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Béres KA, Homonnay Z, Kótai L. Hexakis(urea-O)iron Complex Salts as a Versatile Material Family: Overview of Their Properties and Applications. ACS OMEGA 2024; 9:11148-11167. [PMID: 38496982 PMCID: PMC10938395 DOI: 10.1021/acsomega.3c09635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 02/12/2024] [Accepted: 02/20/2024] [Indexed: 03/19/2024]
Abstract
Due to their Fe- and N-containing reactive urea ligand content, the hexakis(urea-O)iron(II) and hexakis(urea-O)iron(III) complexes were found to be versatile materials in various application fields of industry and environmental protection. In our present work, we have comprehensively reviewed the synthesis, structural and spectroscopic details, and thermal properties of hexakis(urea-O)iron(II) and hexakis(urea-O)iron(III) salts with different anions (NO3-, Cl-, Br- I-, I3-, ClO4-, MnO4-, SO42-, Cr2O72-, and S2O82-). We compared and evaluated the structural, spectroscopic (IR, Raman, UV-vis, Mössbauer, EPR, and X-ray), and thermogravimetric data. Based on the thermal behavior of these complexes, we evaluated the solid-phase quasi-intramolecular redox reactions of anions and urea ligands in these complexes and summarized the available information on the properties of the resulting simple and mixed iron-containing oxides. Furthermore, we give a complete overview of the application of these complexes as catalysts, reagents, absorbers, or agricultural raw materials.
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Affiliation(s)
- Kende Attila Béres
- Institute
of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok krt. 2., H-1117 Budapest, Hungary
- Institute
of Chemistry, ELTE Eötvös
Loránd University, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary
| | - Zoltán Homonnay
- Institute
of Chemistry, ELTE Eötvös
Loránd University, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary
| | - László Kótai
- Institute
of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok krt. 2., H-1117 Budapest, Hungary
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2
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Kótai L, Lázár K, Kiss LF, Szentmihályi K. Reaction of Partially Methylated Polygalacturonic Acid with Iron(III) Chloride and Characterization of a New Mixed Chloride-Polygalacturonate Complex. Molecules 2024; 29:890. [PMID: 38398642 PMCID: PMC10893460 DOI: 10.3390/molecules29040890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 02/06/2024] [Accepted: 02/15/2024] [Indexed: 02/25/2024] Open
Abstract
We have described a new route for the preparation of partially methylated polygalacturonic acid containing hydrolyzed (acidic) and unhydrolyzed (methyl esterified) carboxylate groups in a ratio of 1:1 (PGA, compound 1), and one of its basic FeIII-salts (compound 2) with a ~1:2 FeIII:GA stoichiometry (GA means galacturonic acid and methylated galacturonic acid units). The partially hydrolyzed pectin was transformed into compound 1 with the use of double ion exchange with a strongly acidic macroreticular sulfonated styrene-divinylbenzene copolymer as a hydrogen ion source. The reaction of compound 1 with FeCl3 resulted in compound 2. Compound 2 has a polymeric nature and contains binuclear FeIII(µ-O)(µ-OH)FeIII core units with two kinds of distorted octahedral iron geometries. The salt-forming acidic and methylated GA units of compound 1 are coordinated to FeIII centers in asymmetric bidentate-chelating and -bridging (via C=O group and glycosidic oxygen) modes, respectively. Two kinds of outer-sphere chloride anions were also detected by XPS in various chemical environments fixed by different sets of hydrogen bonds. We also observed a partial reduction of FeIII into FeII due to the ring-opening of the chain-end GA units of compound 1. This reaction provides a new route to determine the number of chain-ends in compound 2, and with the use of the number of GA units calculated from charge neutrality, the average length of these chains and the average molecular weight were also determined. The average molecular weight of the partially methylated polygalacturonic acid used in the industrial-scale production of commercial anti-anemic iron-polygalacturonate agents was ~50,000 g/mol. Compound 2 was also characterized by IR, Mössbauer, and X-ray photoelectron spectroscopy, and magnetic susceptibility measurements. These results on the structure and average molecular weight of basic iron(III) polygalacturonate provide a tool to design Fe-PGA complexes with tuned iron-releasing properties.
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Affiliation(s)
- László Kótai
- HUN-REN Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
| | - Károly Lázár
- HUN-REN Centre for Energy Research, EKBI, Konkoly Thege Miklós Út, 29-33, H-1121 Budapest, Hungary;
| | | | - Klára Szentmihályi
- HUN-REN Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
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3
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[Hexaamminecobalt(III)] Dichloride Permanganate—Structural Features and Heat-Induced Transformations into (CoII,MnII)(CoIII,MnIII)2O4 Spinels. INORGANICS 2022. [DOI: 10.3390/inorganics10120252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We synthesized and characterized (IR, Raman, UV, SXRD) hexaamminecobalt(III) dichloride permanganate, [Co(NH3)6]Cl2(MnO4) (compound 1) as the precursor of Co–Mn–spinel composites with atomic ratios of Co:Mn = 1:1 and 1:3. The 3D−hydrogen bond network includes N–HO–Mn and N–HCl interactions responsible for solid-phase redox reactions between the permanganate anions and ammonia ligands. The temperature-limited thermal decomposition of compound 1 under the temperature of boiling toluene (110 ∘C) resulted in the formation of (NH4)4Co2Mn6O12. which contains a todorokite-like manganese oxide network (MnII4MnIII2O1210−). The heat treatment products of compounds 1 and [Co(NH3)5Cl](MnO4)2 (2) synthesized previously at 500 ∘C were a cubic and a tetragonal spinel with Co1.5Mn1.5O4 and CoMn2O4 composition, respectively. The heating of the decomposition product of compounds 1 and 2 that formed under refluxing toluene (a mixture with an atomic ratio of Co:Mn = 1:1 and 1:2) and after aqueous leaching ((NH4)4Co2Mn6O12, 1:3 Co:Mn atomic ratio in both cases) at 500 ∘C resulted in tetragonal Co0.75Mn2.25O4 spinels. The Co1.5Mn1.5O4 prepared from compound 1 at 500 ∘C during the solid-phase decomposition catalyzes the degradation of Congo red with UV light. The decomposition rate of the dye was found to be nine times faster than in the presence of the tetragonal CoMn2O4 spinel prepared in the solid-phase decomposition of compound 2. The todorokite-like intermediate prepared from compound 1 under N2 at 115 ∘C resulted in a 54 times faster degradation of Congo red, which is a great deal faster than the same todorokite-like phase that formed from compound 2 under N2.
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4
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Béres KA, Homonnay Z, Kvitek L, Dürvanger Z, Kubikova M, Harmat V, Szilágyi F, Czégény Z, Németh P, Bereczki L, Petruševski VM, Pápai M, Farkas A, Kótai L. Thermally Induced Solid-Phase Quasi-Intramolecular Redox Reactions of [Hexakis(urea- O)iron(III)] Permanganate: An Easy Reaction Route to Prepare Potential (Fe,Mn)O x Catalysts for CO 2 Hydrogenation. Inorg Chem 2022; 61:14403-14418. [PMID: 36044722 PMCID: PMC9477215 DOI: 10.1021/acs.inorgchem.2c02265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Research on new reaction routes and precursors to prepare
catalysts
for CO2 hydrogenation has enormous importance. Here, we
report on the preparation of the permanganate salt of the urea-coordinated
iron(III), [hexakis(urea-O)iron(III)]permanganate
([Fe(urea-O)6](MnO4)3) via an affordable
synthesis route and preliminarily demonstrate the catalytic activity
of its (Fe,Mn)Ox thermal decomposition
products in CO2 hydrogenation. [Fe(urea-O)6](MnO4)3 contains O-coordinated urea ligands in octahedral
propeller-like arrangement around the Fe3+ cation. There
are extended hydrogen bond interactions between the permanganate ions
and the hydrogen atoms of the urea ligands. These hydrogen bonds serve
as reaction centers and have unique roles in the solid-phase quasi-intramolecular
redox reaction of the urea ligand and the permanganate anion below
the temperature of ligand loss of the complex cation. The decomposition
mechanism of the urea ligand (ammonia elimination with the formation
of isocyanuric acid and biuret) has been clarified. In an inert atmosphere,
the final thermal decomposition product was manganese-containing wuestite,
(Fe,Mn)O, at 800 °C, whereas in ambient air, two types of bixbyite
(Fe,Mn)2O3 as well as jacobsite (Fe,Mn)T-4(Fe,Mn)OC-62O4), with overall Fe to Mn stoichiometry of 1:3, were formed. These
final products were obtained regardless of the different atmospheres
applied during thermal treatments up to 350 °C. Disordered bixbyite
formed first with inhomogeneous Fe and Mn distribution and double-size
supercell and then transformed gradually into common bixbyite with
regular structure (and with 1:3 Fe to Mn ratio) upon increasing the
temperature and heating time. The (Fe,Mn)Ox intermediates formed under various conditions showed catalytic effect
in the CO2 hydrogenation reaction with <57.6% CO2 conversions and <39.3% hydrocarbon yields. As a mild solid-phase
oxidant, hexakis(urea-O)iron(III) permanganate, was
found to be selective in the transformation of (un)substituted benzylic
alcohols into benzaldehydes and benzonitriles. [Fe(urea-O)6](MnO4)3 is a selective solid-phase oxidant
of benzylic alcohols
into benzaldehydes and precursor in the preparation of (Fe,Mn)Ox catalysts for CO2 hydrogenation
into hydrocarbons. The urea ligands are in octahedral propeller-like
arrangement around the Fe3+ cation, and there are hydrogen
bonds between the permanganate anions and the urea ligands. A solid-phase
quasi-intramolecular redox reaction of the urea and the permanganate
resulted in (Fe,Mn)O, (Fe,Mn)2O3, and (Fe,Mn)T-4(Fe,Mn)OC-62O4 with an overall Fe to Mn stoichiometry of 1:3.
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Affiliation(s)
- Kende Attila Béres
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2, H-1117 Budapest, Hungary.,György Hevesy PhD School of Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary
| | - Zoltán Homonnay
- György Hevesy PhD School of Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary
| | - Libor Kvitek
- Faculty of Science, Department of Physical Chemistry, Palacky University Olomouc, 17. Listopadu 12, Olomouc 77146, Czech Republic
| | - Zsolt Dürvanger
- Structural Chemistry and Biology Laboratory, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary
| | - Martina Kubikova
- Faculty of Science, Department of Physical Chemistry, Palacky University Olomouc, 17. Listopadu 12, Olomouc 77146, Czech Republic
| | - Veronika Harmat
- Structural Chemistry and Biology Laboratory, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary.,ELKH-ELTE Protein eModelling Research Group, Pázmány Péter s. 1/A, H-1117 Budapest, Hungary
| | - Fanni Szilágyi
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2, H-1117 Budapest, Hungary.,Bay Zoltan Ltd. for Applied Research, Production Division (BAY-PROD), 1 Kondorfa, H-1116 Budapest, Hungary
| | - Zsuzsanna Czégény
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2, H-1117 Budapest, Hungary
| | - Péter Németh
- Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, ELKH, Budaörsi street 45, H-1112 Budapest, Hungary
| | - Laura Bereczki
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2, H-1117 Budapest, Hungary
| | - Vladimir M Petruševski
- Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje MK-1000, North Macedonia
| | - Mátyás Pápai
- Wigner Research Centre for Physics, H-1525 Budapest, P.O. Box 49, Hungary
| | - Attila Farkas
- Department of Organic Chemistry, Budapest University of Technology and Economics, Műegyetem rakpart 3, H-1111 Budapest, Hungary
| | - László Kótai
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2, H-1117 Budapest, Hungary.,Deuton-X Ltd., Selmeci u. 89, H-2030, Érd, Hungary
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5
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Multi-Centered Solid-Phase Quasi-Intramolecular Redox Reactions of [(Chlorido)Pentaamminecobalt(III)] Permanganate—An Easy Route to Prepare Phase Pure CoMn2O4 Spinel. INORGANICS 2022. [DOI: 10.3390/inorganics10020018] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We synthesized and structurally characterized the previously unknown [Co(NH3)5Cl](MnO4)2 complex as the precursor of CoMn2O4. The complex was also deuterated, and its FT-IR, far-IR, low-temperature Raman and UV-VIS spectra were measured as well. The structure of the complex was solved by single-crystal X-ray diffraction and the 3D-hydrogen bonds were evaluated. The N-H…O-Mn hydrogen bonds act as redox centers to initiate a solid-phase quasi-intramolecular redox reaction even at 120 °C involving the Co(III) centers. The product is an amorphous material, which transforms into [Co(NH3)5Cl]Cl2, NH4NO3, and a todorokite-like solid Co-Mn oxide on treatment with water. The insoluble residue may contain {Mn4IIIMnIV2O12}n4n-, {Mn5IIIMnIVO12}n5n- or {MnIII6O12}n6n- frameworks, which can embed 2 × n (CoII and/or CoIII) cations in their tunnels, respectively, and 4 × n ammonia ligands are coordinated to the cobalt cations. The decomposition intermediates decompose on further heating via a series of redox reactions, forming a solid CoIIMIII2O4 spinel with an average size of 16.8 nm, and gaseous N2, N2O and Cl2. The CoMn2O4 prepared in this reaction has photocatalytic activity in Congo red degradation with UV light. Its activity strongly depends on the synthesis conditions, e.g., Congo red was degraded 9 and 13 times faster in the presence of CoMn2O4 prepared at 550 °C (in air) or 420 °C (under N2), respectively.
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6
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Bereczki L, Fogaça LA, Dürvanger Z, Harmat V, Kamarás K, Németh G, Holló BB, Petruševski VM, Bódis E, Farkas A, Szilágyi IM, Kótai L. Dynamic disorder in the high-temperature polymorph of bis[diamminesilver(I)] sulfate—reasons and consequences of simultaneous ammonia release from two different polymorphs. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1953489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Laura Bereczki
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Budapest, Hungary
- Chemical Crystallography Research Laboratory, Research Centre for Natural Sciences, ELKH, Budapest, Hungary
| | - Lara Alexandre Fogaça
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Budapest, Hungary
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, Hungary
| | - Zsolt Dürvanger
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Veronika Harmat
- Laboratory of Structural Chemistry and Biology, Institute of Chemistry, ELTE Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Protein Modelling Research Group, Budapest, Hungary
| | - Katalin Kamarás
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary
| | - Gergely Németh
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Budapest, Hungary
| | | | - Vladimir M. Petruševski
- Faculty of Natural Sciences and Mathematics, Ss. Cyryl and Methodius University, Skopje, Macedonia
| | - Eszter Bódis
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Budapest, Hungary
| | - Attila Farkas
- Organic Chemistry Department, Budapest University of Technology and Economics, Budapest, Hungary
| | - Imre Miklós Szilágyi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, Hungary
| | - László Kótai
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Budapest, Hungary
- Deuton-X Ltd, Érd, Hungary
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7
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Béres KA, Sajó IE, Lendvay G, Trif L, Petruševski VM, Barta-Holló B, Korecz L, Franguelli FP, László K, Szilágyi IM, Kótai L. Solid-Phase "Self-Hydrolysis" of [Zn(NH 3) 4MoO 4@2H 2O] Involving Enclathrated Water-An Easy Route to a Layered Basic Ammonium Zinc Molybdate Coordination Polymer. Molecules 2021; 26:4022. [PMID: 34209392 PMCID: PMC8272139 DOI: 10.3390/molecules26134022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/22/2021] [Accepted: 06/23/2021] [Indexed: 11/16/2022] Open
Abstract
An aerial humidity-induced solid-phase hydrolytic transformation of the [Zn(NH3)4]MoO4@2H2O (compound 1@2H2O) with the formation of [(NH4)xH(1-x)Zn(OH)(MoO4)]n (x = 0.92-0.94) coordination polymer (formally NH4Zn(OH)MoO4, compound 2) is described. Based on the isostructural relationship, the powder XRD indicates that the crystal lattice of compound 1@2H2O contains a hydrogen-bonded network of tetraamminezinc (2+) and molybdate (2-) ions, and there are cavities (O4N4(μ-H12) cube) occupied by the two water molecules, which stabilize the crystal structure. Several observations indicate that the water molecules have no fixed positions in the lattice voids; instead, the cavity provides a neighborhood similar to those in clathrates. The @ symbol in the notation is intended to emphasize that the H2O in this compound is enclathrated rather than being water of crystallization. Yet, signs of temperature-dependent dynamic interactions with the wall of the cages can be detected, and 1@2H2O easily releases its water content even on standing and yields compound 2. Surprisingly, hydrolysis products of 1 were observed even in the absence of aerial humidity, which suggests a unique solid-phase quasi-intramolecular hydrolysis. A mechanism involving successive substitution of the ammonia ligands by water molecules and ammonia release is proposed. An ESR study of the Cu-doped compound 2 (2#dotCu) showed that this complex consists of two different Cu2+(Zn2+) environments in the polymeric structure. Thermal decomposition of compounds 1 and 2 results in ZnMoO4 with similar specific surface area and morphology. The ZnMoO4 samples prepared from compounds 1 and 2 and compound 2 in itself are active photocatalysts in the degradation of Congo Red dye. IR, Raman, and UV studies on compounds 1@2H2O and 2 are discussed in detail.
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Affiliation(s)
- Kende Attila Béres
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - István E. Sajó
- Szentagothai Research Centre, Environmental Analytical and Geoanalytical Research Group, University of Pécs, Ifjúság Útja 20, 7624 Pécs, Hungary;
| | - György Lendvay
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - László Trif
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - Vladimir M. Petruševski
- Faculty of Natural Sciences and Mathematics, Ss. Cyryl and Methodius University, 1000 Skopje, North Macedonia;
| | - Berta Barta-Holló
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia;
| | - László Korecz
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
| | - Fernanda Paiva Franguelli
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műegyetem Rakpart 3, 1111 Budapest, Hungary;
| | - Krisztina László
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, Műegyetem Rakpart 3, 1111 Budapest, Hungary;
| | - Imre Miklós Szilágyi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műegyetem Rakpart 3, 1111 Budapest, Hungary;
| | - László Kótai
- Research Centre for Natural Sciences, Magyar Tudósok Krt 2, 1117 Budapest, Hungary; (K.A.B.); (G.L.); (L.T.); (L.K.); (F.P.F.)
- Deuton-X Ltd., Selmeci u. 89, 2030 Érd, Hungary
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8
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A Quasi-Intramolecular Solid-Phase Redox Reaction of Ammonia Ligands and Perchlorate Anion in Diamminesilver(I) Perchlorate. INORGANICS 2021. [DOI: 10.3390/inorganics9050038] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The reaction of ammoniacal AgNO3 solution (or aq. solution of [Ag(NH3)2]NO3) with aq. NaClO4 resulted in [Ag(NH3)2]ClO4 (compound 1). Detailed spectroscopic (correlation analysis, IR, Raman, and UV) analyses were performed on [Ag(NH3)2]ClO4. The temperature and enthalpy of phase change for compound 1 were determined to be 225.7 K and 103.04 kJ/mol, respectively. We found the thermal decomposition of [Ag(NH3)2]ClO4 involves a solid-phase quasi-intramolecular redox reaction between the perchlorate anion and ammonia ligand, resulting in lower valence chlorine oxyacid (chlorite, chlorate) components. We did not detect thermal ammonia loss during the formation of AgClO4. However, a redox reaction between the ammonia and perchlorate ion resulted in intermediates containing chlorate/chlorite, which disproportionated (either in the solid phase or in aqueous solutions after the dissolution of these decomposition intermediates in water) into AgCl and silver perchlorate. We propose that the solid phase AgCl-AgClO4 mixture eutectically melts, and the resulting AgClO4 decomposes in this melt into AgCl and O2. Thus, the final product of decomposition is AgCl, N2, and H2O. The intermediate (chlorite, chlorate) phases were identified by IR, XPS, and titrimetric methods.
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9
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Fogaca LA, Kováts É, Németh G, Kamarás K, Béres KA, Németh P, Petruševski V, Bereczki L, Holló BB, Sajó I, Klébert S, Farkas A, Szilágyi IM, Kótai L. Solid-Phase Quasi-Intramolecular Redox Reaction of [Ag(NH 3) 2]MnO 4: An Easy Way to Prepare Pure AgMnO 2. Inorg Chem 2021; 60:3749-3760. [PMID: 33647206 PMCID: PMC8034774 DOI: 10.1021/acs.inorgchem.0c03498] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Indexed: 11/29/2022]
Abstract
Two monoclinic polymorphs of [Ag(NH3)2]MnO4 containing a unique coordination mode of permanganate ions were prepared, and the high-temperature polymorph was used as a precursor to synthesize pure AgMnO2. The hydrogen bonds between the permanganate ions and the hydrogen atoms of ammonia were detected by IR spectroscopy and single-crystal X-ray diffraction. Under thermal decomposition, these hydrogen bonds induced a solid-phase quasi-intramolecular redox reaction between the [Ag(NH3)2]+ cation and MnO4- anion even before losing the ammonia ligand or permanganate oxygen atom. The polymorphs decomposed into finely dispersed elementary silver, amorphous MnOx compounds, and H2O, N2 and NO gases. Annealing the primary decomposition product at 573 K, the metallic silver reacted with the manganese oxides and resulted in the formation of amorphous silver manganese oxides, which started to crystallize only at 773 K and completely transformed into AgMnO2 at 873 K.
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Affiliation(s)
- Lara A. Fogaca
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Müegyetem rakpart 3, Budapest H-1111, Hungary
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Magyar Tudósok krt 2, Budapest H-1117, Hungary
| | - Éva Kováts
- Wigner
Research Centre for Physics (RCP), Institute for Solid State Physics
and Optics, Konkoly Thege u. 29−33, Budapest H-1121, Hungary
| | - Gergely Németh
- Wigner
Research Centre for Physics (RCP), Institute for Solid State Physics
and Optics, Konkoly Thege u. 29−33, Budapest H-1121, Hungary
| | - Katalin Kamarás
- Wigner
Research Centre for Physics (RCP), Institute for Solid State Physics
and Optics, Konkoly Thege u. 29−33, Budapest H-1121, Hungary
| | - Kende A. Béres
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Magyar Tudósok krt 2, Budapest H-1117, Hungary
| | - Péter Németh
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Magyar Tudósok krt 2, Budapest H-1117, Hungary
- Department
of Earth and Environmental Sciences, University
of Pannonia, Egyetem
út 10, Veszprém H-8200, Hungary
| | - Vladimir Petruševski
- Faculty
of Natural Sciences and Mathematics, Ss.
Cyril and Methodius University, Skopje 1000, Macedonia
| | - Laura Bereczki
- Chemical
Crystallography Research Laboratory, Research Centre for Natural Sciences, University of Novi Sad, Novi Sad 21000, Serbia
| | - Berta Barta Holló
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, Novi Sad 21000, Serbia
| | - István
E. Sajó
- János
Szentágothai Research Centre, University
of Pécs, Ifjúság
útja 20, Pécs H-7624, Hungary
| | - Szilvia Klébert
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Magyar Tudósok krt 2, Budapest H-1117, Hungary
| | - Attila Farkas
- Department
of Organic Chemistry, Budapest University
of Technology and Economics, Budapest H-1111, Hungary
| | - Imre M. Szilágyi
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Müegyetem rakpart 3, Budapest H-1111, Hungary
| | - László Kótai
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Magyar Tudósok krt 2, Budapest H-1117, Hungary
- Deuton-X Ltd., Selmeci
u2. 89, Érd H-2030, Hungary
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10
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Solt H, Németh P, Mohai M, Sajó IE, Klébert S, Franguelli FP, Fogaca LA, Pawar RP, Kótai L. Temperature-Limited Synthesis of Copper Manganites along the Borderline of the Amorphous/Crystalline State and Their Catalytic Activity in CO Oxidation. ACS OMEGA 2021; 6:1523-1533. [PMID: 33490812 PMCID: PMC7818585 DOI: 10.1021/acsomega.0c05301] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
Copper manganese oxides (CMO) with CuMn2O4 composition are well-known catalysts, which are widely used for the oxidative removal of dangerous chemicals, e.g., enhancing the CO to CO2 conversion. Their catalytic activity is the highest, close to those of the pre-crystalline and amorphous states. Here we show an easy way to prepare a stable CMO material at the borderline of the amorphous and crystalline state (BAC-CMO) at low temperatures (<100 °C) followed annealing at 300 °C and point out its excellent catalytic activity in CO oxidation reactions. We demonstrate that the temperature-controlled decomposition of [Cu(NH3)4](MnO4)2 in CHCl3 and CCl4 at 61 and 77 °C, respectively, gives rise to the formation of amorphous CMO and NH4NO3, which greatly influences the composition as well as the Cu valence state of the annealed CMOs. Washing with water and annealing at 300 °C result in a BAC-CMO material, whereas the direct annealing of the as-prepared product at 300 °C gives rise to crystalline CuMn2O4 (sCMO, 15-40 nm) and ((Cu,Mn)2O3, bCMO, 35-40 nm) mixture. The annealing temperature influences both the quantity and crystallite size of sCMO and bCMO products. In 0.5% CO/0.5% O2/He mixture the best CO to CO2 conversion rates were achieved at 200 °C with the BAC-CMO sample (0.011 mol CO2/(m2 h)) prepared in CCl4. The activity of this BAC-CMO at 125 °C decreases to half of its original value within 3 h and this activity is almost unchanged during another 20 h. The BAC-CMO catalyst can be regenerated without any loss in its catalytic activity, which provides the possibility for its long-term industrial application.
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Affiliation(s)
- Hanna
E. Solt
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
| | - Péter Németh
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Department
of Earth and Environmental Sciences, University
of Pannonia, Egyetem
út 10, Veszprém H-8200, Hungary
| | - Miklós Mohai
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
| | - István E. Sajó
- Szentágothai
Research Center, University of Pécs, Ifjúság útja
20, Pécs H-7624, Hungary
| | - Szilvia Klébert
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
| | - Fernanda Paiva Franguelli
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Magyarország
| | - Lara Alexandre Fogaca
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Műegyetem rakpart 3, Budapest H-1111, Magyarország
| | - Rajendra P. Pawar
- Organic
Chemistry Department, Deogiri College, Station Road, Aurangabad 431005, Maharastra, India
| | - László Kótai
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, ELKH, Magyar tudósok krt. 2, Budapest H-1117, Hungary
- Deuton-X
Ltd., Selmeci ut 89, Érd 2030, Hungary
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11
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Sajó IE, Bakos LP, Szilágyi IM, Lendvay G, Magyari J, Mohai M, Szegedi Á, Farkas A, Jánosity A, Klébert S, Kótai L. Unexpected Sequential NH 3/H 2O Solid/Gas Phase Ligand Exchange and Quasi-Intramolecular Self-Protonation Yield [NH 4Cu(OH)MoO 4], a Photocatalyst Misidentified before as (NH 4) 2Cu(MoO 4) 2. Inorg Chem 2018; 57:13679-13692. [PMID: 30351069 DOI: 10.1021/acs.inorgchem.8b02261] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[NH4Cu(OH)MoO4] as active photocatalyst in the decomposition of Congo Red when irradiated by UV or visible light has been prepared in an unusual ammonia/water ligand exchange reaction of [tetraamminecopper(II)] molybdate, [Cu(NH3)4]MoO4. [Cu(NH3)4]MoO4 was subjected to moisture of open air at room temperature. Light blue orthorhombic [Cu(NH3)(H2O)3]MoO4 was formed in 2 days as a result of an unexpected solid/gas phase ammonia-water ligand exchange reaction. This complex does not lose its last ammonia ligand on further standing in open air; however, a slow quasi-intramolecular (self)-protonation reaction takes place in 2-4 weeks, producing a yellowish-green microcrystalline material, which has been identified as a new compound, [NH4Cu(OH)MoO4], ( a = 10,5306 Å, b = 6.0871 Å, c = 8.0148 Å, β = 64,153°, C2, Z = 4). Mechanisms are proposed for both the sequential ligand exchange and the self-protonation reactions supported by ab initio quantum-chemical calculations and deuteration experiments as well. The [Cu(NH3)(H2O)3]MoO4 intermediate transforms into NH4Cu(OH)(H2O)2MoO4, which loses two waters and yields [NH4Cu(OH)MoO4]. Upon heating, both [Cu(NH3)4]MoO4 and [Cu(NH3)(H2O)3]MoO4 decompose, losing three NH3 and three H2O ligands, respectively, and stable [Cu(NH3)MoO4] is formed from both. The latter can partially be hydrated in boiling water into [NH4Cu(OH)MoO4. This compound can also be prepared in pure form by boiling the saturated aqueous solution of [Cu(NH3)4]MoO4. All properties of [NH4Cu(OH)MoO4] match those of the active photocatalyst described earlier in the literature under the formulas (NH4)2[Cu(MoO4)2] and (NH4)2Cu4(NH3)3Mo5O20.
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Affiliation(s)
- István E Sajó
- University of Pécs , János Szentágothai Research Centre , Pécs , H-7624 , Hungary
| | - László P Bakos
- Budapest University of Technology and Economics , Department of Inorganic and Analytical Chemistry , Müegyetem rakpart 3 , Budapest , H-1111 , Hungary
| | - Imre M Szilágyi
- Budapest University of Technology and Economics , Department of Inorganic and Analytical Chemistry , Müegyetem rakpart 3 , Budapest , H-1111 , Hungary
| | - György Lendvay
- Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar Tudósok krt. 2 , Budapest , H-1519 , Hungary
| | - József Magyari
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences , University of Novi Sad , Trg Dositeja Obradovića 3 , Novi Sad , 21000 , Serbia
| | - Miklós Mohai
- Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar Tudósok krt. 2 , Budapest , H-1519 , Hungary
| | - Ágnes Szegedi
- Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar Tudósok krt. 2 , Budapest , H-1519 , Hungary
| | - Attila Farkas
- Budapest University of Technology and Economics , Department of Organic Chemistry , Müegyetem rakpart 3 , Budapest , H-1111 , Hungary
| | - Anna Jánosity
- Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar Tudósok krt. 2 , Budapest , H-1519 , Hungary
| | - Szilvia Klébert
- Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar Tudósok krt. 2 , Budapest , H-1519 , Hungary
| | - László Kótai
- Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar Tudósok krt. 2 , Budapest , H-1519 , Hungary.,Deuton-X Ltd. , H-2030 , Érd , Selmeci u. 89, Hungary
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12
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Hetmańczyk Ł, Hetmańczyk J. Phase transition, thermal dissociation and dynamics of NH3 ligands in [Cd(NH3)4](ReO4)2. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 164:24-32. [PMID: 27070528 DOI: 10.1016/j.saa.2016.03.045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 03/09/2016] [Accepted: 03/27/2016] [Indexed: 06/05/2023]
Abstract
High temperature phase transition in [Cd(NH3)4](ReO4)2 at Tc=368.5K (on heating) was reported for the first time. Thermal stability was investigated by thermal analysis methods. The titled compound decomposes in three main stages. The first two are connected with deamination process whereas in the last step Re2O7 evaporates. The activation energy for NH3 lost processes was estimated from TG measurements. The dynamics of NH3 ligands in the low temperature phase was probed by various complementary techniques. Temperature dependent band shape analysis of properly chosen infrared and Raman scattering vibrational bands was performed. It was found that activation energy for NH3 reorientational motion (below 300K) is rather small and is equal to ca. 4kJmol(-1). The quasielastic neutron scattering measurements revealed that NH3 groups perform fast stochastic reorientational motion even in the low temperatures. The neutron and X-ray powder diffraction data do not revealed any drastic changes in the crystal structure in the wide temperature range.
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Affiliation(s)
- Łukasz Hetmańczyk
- Jagiellonian University, Faculty of Chemistry Department of Chemical Physics, Ingardena 3, 30-060 Cracow, Poland; Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, 141980 Dubna, Russian Federation.
| | - Joanna Hetmańczyk
- Jagiellonian University, Faculty of Chemistry Department of Chemical Physics, Ingardena 3, 30-060 Cracow, Poland; Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, 141980 Dubna, Russian Federation
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13
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Kótai L, Sajó IE, Jakab E, Keresztury G, Németh C, Gács I, Menyhárd A, Kristóf J, Hajba L, Petrusevski VM, Ivanovski V, Timpu D, Sharma PK. Studies on the Chemistry of [Cd(NH3)4](MnO4)2. A Low Temperature Synthesis Route of the CdMn2O4+xType NOxand CH3SH Sensor Precursors. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100467] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Venediktov AB, Vasilchenko DB, Yushina IV, Nedoseykina TI, Filatov EY, Korenev SV. Solid-phase room-temperature decomposition of a complex salt trans-[Rh(γ-Pic)4Cl2]MnO4. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.01.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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