DOI: 10.1021/acs.inorgchem.8b01996] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Farheen Fatima Khan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Johannes Klein
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstraße 34-36, D-14195 Berlin, Germany
| | - José Luis Priego
- Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstraße 34-36, D-14195 Berlin, Germany
| | - Reyes Jiménez-Aparicio
- Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Broere DLJ, Mercado BQ, Holland PL. Selective Conversion of CO 2 into Isocyanate by Low-Coordinate Iron Complexes. Angew Chem Int Ed Engl 2018; 57:6507-6511. [PMID: 29633494 PMCID: PMC6151862 DOI: 10.1002/anie.201802357] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Indexed: 11/10/2022]
Abstract
Discovery of the mechanisms for selective transformations of CO2 into organic compounds is a challenge. Herein, we describe the reaction of low-coordinate Fe silylamide complexes with CO2 to give trimethylsilyl isocyanate and the corresponding Fe siloxide complex. Kinetic studies show that this is a two-stage reaction, and the presence of a single equivalent of THF influences the rates of both steps. Isolation of a thermally unstable intermediate provides mechanistic insight that explains both the effect of THF in this reaction, and the way in which the reaction achieves high selectivity for isocyanate formation.
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Affiliation(s)
- Daniёl L. J. Broere
- Department of Chemistry,Yale University, 225 Prospect St., New Haven, CT 06511 (USA)
| | - Brandon Q. Mercado
- Department of Chemistry,Yale University, 225 Prospect St., New Haven, CT 06511 (USA)
| | - Patrick L. Holland
- Department of Chemistry,Yale University, 225 Prospect St., New Haven, CT 06511 (USA)
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Broere DLJ, Mercado BQ, Holland PL. Selective Conversion of CO2into Isocyanate by Low‐Coordinate Iron Complexes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802357] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Daniël L. J. Broere
- Department of ChemistryYale University 225 Prospect Street New Haven CT 06511 USA
| | - Brandon Q. Mercado
- Department of ChemistryYale University 225 Prospect Street New Haven CT 06511 USA
| | - Patrick L. Holland
- Department of ChemistryYale University 225 Prospect Street New Haven CT 06511 USA
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Mondal S, Schwederski B, Frey W, Fiedler J, Záliš S, Kaim W. At the Borderline between Metal–Metal Mixed Valency and a Radical Bridge Situation: Four Charge States of a Diruthenium Complex with a Redox-Active Bis(mer-tridentate) Ligand. Inorg Chem 2018. [DOI: 10.1021/acs.inorgchem.8b00173] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Sudipta Mondal
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Brigitte Schwederski
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Jan Fiedler
- The Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry, Dolejškova 3, 18223 Prague, Czech Republic
| | - Stanislav Záliš
- The Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry, Dolejškova 3, 18223 Prague, Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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Khan FF, Mandal A, Klein J, Priego JL, Jiménez-Aparicio R, Sarkar B, Lahiri GK. Mixed Donor-Acceptor-Derived N
,N′
-Diarylpyrazine-2,5-dicarboxamido-Bridged Diruthenium Systems: Structures, Magnetic Properties, and Electronic Forms in Multiredox States. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201701009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Farheen Fatima Khan
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Powai, Mumbai India
| | - Abhishek Mandal
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Powai, Mumbai India
| | - Johannes Klein
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universitaet Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - José Luis Priego
- Departamento de Química Inorgánica; Facultad de Ciencias Químicas; Universidad Complutense; 28040 Madrid Spain
| | - Reyes Jiménez-Aparicio
- Departamento de Química Inorgánica; Facultad de Ciencias Químicas; Universidad Complutense; 28040 Madrid Spain
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie; Anorganische Chemie; Freie Universitaet Berlin; Fabeckstraße 34-36 14195 Berlin Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Powai, Mumbai India
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Roy S, Pramanik S, Patra SC, Adhikari B, Mondal A, Ganguly S, Pramanik K. Ambient-Stable Bis-Azoaromatic-Centered Diradical [(L •)M(L •)] Complexes of Rh(III): Synthesis, Structure, Redox, and Spin-Spin Interaction. Inorg Chem 2017; 56:12764-12774. [PMID: 29028330 DOI: 10.1021/acs.inorgchem.7b01514] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Bis-azoaromatic electron traps, viz. 2-(2-pyridylazo)azoarene 1, have been synthesized by colligating electron-deficient pyridine and azoarene moieties, and they act as apposite proradical templates for the formation of stable open-shell diradical complexes [(1•-)RhIII(1•-)]+ ([2]+), starting from the low-valent electron reservoir [RhI]. The less stable monoradical [RhIII(1•-)Cl2(PPh3)3] (3) has also been isolated as a minor product. These π-radical complexes are multiredox systems, and the electron transfer processes occur exclusively within the pincer-type NNN ligand backbone 1. Molecular and electronic structures of the diradicals and monoradicals have been ascertained with the aid of X-ray diffraction, electrochemical, spectroelectrochemical, and spectral (electronic, IR, NMR, and EPR) studies. In the diradicals [2]+, the orthogonal disposition of two ligand π orbitals linked via a closed-shell metal center (t26) impedes significant coupling between the radicals. Indeed, the observed magnetic moment of [2a]+ lies near ∼2.3 μB over the temperature range 50-300 K. A very weak antiferromagnetic (AF) intramolecular spin-spin interaction between two ligand π arrays in [(1•-)RhIII(1•-)]+ have been found experimentally (J ≈ -5 cm-1), and this is further substantiated by density functional theory (DFT) calculations at the (U)B3LYP/6-31G(d,p) level.
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Affiliation(s)
- Sima Roy
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University , Kolkata 700032, India
| | - Shuvam Pramanik
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University , Kolkata 700032, India
| | - Sarat Chandra Patra
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University , Kolkata 700032, India
| | - Basab Adhikari
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University , Kolkata 700032, India
| | - Abhishake Mondal
- University of Bordeaux , CRPP, UPR 8641, 33600 Pessac, France.,Solid State and Structural Chemistry Unit, Indian Institute of Science , C. V. Raman Road, 560012, Bangalore, India
| | - Sanjib Ganguly
- Department of Chemistry, St. Xavier's College , Kolkata 700016, India
| | - Kausikisankar Pramanik
- Department of Chemistry, Inorganic Chemistry Section, Jadavpur University , Kolkata 700032, India
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Yoshida J, Kuwahara K, Suzuki K, Yuge H. Long-Range Intramolecular Electronic Communication in a Trinuclear Ruthenium Tropolonate Complex. Inorg Chem 2017; 56:1846-1856. [DOI: 10.1021/acs.inorgchem.6b02249] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun Yoshida
- Department of Chemistry, School of Science, Kitasato University 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Kyohei Kuwahara
- Department of Chemistry, School of Science, Kitasato University 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Kota Suzuki
- Department of Chemistry, School of Science, Kitasato University 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
| | - Hidetaka Yuge
- Department of Chemistry, School of Science, Kitasato University 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan
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19
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Pramanik S, Dutta S, Roy S, Dinda S, Ghorui T, Kumar Mitra A, Pramanik K, Ganguly S. Luminescent closed shell nickel(ii) pyridyl-azo-oximates and the open shell anion radical congener: molecular and electronic structure, ligand redox behaviour and biological activity. NEW J CHEM 2017. [DOI: 10.1039/c7nj00402h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Luminescent nickel(ii) complexes have been synthesized using redox-active azo-oximes. The superior π-acidity of the organic backbone is a key to the isolation of Ni(ii) anion radicals.
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Affiliation(s)
- Shuvam Pramanik
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata
- India
| | - Suhana Dutta
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata
- India
| | - Sima Roy
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata
- India
| | - Soumitra Dinda
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata
- India
| | - Tapas Ghorui
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata
- India
| | - Arup Kumar Mitra
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata
- India
| | | | - Sanjib Ganguly
- Department of Chemistry
- St. Xavier's College (Autonomous)
- Kolkata
- India
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20
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Kaim W. Electron Transfer Reactivity of Organometallic Compounds Involving Radical-Forming Noninnocent Ligands. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2016. [DOI: 10.1007/s40010-016-0304-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Ansari MA, Mandal A, Paretzki A, Beyer K, Fiedler J, Kaim W, Lahiri GK. 1,5-Diamido-9,10-anthraquinone, a Centrosymmetric Redox-Active Bridge with Two Coupled β-Ketiminato Chelate Functions: Symmetric and Asymmetric Diruthenium Complexes. Inorg Chem 2016; 55:5655-70. [DOI: 10.1021/acs.inorgchem.6b00726] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mohd. Asif Ansari
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Abhishek Mandal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Alexa Paretzki
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Katharina Beyer
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Jan Fiedler
- J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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22
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Mondal P, Chatterjee M, Paretzki A, Beyer K, Kaim W, Lahiri GK. Noninnocence of Indigo: Dehydroindigo Anions as Bridging Electron-Donor Ligands in Diruthenium Complexes. Inorg Chem 2016; 55:3105-16. [DOI: 10.1021/acs.inorgchem.6b00038] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Prasenjit Mondal
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Madhumita Chatterjee
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Alexa Paretzki
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Katharina Beyer
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Wolfgang Kaim
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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23
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Pramanik S, Roy S, Ghorui T, Ganguly S, Pramanik K. Iridium(III) Mediated Reductive Transformation of Closed-Shell Azo-Oxime to Open-Shell Azo-Imine Radical Anion: Molecular and Electronic Structure, Electron Transfer, and Optoelectronic Properties. Inorg Chem 2016; 55:1461-8. [DOI: 10.1021/acs.inorgchem.5b02185] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuvam Pramanik
- Department
of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Sima Roy
- Department
of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Tapas Ghorui
- Department
of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
| | - Sanjib Ganguly
- Department
of Chemistry, St. Xavier’s College, Kolkata 700016, India
| | - Kausikisankar Pramanik
- Department
of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700032, India
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24
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Mondal P, Plebst S, Ray R, Mobin SM, Kaim W, Lahiri GK. Uncommon cis Configuration of a Metal–Metal Bridging Noninnocent Nindigo Ligand. Inorg Chem 2014; 53:9348-56. [DOI: 10.1021/ic501460d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Prasenjit Mondal
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sebastian Plebst
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Ritwika Ray
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Shaikh M. Mobin
- Discipline
of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Indore 452017, India
| | - Wolfgang Kaim
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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25
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Mondal P, Agarwala H, Jana RD, Plebst S, Grupp A, Ehret F, Mobin SM, Kaim W, Lahiri GK. Sensitivity of a Strained C–C Single Bond to Charge Transfer: Redox Activity in Mononuclear and Dinuclear Ruthenium Complexes of Bis(arylimino)acenaphthene (BIAN) Ligands. Inorg Chem 2014; 53:7389-403. [DOI: 10.1021/ic500730m] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Prasenjit Mondal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Hemlata Agarwala
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Rahul Dev Jana
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sebastian Plebst
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Anita Grupp
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Fabian Ehret
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Shaikh M. Mobin
- Discipline of Chemistry, School of Basic
Sciences, Indian Institute of Technology Indore, Indore 452017, India
| | - Wolfgang Kaim
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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26
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Das A, Agarwala H, Kundu T, Ghosh P, Mondal S, Mobin SM, Lahiri GK. Electronic structures and selective fluoride sensing features of Os(bpy)2(HL2−) and [{Os(bpy)2}2(μ-HL2−)]2+ (H3L: 5-(1H-benzo[d]imidazol-2-yl)-1H-imidazole-4-carboxylic acid). Dalton Trans 2014; 43:13932-47. [DOI: 10.1039/c4dt01821d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The non-innocence of coordinated HL2− in [(bpy)2Os(HL2−)]n (1n) and (2n) and their selectivity towards F− recognition were evaluated.
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Affiliation(s)
- Ankita Das
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076, India
| | - Hemlata Agarwala
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076, India
| | - Tanaya Kundu
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076, India
| | - Prabir Ghosh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076, India
| | - Sudipta Mondal
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076, India
| | - Shaikh M. Mobin
- Discipline of Chemistry
- School of Basic Sciences
- Indian Institute of Technology Indore
- Indore 452017, India
| | - Goutam Kumar Lahiri
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076, India
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27
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Jana R, Lissner F, Schwederski B, Fiedler J, Kaim W. A Ligand-Bridged Heterotetranuclear (Fe2Cu2) Redox System with Fc/Fc+ and Radical Ion Intermediates. Organometallics 2013. [DOI: 10.1021/om400466u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Rajkumar Jana
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550
Stuttgart, Germany
| | - Falk Lissner
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550
Stuttgart, Germany
| | - Brigitte Schwederski
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550
Stuttgart, Germany
| | - Jan Fiedler
- J. Heyrovský Institute of Physical Chemistry,
v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech
Republic
| | - Wolfgang Kaim
- Institut
für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550
Stuttgart, Germany
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28
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Mondal P, Ehret F, Bubrin M, Das A, Mobin SM, Kaim W, Lahiri GK. A Diruthenium Complex of a “Nindigo” Ligand. Inorg Chem 2013; 52:8467-75. [DOI: 10.1021/ic400390b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Prasenjit Mondal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai
400076, India
| | - Fabian Ehret
- Institut
für Anorganische
Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Martina Bubrin
- Institut
für Anorganische
Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Amit Das
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai
400076, India
| | - Shaikh M. Mobin
- Discipline of Chemistry, School
of Basic Sciences, Indian Institute of Technology Indore, Indore 452017, India
| | - Wolfgang Kaim
- Institut
für Anorganische
Chemie, Universität Stuttgart, Pfaffenwaldring
55, D-70550 Stuttgart, Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai
400076, India
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29
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30
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Köthe C, Metzinger R, Limberg C. Reduction and Hydrogenation of a Diazene by a (β‐Diketiminato)nickel Hydrazide. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300064] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Claudia Köthe
- Humboldt‐Universität zu Berlin, Institut für Chemie Brook‐Taylor‐Str. 2, 12489 Berlin, Germany, Fax: +49‐30‐2093‐6966, http://www.chemie.hu‐berlin.de/aglimberg/
| | - Ramona Metzinger
- Humboldt‐Universität zu Berlin, Institut für Chemie Brook‐Taylor‐Str. 2, 12489 Berlin, Germany, Fax: +49‐30‐2093‐6966, http://www.chemie.hu‐berlin.de/aglimberg/
| | - Christian Limberg
- Humboldt‐Universität zu Berlin, Institut für Chemie Brook‐Taylor‐Str. 2, 12489 Berlin, Germany, Fax: +49‐30‐2093‐6966, http://www.chemie.hu‐berlin.de/aglimberg/
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31
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Das A, Kundu T, Mobin SM, Priego JL, Jiménez-Aparicio R, Lahiri GK. Influence of ancillary ligands on the electronic structure and anion sensing features of ligand bridged diruthenium complexes. Dalton Trans 2013; 42:13733-46. [DOI: 10.1039/c3dt50853f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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