TY - JOUR AU - Bánhegyi, Dorottya Fruzsina AU - Madarász, János AU - Fogassy, Elemér AU - Pálovics, Emese Csilla AU - Pokol, György TI - Crystalline Forms of 4,4'-Methylenediantipyrine: Crystallographic Unit Cell for the Anhydrous Form, from Laboratory Powder XRD Pattern by DASH Program Package JF - PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING J2 - PERIOD POLYTECH CHEM ENG VL - 67 PY - 2023 IS - 4 SP - 557 EP - 564 PG - 8 SN - 0324-5853 DO - 10.3311/PPch.22950 UR - https://m2.mtmt.hu/api/publication/34204776 ID - 34204776 N1 - Funding Agency and Grant Number: National Research, Development and Innovation Office-NKFIH through OTKA [124180, FK138475, 146218] Funding text: E.F. and E.P. are grateful for the past and future support of the National Research, Development and Innovation Office-NKFIH through OTKA grant Nos. 124180 and FK138475 and 146218, respectively. The authors are also grateful to Mr. David Susko for his substantial help in the preparative work. AB - Crystalline unit cell structure of anhydrous title compound, diantipyrinylmethane (CAS Registry No. 1251-85-0), a substance usually obtained as a by-product in Mannich type reactions of antipyrine, has been modelled by the help of powder X-ray diffraction, applying the DASH software package and crystal coordinates coming from former single crystal X-ray structure determinations (CSD codes FADDIY and FADDIY01) of its monohydrate. The unit cell of the anhydrate compound belongs to the monoclinic space group P21/a, with unit cell parameters of a = 14.604, b = 9.858, c = 14.509 Å, β = 95.56 °, V = 2078.9 Å3, Z = 4, Z ' = 1. Comparisons of FT-IR spectrum and thermal behavior of the anhydrous and monohydrated forms confirm differences in degree of hydration and solid state structure, while those of 1H- and 13C NMR-spectra show their molecular identity. 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 - TY - JOUR AU - Pálovics, Emese Csilla AU - Madarász, János AU - Pokol, György AU - Fogassy, Elemér AU - Bánhegyi, Dorottya Fruzsina TI - Economic Separations of Organic Acidic or Basic Enantiomeric Mixtures—A Protocol Suggestion JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 24 PY - 2023 IS - 1 PG - 23 SN - 1661-6596 DO - 10.3390/ijms24010846 UR - https://m2.mtmt.hu/api/publication/33543852 ID - 33543852 N1 - Funding Agency and Grant Number: National Research, Development and Innovation Office-NKFIH [FK138475] Funding text: This research was funded by the National Research, Development and Innovation Office-NKFIH, Grant/Award Number: FK138475. AB - In this review, we aim to present new concepts for the revisited separation of enantiomers from racemic compounds and a protocol worth to be followed in designing the preparation of pure enantiomers. We have taken into account not only the influence of the properties (eutectic composition) and characteristics of the reactants (racemic compound, resolving agent), but also the behavior of the resulting diastereomers and the different conditions (e.g., crystallization time, solvents used, solvate-forming compounds, achiral additives, etc.). The examples discussed are resolutions developed by our research team, through which we will try to illustrate the impact of all these considerations, presenting the methodological investigations interpreting recent discoveries and observations. Some special solid-state analytical and structural investigations assisting us in the elucidation and invention design of the resolution processes of some active pharmaceutical ingredients, such as Tetramisole, tofisopam, and Amlodipine, are also shown. LA - English DB - MTMT ER - TY - CONF AU - Várhelyi, Csaba, ifj. AU - Pokol, György AU - Szalay, Roland AU - MEREU, RALUCA-ANCA AU - Simon-Várhelyi, Melinda AU - Tötös, Róbert AU - Madarász, János AU - PAPP, JUDIT AU - Mihály, Judith TI - Szemi- és tioszemikarbazonokkal képzett platina- és nikkel-komplexek előállítása, valamint fizikai-kémiai és biológiai vizsgálatuk (Pt- and Ni-complexes Syntheses with Semi- and Thiosemicarbazones, and their Physical-Chemical and Biological Study) T2 - A Magyar Tudomány Napja Erdélyben 2022: Tudomány: út a világ megismeréséhez PY - 2022 SP - 28 EP - 30 PG - 3 UR - https://m2.mtmt.hu/api/publication/33646163 ID - 33646163 N1 - EME – Természettudományi szakosztály LA - Hungarian DB - MTMT ER - TY - CHAP AU - Várhelyi, Csaba, ifj. AU - Szalay, Roland AU - Pokol, György AU - Madarász, János AU - Szilágyi, Imre Miklós AU - Huszthy, Péter AU - Simon-Várhelyi, Melinda AU - Tötös, Róbert AU - RALUCA-ANCA, MEREU AU - ALEXANDRA, AVRAM AU - Korecz, László AU - May, Nóra Veronika AU - Mihály, Judith ED - Alapi, Tünde ED - Berkecz, Róbert ED - Ilisz, István TI - Novel Copper Complexes with Glyoximes, Amines, Schiff Bases, Semi- and Thiosemicarbazones; Synthesis and Physico-Chemical Analysis T2 - Proceedings of the 28th International Symposium on Analytical and Environmental Problems PB - University of Szeged CY - Szeged SN - 9789633069042 PY - 2022 SP - 46 EP - 50 PG - 5 UR - https://m2.mtmt.hu/api/publication/33645223 ID - 33645223 LA - English DB - MTMT ER - TY - CONF AU - Várhelyi, Csaba, ifj. AU - Szalay, Roland AU - Kuzmann, Ernő AU - Homonnay, Zoltán AU - Pokol, György AU - Madarász, János AU - PAPP, JUDIT AU - MEREU, RALUCA-ANCA AU - Huszthy, Péter AU - Simon-Várhelyi, Melinda AU - AVRAM, ALEXANDRA AU - Mihály, Judith ED - Majdik, Cornelia TI - Glioximokkal, aminokkal, bórsav-észterekkel és Schiff-bázisokkal képzett új vas(II)-komplexek fizikai-kémiai elemzése, és biológiai tulajdonságainak vizsgálata (Novel Iron(II) Complexes with Glyoximes, Amines, Borate Esters and Schiff-Bases, their Physico-Chemical Analysis and Biological Properties Study) T2 - XXVIII. Nemzetközi Vegyészkonferencia = 28th International Conference on Chemistry PB - Erdélyi Magyar Műszaki Tudományos Társaság (EMT) C1 - Kolozsvár T3 - Nemzetközi Vegyészkonferencia, ISSN 1843-6293 PY - 2022 SP - 44 EP - 44 PG - 1 UR - https://m2.mtmt.hu/api/publication/33645214 ID - 33645214 N1 - EMT, XXVIII. Nemzetközi Vegyészkonferencia, 2022. okt. 27 – 29., Nagyvárad LA - Hungarian DB - MTMT ER - TY - JOUR AU - Várhelyi, Csaba, ifj. AU - Szalay, Roland AU - Pokol, György AU - Madarász, János AU - Marincaș , Laura AU - MEREU, Raluca-Anca AU - Mihály, Judith AU - PAPP, Judit AU - Simon-Várhelyi, Melinda AU - Tötös, Róbert AU - TOMOAIA- COTIŞEL, Maria TI - Synthesis of Pt(II)-complexes with symmetrical and unsymmetrical glyoximes, their physical-chemical and biological study JF - STUDIA UNIVERSITATIS BABES-BOLYAI CHEMIA J2 - STUD UNIV BABES-BOLYAI CHEM VL - 67 PY - 2022 IS - 4 SP - 315 EP - 335 PG - 21 SN - 1224-7154 DO - 10.24193/subbchem.2022.4.21 UR - https://m2.mtmt.hu/api/publication/33645156 ID - 33645156 N1 - Funding Agency and Grant Number: "Domus Hungarica Foundation" of Hungary Funding text: The authors wish to express their thankfulness to the "Domus Hungarica Foundation" of Hungary for the several fellowships provided to Csaba Varhelyi jr. LA - English DB - MTMT ER - TY - JOUR AU - Várhelyi, Csaba, ifj. AU - Pokol, György AU - Szalay, Roland AU - F., GOGA AU - Simon-Várhelyi, Melinda AU - L.-M., GOLBAN AU - A., BOGDAN AU - Huszthy, Péter AU - Madarász, János AU - J., PAPP AU - J.-N., BÁLINT-TROMBITÁS AU - Mihály, Judith TI - Platina-komplexek szintézise aminokkal, alfa-dioximokkal, Schiff-bázisokkal, valamint fizikai-kémiai és biológiai sajátosságainak vizsgálata (Platinum Complexes Synthesis with Amines, alpha-dioximes, Schiff bases and their Physical-Chemical and Biological Study) JF - ACTA SCIENTIARUM TRANSYLVANICA - MÚZEUMI FÜZETEK (2006-) J2 - ACTA SCI TRANSYLVANICA VL - 28 (2020) PY - 2022 IS - 3 SP - 5 EP - 18 PG - 14 SN - 1842-5070 UR - https://m2.mtmt.hu/api/publication/33644922 ID - 33644922 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Várhelyi, Csaba, ifj. AU - Homonnay, Zoltán AU - Szalay, Roland AU - Pokol, György AU - Szilágyi, Imre Miklós AU - Huszthy, Péter AU - KUBUKI, Shiro AU - GOGA, Firuța AU - Tötös, Róbert AU - Simon-Várhelyi, Melinda AU - Kuzmann, Ernő TI - Mössbauer study of some novel iron-bis-glyoxime and iron-tris-glyoxime complexes JF - HYPERFINE INTERACTIONS J2 - HYPERFINE INTERACT VL - 243 PY - 2022 IS - 1 SN - 0304-3843 DO - 10.1007/s10751-021-01738-2 UR - https://m2.mtmt.hu/api/publication/32561115 ID - 32561115 N1 - Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, Cluj, Romania Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary Budapest University of Technology and Economics, Budapest, Hungary Department of Chemistry, Tokyo Metropolitan University, Tokyo, Japan Export Date: 29 April 2022 CODEN: HYIND Correspondence Address: Kuzmann, E.; Institute of Chemistry, Hungary; email: erno.kuzmann@ttk.elte.hu Funding Agency and Grant Number: National Research, Development and Innovation Office - NKFIH/OTKA [K67835, K68135, K115913]; "Domus Hungarica Foundation" of Hungary Funding text: Financial support from the National Research, Development and Innovation Office -NKFIH/OTKA (K67835, K68135, K115913) is gratefully acknowledged. The authors wish to express their thankfulness to the "Domus Hungarica Foundation" of Hungary for the several fellowships provided to Csaba Varhelyi jr. AB - Dioximes as ligands are used as analytical reagents and serve as models for biological systems as well as catalysts in chemical processes. A number of novel mixed complexes of the type [Fe(DioxH)2(amine)2] have been prepared and characterised by FTIR, 57Fe Mössbauer and mass spectroscopy by us. We have found strong Fe–N donor acceptor interactions and iron occurred in low-spin FeII state in all complexes. Later, we have also found that the incorporation of branching alkyl chains (isopropyl) in the complexes alters the Fe–N bond length and results in high-spin iron(II) state [1, 2]. The question arises: can the spin state of iron be manipulated generally by replacing the short alkyl chains with high volume demand ones in Fe-azomethine-amine complexes? To answer the question we have synthetized novel iron-bis-glioxime and iron-tris-gloxime complexes when long chain alkyl or aromatic ligands replaced the short alkyl ones and studied by 57Fe Mössbauer spectroscopy, MS, FTIR, UV-VIS, TG-DTA-DTG and XRD methods. Novel iron-bis-glyoxime and iron-tris-glyoxime type complexes, [Fe(Diethyl-Diox)3(BOH)2], [Fe(Diethyl-Diox)3(BOEt)2] and [Fe(phenyl-Me-Diox)3(BOEt)2], were synthesized similarly as described in [2]. The FTIR, UV-VIS, TG-DTA-DTG and MS measurements indicated that the expected novel complexes could be successfully synthesized. LA - English DB - MTMT ER - TY - JOUR AU - PANDELE-CUSU, Jeanina AU - ATKINSON, Irina AU - RUSU, Adriana AU - APOSTOL, Nicoleta AU - TEODORESCU, Valentin AU - PREDOANA, Luminita AU - Szilágyi, Imre Miklós AU - Pokol, György AU - ZAHARESCU, Maria TI - Thermal behavior of Cu-doped TiO2 gels synthesized by the sol-gel method JF - REVUE ROUMAINE DE CHIMIE J2 - REV ROUM CHIM VL - 66 PY - 2021 IS - 3 SP - 219 EP - 229 PG - 11 SN - 0035-3930 DO - 10.33224/rrch.2021.66.3.01 UR - https://m2.mtmt.hu/api/publication/32767890 ID - 32767890 N1 - “Ilie Murgulescu” Institute of Physical Chemistry of the Roumanian Academy, 202 Spl. Independentei, Bucharest, 060021, Romania National Institute of Materials Physics, 405 bis Atomistilor Street, Magurele-Ilfov, 077125, Romania Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Műegyetem rakpart 3, Budapest, H-1111, Hungary Research Center for Natural Sciences, Hungarian Academy of Science, Magyar tudósokkörútja 2, Budapest, 1117, Hungary Export Date: 8 July 2022 CODEN: RRCHA Correspondence Address: Zaharescu, M.; “Ilie Murgulescu” Institute of Physical Chemistry of the Roumanian Academy, 202 Spl. Independentei, Romania; email: mzaharescu2004@yahoo.com Funding details: BME IE-NAT TKP2020 Funding details: VEKOP-2.3.2-16-2017-00013 Funding details: European Commission, EC Funding details: Magyar Tudományos Akadémia, MTA Funding details: European Regional Development Fund, ERDF Funding text 1: This work was performed within the frame of the Mobility Project “Reduced semiconductor oxides for TCO, photocatalysis and gas sensing applications, 2019– 2021, between the Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania and the Research Center for Natural Sciences, Hungarian Academy of Science Research Group of the Hungarian Academy of Science at the Budapest, Hungary. An NRDI K 124212 and an NRDI TNN_16 123631 grants are acknowledged. The research within project No. VEKOP-2.3.2-16-2017-00013 was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund. The research reported in this paper was supported by the BME Nanotechnology and Materials Science TKP2020 IE grant of NKFIH Hungary (BME IE-NAT TKP2020). Funding text 2: Acknowledgements. This work was performed within the frame of the Mobility Project “Reduced semiconductor oxides for TCO, photocatalysis and gas sensing applications, 2019– 2021, between the Ilie Murgulescu Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania and the Research Center for Natural Sciences, Hungarian Academy of Science Research Group of the Hungarian Academy of Science at the Budapest, Hungary. An NRDI K 124212 and an NRDI TNN_16 123631 grants are acknowledged. The research within project No. VEKOP-2.3.2-16-2017-00013 was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund. The research reported in this paper was supported by the BME Nanotechnology and Materials Science TKP2020 IE grant of NKFIH Hungary (BME IE-NAT TKP2020). LA - English DB - MTMT ER -