1
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Schoeller conceptulization M, Preinerová K, Jorík V, Mazúr M, Moncoľ J. Stable Manganese(II) Complex with Chlorido-substituted Hexadentate Schiff Base: Syntheses, Crystal Structure and Spectral properties. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.110237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Weller R, Balmer M, Hänisch CV, Gunnar Werncke C. Synthesis of the open-shell 3d-transition metal(II) bis(phosphinidenide) [Mn{P(sIDipp)} 2]. Dalton Trans 2022; 51:1765-1768. [PMID: 35013743 DOI: 10.1039/d1dt03805b] [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
The synthesis and characterization of the first homoleptic open-shell transition metal phosphinidenide is presented. By reacting [MnL2] (L = -N(SiMe3)2) with [(sIDipp)PK] (sIDipp = 1,3-bis(2,6-di-iso-propylphenyl)-imidazolidine-2-ylidene), the formation of [Mn{P(sIDipp)}2] instead of the initially expected adduct [KMn{P(sIDipp)}L2] is observed. Interestingly, a solvent change from toluene to n-pentane leads to the formation of [(sIDipp)PK2(Et2O)4][MnL3] after work-up, which can be seen as intermediate in the formation process of [Mn{P(sIDipp)}2]. Contrary to manganese, the highly reducing phosphinidenide [(sIDipp)P]- cannot be stabilized in an analogous fashion by coordination to a low-coordinate high-spin iron(II) center.
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Affiliation(s)
- Ruth Weller
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany.
| | - Markus Balmer
- Dockweiler Chemicals GmbH, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany
| | - Carsten von Hänisch
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany.
| | - C Gunnar Werncke
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany.
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3
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Uzal-Varela R, Lalli D, Brandariz I, Rodríguez-Rodríguez A, Platas-Iglesias C, Botta M, Esteban-Gómez D. Rigid versions of PDTA 4- incorporating a 1,3-diaminocyclobutyl spacer for Mn 2+ complexation: stability, water exchange dynamics and relaxivity. Dalton Trans 2021; 50:16290-16303. [PMID: 34730583 DOI: 10.1039/d1dt02498a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Rigid derivatives of the acyclic ligand PDTA4- (H4PDTA = propylenediamine-N,N,N',N'-tetraacetic acid) were prepared by functionalization of a 1,3-diaminocyclobutyl spacer. The new ligands contain either four acetate groups attached to the central scaffold (H4L1) or incorporate pyridyl (H2L2) or propylamide (H2L3) units replacing two of the carboxylate groups. The ligand protonation constants and the stability constants of their Mn2+ complexes were determined using potentiometric and spectrophotometric titrations. The stability of the [Mn(L1)]2- complex was found to be significantly higher than that of the flexible [Mn(PDTA)]2- derivative (log KMnL = 10.78 and 10.01, respectively). A detailed study of the 1H Nuclear Magnetic Relaxation Dispersion (NMRD) profiles and 17O NMR measurements evidence that the [Mn(L1)]2- and [Mn(L2)] complexes display a hydration equilibrium in solution involving a seven-coordinate species with an inner-sphere water molecule and a six-coordinate species that lacks a coordinated water molecule. As a result the 1H relaxivities of these complexes are somewhat lower than that of [Mn(EDTA)]2- and related systems. The introduction of propylamide groups in [Mn(L3)] shifts the hydration equilibrium to the seven-coordinate species, which results in a 1H relaxivity (r1p = 3.7 mM-1 s-1 at 22 MHz and 25 °C) exceeding that of [Mn(EDTA)]2- (r1p = 3.3 mM-1 s-1 at 22 MHz and 25 °C). The parameters that control the relaxivities in this family of complexes were determined by simultaneous fitting of the experimental 1H NMRD and 17O NMR data (transverse relaxation rates and chemical shifts), with the aid of computational studies performed at the DFT and CASSCF/NEVPT2 levels. These studies provide detailed insight of the parameters that control the efficiency of these relaxation agents at the molecular level.
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Affiliation(s)
- Rocío Uzal-Varela
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Daniela Lalli
- Magnetic Resonance Platform (PRISMA-UPO), Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Isabel Brandariz
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Aurora Rodríguez-Rodríguez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Mauro Botta
- Magnetic Resonance Platform (PRISMA-UPO), Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
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4
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Uzal-Varela R, Valencia L, Lalli D, Maneiro M, Esteban-Gómez D, Platas-Iglesias C, Botta M, Rodríguez-Rodríguez A. Understanding the Effect of the Electron Spin Relaxation on the Relaxivities of Mn(II) Complexes with Triazacyclononane Derivatives. Inorg Chem 2021; 60:15055-15068. [PMID: 34618439 PMCID: PMC8527457 DOI: 10.1021/acs.inorgchem.1c02057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Investigating the relaxation of water 1H nuclei induced by paramagnetic Mn(II) complexes is important to understand the mechanisms that control the efficiency of contrast agents used in diagnostic magnetic resonance imaging (MRI). Herein, a series of potentially hexadentate triazacyclononane (TACN) derivatives containing different pendant arms were designed to explore the relaxation of the electron spin in the corresponding Mn(II) complexes by using a combination of 1H NMR relaxometry and theoretical calculations. These ligands include 1,4,7-triazacyclononane-1,4,7-triacetic acid (H3NOTA) and three derivatives in which an acetate group is replaced by sulfonamide (H3NO2ASAm), amide (H2NO2AM), or pyridyl (H2NO2APy) pendants. The analogue of H3NOTA containing three propionate pendant arms (H3NOTPrA) was also investigated. The X-ray structure of the derivative containing two acetate groups and a sulfonamide pendant arm [Mn(NO2ASAm)]- evidenced six-coordination of the ligand to the metal ion, with the coordination polyhedron being close to a trigonal prism. The relaxivities of all complexes at 20 MHz and 25 °C (1.1-1.3 mM-1 s-1) are typical of systems that lack water molecules coordinated to the metal ion. The nuclear magnetic relaxation profiles evidence significant differences in the relaxivities of the complexes at low fields (<1 MHz), which are associated with different spin relaxation rates. The zero field splitting (ZFS) parameters calculated by using DFT and CASSCF methods show that electronic relaxation is relatively insensitive to the nature of the donor atoms. However, the twist angle of the two tripodal faces that delineate the coordination polyhedron, defined by the N atoms of the TACN unit (lower face) and the donor atoms of the pendant arms (upper face), has an important effect in the ZFS parameters. A twist angle close to the ideal value for an octahedral coordination (60°), such as that in [Mn(NOTPrA)]-, leads to a small ZFS energy, whereas this value increases as the coordination polyhedron approaches to a trigonal prism.
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Affiliation(s)
- Rocío Uzal-Varela
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Laura Valencia
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidade de Vigo, As Lagoas, Marcosende, 36310 Pontevedra, Spain
| | - Daniela Lalli
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Marcelino Maneiro
- Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Facultade de Ciencias, Campus de Lugo, 27002 Lugo, Galicia, Spain
| | - David Esteban-Gómez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Carlos Platas-Iglesias
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
| | - Mauro Botta
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale "A. Avogadro", Viale T. Michel 11, 15121 Alessandria, Italy
| | - Aurora Rodríguez-Rodríguez
- Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, Universidade da Coruña, 15071, A Coruña, Galicia, Spain
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5
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Nano K, Zahariou G, Ioannou PC, Alam MM, Pantazis DA, Raptopoulou CP, Psycharis V, Sanakis Y, Kyritsis P. Electronic properties of the S = 5/2 Mn(II) complexes [Mn{PhC(O)NP(O)PPh2}(N,N)(NO3)], (N,N) = phenanthroline, neocuproine, 2,2′-bipyridine. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Synthesis and electron paramagnetic resonance studies of seven coordinated Mn(II) complexes with tridentate N-donor ligands. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Oleshkevich E, Romero I, Teixidor F, Viñas C. All inorganic coordination polymers have been made possible with the m-carboranylphosphinate ligand. Dalton Trans 2018; 47:14785-14798. [PMID: 30295298 DOI: 10.1039/c8dt03264e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New examples of 1D coordination polymers (CPs) and complexes containing the purely inorganic carboranylphosphinate ligand [1-OPH(O)-1,7-closo-C2B10H11]- are reported. The reaction of Na[1-OPH(O)-1,7-closo-C2B10H11] salt with MCl2 (M = Mn, Co, Ni, Cu, Zn and Cd) in MeOH or EtOH leads to compounds 1-8. All compounds have been exhaustively characterized by analytical and spectroscopic techniques. X-ray analysis and spectroscopy characterization revealed the differences between the isolated compounds: 1D polymeric chains (CPs) with carboranylphosphinate ligand bridges have been obtained with MnII, CdII or ZnII centres, whereas compounds with low nuclearity have been isolated with CuII, CoII and NiII. No polymeric structures were obtained in the CoII and NiII complexes due to the higher affinity of these metals for water than that for the m-carboranylphosphinate and accordingly, these complexes generate supramolecular hydrophobic/hydrophilic structures. The reactivity of manganese polymer 1 with water leads to the breakage of the polymer with the formation of a new mononuclear compound 2, and that in methanol leads back to the initial polymer 1. However, the reactivity of polymer 1 with 2,2'-bpy maintains the core present in the initial polymer, leading to the CP 3, which in methanol/water medium produces species of lower nuclearity. The magnetic properties of the compounds studied show weak antiferromagnetic coupling.
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Affiliation(s)
- Elena Oleshkevich
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain.
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8
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Fu WW, Shu X, Luo YL, Tang ZQ, Li Q, Liu HJ, Cheng QW, Wang HY, Liu Y. New Co(II) And Mn(II) Complexes with 4′-Substituted 2,2′:6′,2″-Terpyridine Ligands. J STRUCT CHEM+ 2018. [DOI: 10.1134/s002247661802021x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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9
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Oleshkevich E, Viñas C, Romero I, Choquesillo-Lazarte D, Haukka M, Teixidor F. m-Carboranylphosphinate as Versatile Building Blocks To Design all Inorganic Coordination Polymers. Inorg Chem 2017; 56:5502-5505. [DOI: 10.1021/acs.inorgchem.7b00610] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Elena Oleshkevich
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
| | - Clara Viñas
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
| | - Isabel Romero
- Departament de Química
and Serveis Tècnics de Recerca, Universitat de Girona, Campus de
Montilivi, E-17071 Girona, Spain
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT (CSIC-UGR), Av de las Palmeras 4, 18100 Armilla (Granada), Spain
| | - Matti Haukka
- Department
of Chemistry, University of Jyväskylä, FIN-40014 Jyväskylä, Finland
| | - Francesc Teixidor
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
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10
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Escriche-Tur L, Font-Bardia M, Albela B, Corbella M. Determination of ZFS parameters from the EPR spectra of mono-, di- and trinuclear Mn II complexes: impact of magnetic coupling. Dalton Trans 2017; 46:2699-2714. [PMID: 28170010 DOI: 10.1039/c6dt04012h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A family of new MnII compounds, consisting of seven dinuclear, three mononuclear, and four trinuclear ones, were synthesised using benzoic acid derivatives n-RC6H4COOH, where n-R = 2-MeO, 3-MeO, 4-MeO, or 4-tBu, and 2,2'-bipyridine (bpy) or 1,10-phenantroline (phen) as blocking ligands. The crystal structures of nine of these compounds and the magnetic studies of all of them are reported here. Each type of compound was formed depending on the presence or absence of ClO4- ions, the solvent used, and/or the presence of a small amount of water in the reaction medium. The use of the tert-buthylbenzoate ligand gave unexpected results, very likely due to the steric hindrance caused by the voluminous tBu groups. The EPR spectra of each type of compound give some peculiar features that allow its identification. Attempts to fit these spectra have been made in order to determine the ZFS parameters, D and E, of the MnII ion (for mononuclear and dinuclear systems) or of the ground state (for trinuclear systems). For trinuclear systems, the single-ion ZFS parameters estimated from those of the ground state provided a good simulation of the EPR spectra of these compounds. The EPR signals observed in each case have been rationalised according to the energy level distribution and the plausible population in the excited states. In some particular situations, the sign of DMn could be determined from the fit of the EPR spectra of the antiferromagnetic dinuclear compounds, the source of the difference between the spectra lying in the second excited state.
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Affiliation(s)
- Luis Escriche-Tur
- Departament de Química Inorgànica i Orgànica (Secció inorgánica), Universitat de Barcelona, C/Martí i Franquès 1-11, 08028 Barcelona, Spain. and Laboratoire de Chimie, ENS de Lyon, Université de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France
| | - Mercè Font-Bardia
- Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain
| | - Belén Albela
- Laboratoire de Chimie, ENS de Lyon, Université de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France
| | - Montserrat Corbella
- Departament de Química Inorgànica i Orgànica (Secció inorgánica), Universitat de Barcelona, C/Martí i Franquès 1-11, 08028 Barcelona, Spain. and Institud de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN2UB), Av. Joan XXIII s/n, 08028 Barcelona, Spain
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11
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Leto DF, Massie AA, Colmer HE, Jackson TA. X-Band Electron Paramagnetic Resonance Comparison of Mononuclear Mn(IV)-oxo and Mn(IV)-hydroxo Complexes and Quantum Chemical Investigation of Mn(IV) Zero-Field Splitting. Inorg Chem 2016; 55:3272-82. [PMID: 27002928 DOI: 10.1021/acs.inorgchem.5b02309] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
X-band electron paramagnetic resonance (EPR) spectroscopy was used to probe the ground-state electronic structures of mononuclear Mn(IV) complexes [Mn(IV)(OH)2(Me2EBC)](2+) and [Mn(IV)(O)(OH)(Me2EBC)](+). These compounds are known to effect C-H bond oxidation reactions by a hydrogen-atom transfer mechanism. They provide an ideal system for comparing Mn(IV)-hydroxo versus Mn(IV)-oxo motifs, as they differ by only a proton. Simulations of 5 K EPR data, along with analysis of variable-temperature EPR signal intensities, allowed for the estimation of ground-state zero-field splitting (ZFS) and (55)Mn hyperfine parameters for both complexes. From this analysis, it was concluded that the Mn(IV)-oxo complex [Mn(IV)(O)(OH)(Me2EBC)](+) has an axial ZFS parameter D (D = +1.2(0.4) cm(-1)) and rhombicity (E/D = 0.22(1)) perturbed relative to the Mn(IV)-hydroxo analogue [Mn(IV)(OH)2(Me2EBC)](2+) (|D| = 0.75(0.25) cm(-1); E/D = 0.15(2)), although the complexes have similar (55)Mn values (a = 7.7 and 7.5 mT, respectively). The ZFS parameters for [Mn(IV)(OH)2(Me2EBC)](2+) were compared with values obtained previously through variable-temperature, variable-field magnetic circular dichroism (VTVH MCD) experiments. While the VTVH MCD analysis can provide a reasonable estimate of the magnitude of D, the E/D values were poorly defined. Using the ZFS parameters reported for these complexes and five other mononuclear Mn(IV) complexes, we employed coupled-perturbed density functional theory (CP-DFT) and complete active space self-consistent field (CASSCF) calculations with second-order n-electron valence-state perturbation theory (NEVPT2) correction, to compare the ability of these two quantum chemical methods for reproducing experimental ZFS parameters for Mn(IV) centers. The CP-DFT approach was found to provide reasonably acceptable values for D, whereas the CASSCF/NEVPT2 method fared worse, considerably overestimating the magnitude of D in several cases. Both methods were poor in reproducing experimental E/D values. Overall, this work adds to the limited investigations of Mn(IV) ground-state properties and provides an initial assessment for calculating Mn(IV) ZFS parameters with quantum chemical methods.
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Affiliation(s)
- Domenick F Leto
- Department of Chemistry and Center for Environmentally Beneficial Catalysis, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - Allyssa A Massie
- Department of Chemistry and Center for Environmentally Beneficial Catalysis, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - Hannah E Colmer
- Department of Chemistry and Center for Environmentally Beneficial Catalysis, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - Timothy A Jackson
- Department of Chemistry and Center for Environmentally Beneficial Catalysis, University of Kansas , 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
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12
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Buvaylo EA, Melnyk AK, Trachevsky VV, Vassilyeva OY, Skelton BW. Divalent manganese, cobalt and nickel chloride complexes with neutral N 2 - and N 3 -based ligands derived from 2-pyridinecarbaldehyde: Synthesis, structural features and spectroscopic studies. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.12.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Abstract
EPR spectroscopy combined with quantum chemistry for the investigation of the magnetic anisotropy of MnII, MnIII and MnIV.
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Affiliation(s)
- Carole Duboc
- University Grenoble-Alpes
- CNRS
- UMR 5250
- Département de Chimie Moléculaire
- 38041 Grenoble cedex 9
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14
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Zienkiewicz M, Jabłońska-Wawrzycka A, Szlachetko J, Kayser Y, Stadnicka K, Sawka-Dobrowolska W, Jezierska J, Barszcz B, Sá J. Effective catalytic disproportionation of aqueous H2O2 with di- and mono-nuclear manganese(II) complexes containing pyridine alcohol ligands. Dalton Trans 2015; 43:8599-608. [PMID: 24406400 DOI: 10.1039/c3dt53288g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The two novel manganese(II) complexes with 2-hydroxymethylpyridine (2-CH2OHpy) {[Mn2(μ-Cl)2(2-CH2OHpy)4]Cl2·2H2O (1)} and 2-hydroxyethylpyridine (2-(CH2)2OHpy) {[Mn(2-(CH2)2OHpy)2(NCS)2] (2)} were synthesized and characterized by means of X-ray diffraction, IR, EPR, HF EPR spectroscopy, magnetic and TG/DTG data. The complexes show catalase-like activity in neutral aqueous solution since they were able to disproportionate H2O2 to harmless H2O and O2. Both complexes act as true catalysts since they reverted to their original form after depleting all the H2O2, as suggested by the operando resonant inelastic X-ray spectroscopy (RIXS) measurements.
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Affiliation(s)
- M Zienkiewicz
- Institute of Chemistry, Jan Kochanowski University in Kielce, 15G Swiętokrzyska Str., 25-406 Kielce, Poland.
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15
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Gerey B, Gennari M, Gouré E, Pécaut J, Blackman A, Pantazis DA, Neese F, Molton F, Fortage J, Duboc C, Collomb MN. Calcium and heterometallic manganese–calcium complexes supported by tripodal pyridine-carboxylate ligands: structural, EPR and theoretical investigations. Dalton Trans 2015; 44:12757-70. [DOI: 10.1039/c5dt01776a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rare examples of heteronuclear μ-carboxylato bridged Mn–Ca complexes are reported.
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Affiliation(s)
- Bertrand Gerey
- Univ. Grenoble Alpes
- F-38000 Grenoble
- France
- CNRS
- F-38000 Grenoble
| | | | - Eric Gouré
- Univ. Grenoble Alpes
- F-38000 Grenoble
- France
- CNRS
- F-38000 Grenoble
| | | | - Allan Blackman
- School of Applied Sciences
- Auckland University of Technology
- Auckland 1142
- New Zealand
| | - Dimitrios A. Pantazis
- Max-Planck-Institut für Chemische Energie Konversion
- D-45470 Mülheim an der Ruhr
- Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energie Konversion
- D-45470 Mülheim an der Ruhr
- Germany
| | - Florian Molton
- Univ. Grenoble Alpes
- F-38000 Grenoble
- France
- CNRS
- F-38000 Grenoble
| | - Jérôme Fortage
- Univ. Grenoble Alpes
- F-38000 Grenoble
- France
- CNRS
- F-38000 Grenoble
| | - Carole Duboc
- Univ. Grenoble Alpes
- F-38000 Grenoble
- France
- CNRS
- F-38000 Grenoble
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16
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Jabłońska-Wawrzycka A, Barszcz B, Zienkiewicz M, Hodorowicz M, Jezierska J, Stadnicka K, Lechowicz Ł, Kaca W. Eight- and six-coordinated Mn(II) complexes of heteroaromatic alcohol and aldehyde: crystal structure, spectral, magnetic, thermal and antibacterial activity studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:632-642. [PMID: 24803341 DOI: 10.1016/j.saa.2014.03.105] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 02/14/2014] [Accepted: 03/22/2014] [Indexed: 06/03/2023]
Abstract
Crystal, molecular and electronic structure of new manganese(II) compounds: [Mn(2-CH2OHpy)2(NO3)2] (1), [Mn(4-CHO-5-MeIm)2(NO3)2] (2) and [Mn(4-CHO-5-MeIm)2Cl2] (3), where 2-hydroxymethylpyridine (2-CH2OHpy) and 5(4)-carbaldehyde-4(5)-methylimidazole (5(4)-CHO-4(5)-MeIm), have been characterised using X-ray, spectroscopic, magnetic and TG/DTG data. In compounds 1 and 2, the Mn(II) ion is eight-coordinated forming distorted pseudo-dodecahedron, that is rather unusual for the manganese(II) complexes, whereas in 3 the Mn(II) ion environment is a distorted octahedron. The high coordination number (CN=8) of 1 and 2 results from bidentate character of the nitrate ligands. The X-band EPR spectra of compounds 2 and 3 exhibit fine structure signals resulting from zero-field splitting (ZFS) of the spin states for high spin d(5) Mn(II), whereas for 1 the broad isotropic signals were observed. The estimation of ZFS for individual Mn(II) ions was carried out for all compounds using DFT calculations. The free ligands and their manganese(II) complexes have been tested in vitro against gram-positive and gram-negative bacteria in order to assess their antimicrobial properties.
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Affiliation(s)
| | - Barbara Barszcz
- Institute of Chemistry, Jan Kochanowski University in Kielce, 15G Świętokrzyska Str., 25-406 Kielce, Poland
| | - Małgorzata Zienkiewicz
- Institute of Chemistry, Jan Kochanowski University in Kielce, 15G Świętokrzyska Str., 25-406 Kielce, Poland
| | - Maciej Hodorowicz
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena Str., 30-060 Kraków, Poland
| | - Julia Jezierska
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Str., 50-383 Wrocław, Poland
| | - Katarzyna Stadnicka
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena Str., 30-060 Kraków, Poland
| | - Łukasz Lechowicz
- Microbiology Department of Institute of Biology, Jan Kochanowski University in Kielce, 15 Świętokrzyska Str., 25-406 Kielce, Poland
| | - Wiesław Kaca
- Microbiology Department of Institute of Biology, Jan Kochanowski University in Kielce, 15 Świętokrzyska Str., 25-406 Kielce, Poland
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Rich J, Manrique E, Molton F, Duboc C, Collomb MN, Rodríguez M, Romero I. Catalytic Activity of Chloro and Triflate Manganese(II) Complexes in Epoxidation Reactions: Reusable Catalytic Systems for Alkene Epoxidation. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Jana A, Aliaga-Alcalde N, Ruiz E, Mohanta S. Structures, Magnetochemistry, Spectroscopy, Theoretical Study, and Catechol Oxidase Activity of Dinuclear and Dimer-of-Dinuclear Mixed-Valence MnIIIMnII Complexes Derived from a Macrocyclic Ligand. Inorg Chem 2013; 52:7732-46. [DOI: 10.1021/ic400916h] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arpita Jana
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700
009, India
| | - Núria Aliaga-Alcalde
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
Campus de la UAB, 08193 Bellaterra, Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica and
Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, E-08028 Barcelona,
Spain
| | - Sasankasekhar Mohanta
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700
009, India
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19
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Biswas S, Saha R, Steele IM, Dey K, Kumar S. 2D Ferromagnetic sheet of antiferromagnetic trimeric metal cores. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.01.053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Retegan M, Collomb MN, Neese F, Duboc C. A combined high-field EPR and quantum chemical study on a weakly ferromagnetically coupled dinuclear Mn(iii) complex. A complete analysis of the EPR spectrum beyond the strong coupling limit. Phys Chem Chem Phys 2013; 15:223-34. [DOI: 10.1039/c2cp42955a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Ha K. Bis(acetato-κO,O')(2,2':6',2''-terpyridine-κN,N',N'')manganese(II) dihydrate. Acta Crystallogr Sect E Struct Rep Online 2012; 68:m124. [PMID: 22346811 PMCID: PMC3274864 DOI: 10.1107/s1600536811055802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 12/26/2011] [Indexed: 12/03/2022]
Abstract
The MnII ion in the title compound, [Mn(CH3CO2)2(C15H11N3)]·2H2O, is seven-coordinated in a considerably distorted pentagonal–bipyramidal geometry by three N atoms of the tridentate 2,2′:6′,2′′-terpyridine ligand and four O atoms from two acetate anions which chelate the Mn atom via two O atoms. The lateral pyridine rings are slightly inclined to the central pyridine ring, making dihedral angles of 13.6 (2) and 5.7 (2)°. The complex and solvent water molecules are linked by intermolecular O—H⋯O hydrogen bonds into a three-dimensional network.
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Affiliation(s)
- Kwang Ha
- School of Applied Chemical Engineering, The Research Institute of Catalysis, Chonnam National University, Gwangju 500-757, Republic of Korea
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22
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Roemelt M, Beckwith MA, Duboc C, Collomb MN, Neese F, DeBeer S. Manganese K-Edge X-Ray Absorption Spectroscopy as a Probe of the Metal–Ligand Interactions in Coordination Compounds. Inorg Chem 2011; 51:680-7. [DOI: 10.1021/ic202229b] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Michael Roemelt
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36,
D-45470 Mülheim an der Ruhr, Germany
| | - Martha A. Beckwith
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36,
D-45470 Mülheim an der Ruhr, Germany
- Department of Chemistry and
Chemical Biology, Cornell University, Ithaca,
New York 14853, United States
| | - Carole Duboc
- Université Joseph Fourier Grenoble 1/CNRS, Département de
Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique
Redox, Institut de Chimie Moléculaire de Grenoble FR- CNRS-2607,
BP-53, 38041 Grenoble Cedex 9, France
| | - Marie-Noëlle Collomb
- Université Joseph Fourier Grenoble 1/CNRS, Département de
Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique
Redox, Institut de Chimie Moléculaire de Grenoble FR- CNRS-2607,
BP-53, 38041 Grenoble Cedex 9, France
| | - Frank Neese
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36,
D-45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36,
D-45470 Mülheim an der Ruhr, Germany
- Department of Chemistry and
Chemical Biology, Cornell University, Ithaca,
New York 14853, United States
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23
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Romain S, Rich J, Sens C, Stoll T, Benet-Buchholz J, Llobet A, Rodriguez M, Romero I, Clérac R, Mathonière C, Duboc C, Deronzier A, Collomb MN. Multireversible Redox Processes in Pentanuclear Bis(Triple-Helical) Manganese Complexes Featuring an Oxo-Centered triangular {MnII2MnIII(μ3-O)}5+ or {MnIIMnIII2(μ3-O)}6+ Core Wrapped by Two {MnII2(bpp)3}−. Inorg Chem 2011; 50:8427-36. [DOI: 10.1021/ic201009z] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sophie Romain
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
| | - Jordi Rich
- Departament de Química, Universitat de Girona and Serveis Tecnics de Recerca, Campus de Montilivi, E-17071 Girona, Spain
| | - Cristina Sens
- Departament de Química, Universitat de Girona and Serveis Tecnics de Recerca, Campus de Montilivi, E-17071 Girona, Spain
| | - Thibaut Stoll
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
- Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, E-08193 Barcelona, Spain
| | - Montserrat Rodriguez
- Departament de Química, Universitat de Girona and Serveis Tecnics de Recerca, Campus de Montilivi, E-17071 Girona, Spain
| | - Isabel Romero
- Departament de Química, Universitat de Girona and Serveis Tecnics de Recerca, Campus de Montilivi, E-17071 Girona, Spain
| | - Rodolphe Clérac
- CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France
- Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Corine Mathonière
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France
| | - Carole Duboc
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Alain Deronzier
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Marie-Noëlle Collomb
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
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24
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Beckwith MA, Roemelt M, Collomb MN, DuBoc C, Weng TC, Bergmann U, Glatzel P, Neese F, DeBeer S. Manganese Kβ X-ray emission spectroscopy as a probe of metal-ligand interactions. Inorg Chem 2011; 50:8397-409. [PMID: 21805960 DOI: 10.1021/ic200970t] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A systematic series of high-spin mononuclear Mn(II), Mn(III), and Mn(IV) complexes has been investigated by manganese Kβ X-ray emission spectroscopy (XES). The factors contributing to the Kβ main line and the valence to core region are discussed. The Kβ main lines are dominated by 3p-3d exchange correlation (spin state) effects, shifting to lower energy upon oxidation of Mn(II) to Mn(III) due to the decrease in spin state from S = 5/2 to S = 2, whereas the valence to core region shows greater sensitivity to the chemical environment surrounding the Mn center. A density functional theory (DFT) approach has been used to calculate the valence to core spectra and assess the contributions to the energies and intensities. The valence spectra are dominated by manganese np to 1s electric dipole-allowed transitions and are particularly sensitive to spin state and ligand identity (reflected primarily in the transition energies) as well as oxidation state and metal-ligand bond lengths (reflected primarily in the transition intensities). The ability to use these methods to distinguish different ligand contributions within a heteroleptic coordination sphere is highlighted. The similarities and differences between the current Mn XES study and previous studies of Fe XES investigations are discussed. These findings serve as an important calibration for future applications to manganese active sites in biological and chemical catalysis.
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Affiliation(s)
- Martha A Beckwith
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA
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25
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Schleife F, Rodenstein A, Kirmse R, Kersting B. Seven-coordinate Mn(II) and Co(II) complexes of the pentadentate ligand 2,6-diacetyl-4-carboxymethyl-pyridine bis(benzoylhydrazone): Synthesis, crystal structure and magnetic properties. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.064] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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26
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Yu F, Li B. Bis(acetato-κO,O')[2,6-bis-(1H-pyrazol-3-yl-κN)pyridine-κN]manganese(II). Acta Crystallogr Sect E Struct Rep Online 2011; 67:m502. [PMID: 21754009 PMCID: PMC3099944 DOI: 10.1107/s1600536811010506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Accepted: 03/21/2011] [Indexed: 05/26/2023]
Abstract
In the title complex, [Mn(CH3CO2)2(C11H9N5)], the MnII atom is coordinated by the pyridine N atom and two pyrazole N atoms from a 2,6-bis(pyrazol-3-yl)pyridine ligand and four O atoms from two bidentate acetate ligands. The complex molecules are linked by intermolecular N—H⋯O hydrogen bonds into a chain along [010]. π–π interactions between the pyridine rings and between the pyrazole rings [centroid–centroid distances = 3.772 (2) and 3.546 (2) Å] connect the chains.
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27
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Stoyanova R, Barra AL, Yoncheva M, Kuzmanova E, Zhecheva E. Local structure of Mn4+ and Fe3+ spin probes in layered LiAlO2 oxide by modelling of zero-field splitting parameters. Dalton Trans 2011; 40:9106-15. [DOI: 10.1039/c1dt10929d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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