Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition
Boehmite samples with compounds of the composition (C5H5)2FeMnX2(μ-CO)n, where X=Cl, Br and n=1.2, precipitated at room temperature from tetrahydrofuran solutions and then heated in an air flow up to 873 K were obtained and characterized using X-ray diffractometry, infrared Fourier spectroscopy, el...
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al-Farabi Kazakh National University
2024-10-01
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| Series: | Eurasian Chemico-Technological Journal |
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| Online Access: | https://ect-journal.kz/index.php/ectj/article/view/1639 |
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| author | A.I. Rustamova R.M. Muradxanov S.N. Osmanova F.K. Pashayeva A.N. Mammadov D.B. Tagiyev E.H. Ismailov |
| author_facet | A.I. Rustamova R.M. Muradxanov S.N. Osmanova F.K. Pashayeva A.N. Mammadov D.B. Tagiyev E.H. Ismailov |
| author_sort | A.I. Rustamova |
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Boehmite samples with compounds of the composition (C5H5)2FeMnX2(μ-CO)n, where X=Cl, Br and n=1.2, precipitated at room temperature from tetrahydrofuran solutions and then heated in an air flow up to 873 K were obtained and characterized using X-ray diffractometry, infrared Fourier spectroscopy, electron magnetic resonance and temperature-programmed desorption methods. It was shown that the thermal decomposition of these compounds applied to the boehmite samples in the range from room temperature to 873 K occurs stepwise and consists of at least two stages. The first stage of thermal decomposition occurs in the range of 453–753 K, and the second – in the range of 813–843 K. The XRD data show that when calcining at 873 K the boehmite samples with the applied compounds of the above composition and containing these compounds less than 10 wt.%, the diffraction patterns show only reflections characteristic of poorly crystallized aluminum oxide. However, the electron paramagnetic resonance (EPR) spectra of these samples clearly show intense signals characteristic of superpara/ferromagnetic particles of iron and manganese oxides, as well as EPR signals from isolated Fe3+ substituting Al3+ ions in the aluminum oxide structure. EPR spectra most of the iron and manganese is stabilized on the surface of poorly crystallized aluminum oxide in the form of nanostructured iron and manganese oxides.
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| format | Article |
| id | doaj-art-c260ca0585a74a3282d1d1c396854729 |
| institution | Kabale University |
| issn | 1562-3920 2522-4867 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | al-Farabi Kazakh National University |
| record_format | Article |
| series | Eurasian Chemico-Technological Journal |
| spelling | doaj-art-c260ca0585a74a3282d1d1c3968547292025-01-29T15:42:09Zengal-Farabi Kazakh National UniversityEurasian Chemico-Technological Journal1562-39202522-48672024-10-0126310.18321/ectj1639Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their DecompositionA.I. Rustamova0R.M. Muradxanov1S.N. Osmanova2F.K. Pashayeva3A.N. Mammadov4D.B. Tagiyev5E.H. Ismailov6Institute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan Institute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan Institute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan; Khazar University, 41 Mahsati Str., AZ1096, Baku, AzerbaijanInstitute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan Institute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan; Azerbaijan Technical University, H. Javid Ave. 25, AZ1073 Baku, AzerbaijanInstitute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan Institute of Catalysis and Inorganic Chemistry, 113, H. Javid, AZ1143, Baku, Azerbaijan Boehmite samples with compounds of the composition (C5H5)2FeMnX2(μ-CO)n, where X=Cl, Br and n=1.2, precipitated at room temperature from tetrahydrofuran solutions and then heated in an air flow up to 873 K were obtained and characterized using X-ray diffractometry, infrared Fourier spectroscopy, electron magnetic resonance and temperature-programmed desorption methods. It was shown that the thermal decomposition of these compounds applied to the boehmite samples in the range from room temperature to 873 K occurs stepwise and consists of at least two stages. The first stage of thermal decomposition occurs in the range of 453–753 K, and the second – in the range of 813–843 K. The XRD data show that when calcining at 873 K the boehmite samples with the applied compounds of the above composition and containing these compounds less than 10 wt.%, the diffraction patterns show only reflections characteristic of poorly crystallized aluminum oxide. However, the electron paramagnetic resonance (EPR) spectra of these samples clearly show intense signals characteristic of superpara/ferromagnetic particles of iron and manganese oxides, as well as EPR signals from isolated Fe3+ substituting Al3+ ions in the aluminum oxide structure. EPR spectra most of the iron and manganese is stabilized on the surface of poorly crystallized aluminum oxide in the form of nanostructured iron and manganese oxides. https://ect-journal.kz/index.php/ectj/article/view/1639supported Fe-Ni cyclopentadienyl complexes, boehmite, thermal decomposition |
| spellingShingle | A.I. Rustamova R.M. Muradxanov S.N. Osmanova F.K. Pashayeva A.N. Mammadov D.B. Tagiyev E.H. Ismailov Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition Eurasian Chemico-Technological Journal supported Fe-Ni cyclopentadienyl complexes, boehmite, thermal decomposition |
| title | Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition |
| title_full | Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition |
| title_fullStr | Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition |
| title_full_unstemmed | Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition |
| title_short | Heteronuclear Fe-Mn Cyclopentadienyl Complexes Supported on Boehmite. Thermochemistry and Thermodynamics of their Decomposition |
| title_sort | heteronuclear fe mn cyclopentadienyl complexes supported on boehmite thermochemistry and thermodynamics of their decomposition |
| topic | supported Fe-Ni cyclopentadienyl complexes, boehmite, thermal decomposition |
| url | https://ect-journal.kz/index.php/ectj/article/view/1639 |
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