TY - JOUR AU - Béres, Kende Attila AU - Dürvanger, Zsolt AU - Homonnay, Zoltán AU - Nagyné Bereczki, Laura AU - Barta Holló, Berta AU - Farkas, Attila AU - Petruševski, Vladimir M. AU - Kótai, László TI - Insight into the Structure and Redox Chemistry of [Carbonatotetraamminecobalt(III)] Permanganate and Its Monohydrate as Co-Mn-Oxide Catalyst Precursors of the Fischer-Tropsch Synthesis JF - INORGANICS J2 - INORGANICS VL - 12 PY - 2024 IS - 4 SP - 94 SN - 2304-6740 DO - 10.3390/inorganics12040094 UR - https://m2.mtmt.hu/api/publication/34753165 ID - 34753165 AB - [Carbonatotetraamminecobalt(III)] permanganate monohydrate was synthesized first in the metathesis reaction of [Co(NH3)4CO3]NO3 and NaMnO4 in aqueous solution. Its thermal dehydration at 100 °C resulted in phase-pure [Co(NH3)4CO3]MnO4 (compound 1). Compounds 1 and 2 (i.e., the hydrated form) were studied with IR, far-IR, and low-temperature Raman spectroscopies, and their vibrational modes were assigned. The lattice parameters were determined by powder X-ray diffraction (PXRD) and single crystal X-ray diffraction (SXRD) methods for the triclinic and orthorhombic compounds 1 and 2, respectively. The detailed structure of compound 2 was determined, and the role of hydrogen bonds in the structural motifs was clarified. UV studies on compounds 1 and 2 showed the distortion of the octahedral geometry of the complex cation during dehydration because of the partial loss of the hydrogen bonds between the crystal water and the ligands of the complex cation. The thermal decomposition consists of a solid phase quasi-intramolecular redox reaction between the ammonia ligands and permanganate anions with the formation of ammonia oxidation products (H2O, NO, N2O, and CO2). The solid phase reaction product is amorphous cobalt manganese oxide containing ammonium, carbonate (and nitrate) anions. The temperature-controlled thermal decomposition of compound 2 in toluene at 110 °C showed that one of the decomposition intermediates is ammonium nitrate. The decomposition intermediates are transformed into Co1.5Mn1.5O4 spinel with MnCo2O4 structure upon further heating. Solid compound 2 gave the spinel at 500 °C both in an inert and air atmosphere, whereas the sample pre-treated in toluene at 110 °C without and with the removal of ammonium nitrate by aqueous washing, gave the spinel already at 300 and 400 °C, respectively. The molten NH4NO3 is a medium to start spinel crystallization, but its decomposition stops further crystal growth of the spinel phase. By this procedure, the particle size of the spinel product as low as ~4.0 nm could be achieved for the treatments at 300 and 400 °C, and it increased only to 5.7 nm at 500 °C. The nano-sized mixed cobalt manganese oxides are potential candidates as Fischer-Tropsch catalysts. LA - English DB - MTMT ER - TY - JOUR AU - Béres, Kende Attila AU - Homonnay, Zoltán AU - Kótai, László TI - Hexakis(urea-O)iron Complex Salts as a Versatile Material Family: Overview of Their Properties and Applications JF - ACS OMEGA J2 - ACS OMEGA VL - 9 PY - 2024 IS - 10 SP - 11148 EP - 11167 PG - 20 SN - 2470-1343 DO - 10.1021/acsomega.3c09635 UR - https://m2.mtmt.hu/api/publication/34718662 ID - 34718662 N1 - Institute of Materials and Environmental Chemistry, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok krt. 2., Budapest, H-1117, Hungary Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter s. 1/A, Budapest, H-1117, Hungary Export Date: 19 March 2024 Correspondence Address: Béres, K.A.; Institute of Materials and Environmental Chemistry, Magyar Tudósok krt. 2., Hungary; email: beres.kende.attila@ttk.hu Correspondence Address: Kótai, L.; Institute of Materials and Environmental Chemistry, Magyar Tudósok krt. 2., Hungary; email: kotai.laszlo@ttk.hu LA - English DB - MTMT ER - TY - JOUR AU - Alenkina, Irina V. AU - Chukin, Andrey V. AU - Leitus, Gregory AU - Denisova, Olga V. AU - Gracheva, Maria AU - Felner, Israel AU - Kuzmann, Ernő AU - Homonnay, Zoltán AU - Oshtrakh, Michael I. TI - ANALYSIS OF THE IRON STATES IN IRON-CONTAINING PHARMACEUTICAL PRODUCTS USING MÖSSBAUER SPECTROSCOPY JF - JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS J2 - J PHARMACEUT BIOMED ANAL VL - 237 PY - 2024 SN - 0731-7085 DO - 10.1016/j.jpba.2023.115745 UR - https://m2.mtmt.hu/api/publication/34160976 ID - 34160976 N1 - Institute of Physics and Technology, Ural Federal University, Ekaterinburg, 620002, Russian Federation Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel Laboratory of Nuclear Chemistry, Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary Hevesy Gyorgy Doctoral School of Chemistry, Eötvös Loránd University, Budapest, Hungary Racah Institute of Physics, The Hebrew University, Jerusalem, 91904, Israel Export Date: 16 November 2023 CODEN: JPBAD Correspondence Address: Oshtrakh, M.I.; Institute of Physics and Technology, Russian Federation; email: oshtrakh@gmail.com LA - English DB - MTMT ER - TY - CONF AU - Béres, Kende Attila TI - Különféle ligandumokat és anionokat tartalmazó ezüst(I)- és kobalt(III)-komplexsók szintézise, szerkezete és tulajdonsága T2 - Intézményi ÚNKP konferencia PB - Eötvös Loránd Tudományegyetem (ELTE) PY - 2023 SP - 120 UR - https://m2.mtmt.hu/api/publication/34572950 ID - 34572950 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Oshtrakh, Michael I. AU - Alenkina, Irina V. AU - Chukin, Andrey V. AU - Kuzmann, Ernő AU - Homonnay, Zoltán TI - Comparison of two pharmaceutical products containing ferrous sulfate using Mössbauer spectroscopy JF - HYPERFINE INTERACTIONS J2 - HYPERFINE INTERACT VL - 244 PY - 2023 IS - 1 SN - 0304-3843 DO - 10.1007/s10751-023-01835-4 UR - https://m2.mtmt.hu/api/publication/34323900 ID - 34323900 LA - English DB - MTMT ER - TY - JOUR AU - Barta Holló, Berta AU - Bayat, Niloofar AU - Nagyné Bereczki, Laura AU - Petrusevski, Vladimir AU - Béres, Kende Attila AU - Farkas, Attila AU - Szilágyi, Imre Miklós AU - Kótai, László TI - Spectroscopic and structural characterization of hexaamminecobalt(III) dibromide permanganate JF - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY J2 - J SERB CHEM SOC VL - 88 PY - 2023 IS - 12 SP - 1237 EP - 1252 PG - 16 SN - 0352-5139 DO - 10.2298/JSC230702062B UR - https://m2.mtmt.hu/api/publication/34316828 ID - 34316828 N1 - Export Date: 23 February 2024 CODEN: JSCSE Correspondence Address: Kótai, L.; Institute of Materials and Environmental Chemistry, Magyar Tudósok krt. 2., Hungary; email: kotai.laszlo@ttk.hu AB - Structural and spectroscopic characterization (SXRD, IR, liq. N2 temperature Raman, UV) of hexaamminecobalt(III) dibromide permanganate, [Co(NH3)6]Br2(MnO4) (compound 1) are described. There is a 3D hydrogen bond network including N-H???O-Mn and N-H???Br interactions, which could serve as potential reaction centers for solid-phase redox reactions between the ammonia ligands and/or bromide ions as reductants and permanganate ions as oxidant agents. The effect of the nature of halogen ions on the structural and spectroscopic properties of [Co(NH3)6]Br2(MnO4) and the analogous chloride compound, [Co(NH3)6]Cl2(MnO4) (compound 2) are discussed in detail. LA - English DB - MTMT ER - TY - JOUR AU - Oshtrakh, Michael I. AU - Kuzmann, Ernő AU - Homonnay, Zoltán AU - Semionkin, Vladimir A. TI - Analysis of the differential nonlinearity for the velocity driving systems in Mössbauer spectrometers using thin α-Fe reference absorber JF - HYPERFINE INTERACTIONS J2 - HYPERFINE INTERACT VL - 244 PY - 2023 IS - 1 SN - 0304-3843 DO - 10.1007/s10751-023-01831-8 UR - https://m2.mtmt.hu/api/publication/34266835 ID - 34266835 LA - English DB - MTMT ER - TY - JOUR AU - Tóbi, Csaba AU - Homonnay, Zoltán AU - Süvegh, Károly TI - A possible novel method in nuclear forensics: positron annihilation spectroscopy JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY- LETTERS J2 - J RADIOANAL NUCL CH LE (1984-1996) VL - 332 PY - 2023 IS - 7 SP - 2741 EP - 2747 PG - 7 SN - 0236-5731 DO - 10.1007/s10967-023-08926-0 UR - https://m2.mtmt.hu/api/publication/34189382 ID - 34189382 LA - English DB - MTMT ER - TY - JOUR AU - Goryunov, M. V. AU - Varga, G. AU - Dankházi, Zoltán AU - Chukin, A. V. AU - Felner, I. AU - Kuzmann, Ernő AU - Grokhovsky, V. I. AU - Homonnay, Zoltán AU - Oshtrakh, M. I. TI - Characterization of iron meteorites by scanning electron microscopy, x-ray diffraction, magnetization measurements, and Mossbauer spectroscopy: Mundrabilla IAB-ung JF - METEORITICS & PLANETARY SCIENCE J2 - METEORIT PLANET SCI VL - 58 PY - 2023 IS - 10 SP - 1552 EP - 1562 PG - 11 SN - 1086-9379 DO - 10.1111/maps.14070 UR - https://m2.mtmt.hu/api/publication/34181984 ID - 34181984 N1 - Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian Federation Department of Materials Physics, Eötvös Loránd University, Budapest, Hungary Racah Institute of Physics, The Hebrew University, Jerusalem, Israel Laboratory of Nuclear Chemistry, Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary Cited By :1 Export Date: 20 February 2024 CODEN: MPSCF Correspondence Address: Oshtrakh, M.I.; Institute of Physics and Technology, Russian Federation; email: oshtrakh@gmail.com AB - A fragment of Mundrabilla IAB-ung iron meteorite was analyzed using optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), magnetization measurements, and Mossbauer spectroscopy. The polished section of meteorite fragment characterization by optical microscopy and SEM shows the presence of the gamma-Fe(Ni, Co) phase lamellae, plessite structures and schreibersite inclusions in the alpha-Fe(Ni, Co) phase. EDS indicates variations in the Ni concentrations in the following ranges: (i) similar to 6.3-6.5 atom% in the alpha-Fe(Ni, Co) phase and (ii) similar to 22 to similar to 45 atom% in the gamma-Fe(Ni, Co) phase lamellae including the range of similar to 29-33 atom% of Ni leading to the paramagnetic state of the gamma-Fe(Ni, Co) phase. Schreibersite inclusions contain similar to 23 atom% of P, similar to 33 atom% of Fe, similar to 43 atom% of Ni, and similar to 0.7 atom% of Co. Plessite structure contains the average Ni concentration of similar to 17 atom% while detailed EDS analysis shows: (i) the lowest Ni concentrations of similar to 5 to similar to 8 atom%, (ii) the intermediate Ni concentrations of similar to 9 to similar to 19 atom%, and (iii) the highest Ni concentration up similar to 38 atom% (some individual micro-grains demonstrate up to similar to 47 and similar to 59 atom% of Ni) that may indicate the presence of the (i) alpha-Fe(Ni, Co), (ii) alpha(2)-Fe(Ni, Co), and (iii) gamma-Fe(Ni, Co) phases. These may be a result of the c-phase decomposition with mechanism gamma -> alpha + alpha(2) + gamma that indicates a slow cooling rate for Mundrabilla IAB-ung iron meteorite. The presence of similar to 98.6 wt% of the alpha-Fe(Ni, Co) phase and similar to 1.4 wt% of the gamma-Fe(Ni, Co) phase is found by XRD while schreibersite is not detected. Magnetization measurements show the saturation magnetization moment of Mundrabilla IAB-ung of 188(2) emu g(-1) indicating a low average Ni concentration in Fe-Ni-Co alloy. Mossbauer spectrum of the bulk Mundrabilla powder demonstrates five magnetic sextets related to the ferromagnetic alpha(2)-Fe(Ni, Co), alpha-Fe(Ni, Co), and gamma-Fe(Ni, Co) phases and one singlet associated with the paramagnetic gamma-Fe(Ni, Co) phase, however, there are no spectral components corresponding to schreibersite. Basing on relatively larger and smaller values of the magnetic hyperfine field, two magnetic sextets associated with gamma-Fe(Ni, Co) phase can be related to the disordered and more ordered gamma-phases. The iron fractions in the detected phases can be roughly estimated as follows: (i) similar to 17.6% in the alpha(2)-Fe(Ni, Co) phase, (ii) similar to 68.5% in the alpha-Fe(Ni, Co) phase, (iii) similar to 11.5% in the disordered gamma-Fe(Ni, Co) phase, (iv) similar to 2.0% in the more ordered gamma-Fe(Ni, Co) phase, and (v) similar to 0.4% in the paramagnetic gamma-Fe(Ni, Co) phase. LA - English DB - MTMT ER - TY - JOUR AU - Várhelyi, Csaba, ifj. AU - Szőke, Á. AU - Sziráki, Laura AU - Tomoaia-Cotișel, M. AU - Homonnay, Zoltán AU - Szalay, Roland AU - Simon-Várhelyi, M. AU - Mereu, R.-A. AU - Pokol, György AU - Szilágyi, Imre Miklós AU - Papp, J. AU - Mihály, Judith AU - Kuzmann, Ernő TI - Fe spin states and redox processes in Schiff base type complexes JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY J2 - J RADIOANAL NUCL CHEM VL - 332 PY - 2023 IS - 10 SP - 4125 EP - 4139 PG - 15 SN - 0236-5731 DO - 10.1007/s10967-023-09095-w UR - https://m2.mtmt.hu/api/publication/34107401 ID - 34107401 N1 - Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Arany János 11, Cluj-Napoca, 400028, Romania Institute of Chemistry, Eötvös Loránd University, Pázmány Péter 1/a, Budapest, 1117, Hungary Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem Rkp. 3, Budapest, 1111, Hungary Faculty of Biology and Geology, Babeş-Bolyai University, Gheorghe Bilaşcu 44, Cluj-Napoca, 400015, Romania Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Budapest, 1117, Hungary Export Date: 29 January 2024 CODEN: JRNCD Correspondence Address: Várhelyi, C.; Faculty of Chemistry and Chemical Engineering, Arany János 11, Romania; email: csaba.varhelyi@ubbcluj.ro LA - English DB - MTMT ER -