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 - Korecz, László AU - Pokol, György AU - Szalay, Roland AU - GOGA, FIRUŢA AU - Simon-Várhelyi, Melinda AU - Tötös, Róbert AU - Huszthy, Péter AU - Madarász, János AU - PAPP, JUDIT AU - Mihály, Judith TI - Réz-komplexek glioximokkal, Schiff-bázisokkal, szemi- és tioszemi-karbazonokkal, valamint fizikai-kémiai és biológiai vizsgálatuk (Copper Complexes with Glyoximes, Schiff Bases, Semi- and Thiosemicarbazones, and their Physical-Chemical and Biological Study) T2 - EME – A Magyar Tudomány Napja Erdélyben, 20. fórum, ÉRTÉKTEREMTŐ TUDOMÁNY - Természettudományi szakosztály PY - 2021 SP - 28 EP - 30 PG - 3 UR - https://m2.mtmt.hu/api/publication/32761146 ID - 32761146 AB - Kutatásunk során a következő típusú réz(II)-komplexeket állítottuk elő glioximokkal, aminokkal, Schiff-bázisokkal, valamint szemi (SC)- és tioszemikarbazonokkal (TSC): [Cu(GlioxH)2(amin)2], [Cu(2-heptanon)2A], [Cu(2-heptanon)2A(amin)2], [Cu(2-heptanon-SC)2], [Cu(2-heptanon-TSC)2], ahol GlioxH2: etil-butil-glioxim, metil-butil-glioxim, fenil-metil-glioxim; amin: dibutil-amin, 6-amino-3-pikolin, 1-amino-pentán, difenil-amin, 3-metil-piperidin, 3-pikolin, 3-aminofenol, diizopropil-amin, 2-pikolin, 3-amino-1,2,4-triazol, imidazol; A: 1,2-diaminoetán, 1,2- és 1,3-diaminopropán, o-fenilén-diamin. A felhasználási lehetőségek bemutatása után tárgyaljuk komplexeink kémiai és biológiai sajátosságait, szerkezetét FTIR, ESR, UV-VIS spektroszkópiai, valamint termoanalitikai (TG, DTA, DTG), tömegspektrometriai és por-röntgen diffrakciós (XRD) módszerek segítségével. A réz-komplexeket széles körben tanulmányozzák potenciális antibakteriális, maláriaellenes és gombaellenes hatásuk szempontjából. Számos képviselőjük az Alzheimer- és Parkinson-kór, valamint cél-specifikus újgenerációs rákellenes és gyulladáscsökkentő gyógyszerek. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Béres, Kende Attila AU - Sajó, István AU - Lendvay, György AU - Trif, László AU - Petruševski, VM. AU - Barta-Holló, B AU - Korecz, László AU - Paiva Franguelli, Fernanda AU - Nagyné László, Krisztina AU - Szilágyi, Imre Miklós AU - Kótai, László TI - Solid-Phase “Self-Hydrolysis” of [Zn(NH3)4MoO4@2H2O] Involving Enclathrated Water—An Easy Route to a Layered Basic Ammonium Zinc Molybdate Coordination Polymer JF - MOLECULES J2 - MOLECULES VL - 26 PY - 2021 IS - 13 PG - 19 SN - 1420-3049 DO - 10.3390/molecules26134022 UR - https://m2.mtmt.hu/api/publication/32089016 ID - 32089016 LA - English DB - MTMT ER - TY - JOUR AU - Bors, István AU - Purgel, Mihály AU - Fehér, Péter Pál AU - Varga, Tamás AU - Speier, Gábor AU - Korecz, László AU - Kaizer, József TI - Unexpected radical mechanism in a [4+1] cycloaddition reaction JF - NEW JOURNAL OF CHEMISTRY J2 - NEW J CHEM VL - 45 PY - 2021 IS - 19 SP - 8440 EP - 8444 PG - 5 SN - 1144-0546 DO - 10.1039/D1NJ00660F UR - https://m2.mtmt.hu/api/publication/32010145 ID - 32010145 N1 - Research Group of Bioorganic and Biocoordination Chemistry, University of Pannonia, Veszprém, H-8200, Hungary Department of Physical Chemistry, University of Debrecen, Debrecen, H-4032, Hungary Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, H-1117, Hungary Department of Process Engineering, University of Pannonia, Veszprém, H-8200, Hungary Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Budapest, H-1117, Hungary Export Date: 18 November 2022 CODEN: NJCHE Correspondence Address: Kaizer, J.; Research Group of Bioorganic and Biocoordination Chemistry, Hungary; email: kaizer@almos.uni-pannon.hu AB - 9,10-Phenanthrenequinone monoimines (2,7-R-PQI, R = tBu, H, Br, NO2, 1a–d) undergo a [4+1] cycloaddition reaction with triphenylphosphine to give 2,3-dihydro-2,2,2-triphenylphenanthro[9,10-d]-1,3,2λ5-oxazaphospholes (3a–d). During the reaction, highly colored radicals are formed as intermediates, which were characterized by EPR and UV-vis spectroscopy. The formation rate and the rate of decay of these radicals were determined kinetically. These radicals exhibit high persistency and under inert conditions can be handled conveniently. Based on detailed kinetic and spectroscopic studies and DFT calculations, a plausible mechanism has been proposed. LA - English DB - MTMT ER - TY - JOUR AU - Szijjártóné Majrik, Katalin AU - Pászti, Zoltán AU - Korecz, László AU - Mihály, Judith AU - May, Zoltán AU - Németh, Péter AU - Cannilla, C AU - Bonura, G AU - Frusteri, F AU - Tompos, András AU - Tálas, Emília TI - Effect of the Microstructure of the Semiconductor Support on the Photocatalytic Performance of the Pt-PtOx/TiO2 Catalyst System JF - MATERIALS J2 - MATERIALS VL - 14 PY - 2021 IS - 4 PG - 20 SN - 1996-1944 DO - 10.3390/ma14040943 UR - https://m2.mtmt.hu/api/publication/31920027 ID - 31920027 N1 - Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Eötvös Loránd Research Network (ELKH), Magyar Tudósok Körútja 2, Budapest, H-1117, Hungary Department of Earth and Environmental Sciences, University of Pannonia, Egyetem út 10, Veszprém, H-8200, Hungary National Council of Research–CNR-ITAE, “Nicola Giordano”, Via S. Lucia 5, Messina, 98126, Italy Export Date: 18 November 2022 Correspondence Address: Pászti, Z.; Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, Hungary; email: may.zoltan@ttk.hu LA - English DB - MTMT ER - TY - CHAP AU - Várhelyi, Csaba, ifj. AU - Szilágyi, Imre-Miklós AU - Goga, Firuţa AU - Pokol, György AU - Kuzmann, Ernő AU - Szalay, Roland AU - Korecz, László AU - Papp, Judit AU - Várhelyi, Melinda AU - Mihály, Judith ED - Anon, - TI - THERMAL AND SPECTROSCOPICAL ANALYSIS OF IRON(II) AND COPPER(II) COMPLEXES WITH AZOMETHINES T2 - 2nd Journal of Thermal Analysis and Calorimetry Conference PB - Akadémiai Kiadó CY - Budapest SN - 9789634544166 PY - 2019 SP - 323 EP - 324 PG - 2 UR - https://m2.mtmt.hu/api/publication/30806124 ID - 30806124 AB - The roles of biologically active transition metal (such as Fe, Cu) complexes with antibacterial, antifungal, and anticancer property have attracted much interest during last decades. Numerous chelates containing Cu2+ have been shown to possess anti-inflammatory activity [1]. Efforts are now focused to develop novel antitumor drugs which can improve clinical effectiveness, in order to reduce general toxicity and to broaden the spectrum of activity. Due to its interaction with many biomolecules and synthetic substances including organometallic compounds and metal complexes, DNA is a main target for the therapeutic treatment of various disorders and diseases [2]. Metal complex based functional metalloenzymes play also an important role as highly active and selective catalysts governing vital functions of living organisms [3]. In our research project new Fe(II) and Cu(II) complexes were synthesized from the reaction between azomethine derivatives (glyoximes, Schiff bases, semi- and thiosemicarbazones) and Fe(II) or Cu(II) salts, respectively, in suitable solvent. After presenting a short historical survey, classification, and possible application fields of these compounds, we report the study of their thermoanalytical behaviour (TG, DTA, DTG), spectroscopic features (such as FTIR, NMR, UV-VIS, Raman, Mössbauer, ESR spectroscopy, mass spectrometry) as well as their powder XRD. The biological activity of complexes, especially their antibacterial activity, will also be discussed. LA - English DB - MTMT ER - TY - JOUR AU - May, Nóra Veronika AU - Gál, Gyula Tamás AU - Szentendrei, Zsolt AU - Korecz, László AU - May, Zoltán AU - Ferlin, Maria Grazia AU - Dean, Annalisa AU - Bombicz, Petra AU - Di Marco, Valerio B. TI - Relationship between solid state structure and solution stability of copper(II)-hydroxypyridinecarboxylate complexes JF - NEW JOURNAL OF CHEMISTRY J2 - NEW J CHEM VL - 43 PY - 2019 IS - 27 SP - 10699 EP - 10710 PG - 12 SN - 1144-0546 DO - 10.1039/c9nj01469a UR - https://m2.mtmt.hu/api/publication/30746455 ID - 30746455 AB - The complementary solid state/solution studies of the systematic series of bioactive ligands 3-hydroxy-1-methyl-4-pyridinecarboxylate (L1), 3-hydroxy-1,2,6-trimethyl-4-pyridinecarboxylate (L2), 4-hydroxy-1-methyl-3-pyridinecarboxylate (L3), 4-hydroxy-1,6-dimethyl-3-pyridinecarboxylate (L4), 4-hydroxy-1-(2-hydroxyethyl)-6-methyl-3-pyridinecarboxylate (L5) and 4-hydroxy-1-(2-carboxyethyl)-6-methyl-3pyridinecarboxylate (L6) with copper(II) have been performed in order to design efficient chelating drugs for the treatment of metal overloading conditions. Single crystals of [Cu(L1)(2)(H2O)]center dot 3H(2)O (1) (monomer) with axial water coordination, [Cu-2(L2)(4)]center dot 6H(2)O (2) and [Cu-2(L3)(4)]center dot 4H(2)O (3) (cyclic dimers), where pyridinolato and carboxylato oxygens, respectively, act as linkers between adjacent copper complexes, [Cu(L4)(2)](n)center dot 3H(2)O (4) (1D polymer) and [Cu-3(L5)(6)]center dot 18H(2)O (5) (trimer), constructed using two square-pyramidal and one elongated octahedral Cu(II) complexes have been determined by SXRD. The bidentate coordination mode of the ligands has been found preferentially with cis arrangements in 1 and 2 and trans arrangements in 3-5. The solution speciation and complex stability of aqueous solutions have been studied by pH-dependent electron paramagnetic resonance spectroscopy resulting in the detection of solely monomeric [CuL](+) and [CuL2] complexes. The stability order obtained for the [CuL](+) complexes could be correlated with the deprotonation constants of their hydroxyl group (log beta(LH)) reflecting that the higher acidity increases the complex stability in the order L2 < L1 approximate to L6 < L4 approximate to L5 < L3. This stability order elucidates the different axial linkers in the cyclic dimers 2 and 3. DFT quantum-chemical calculations support the effect of the electron distribution on the established stability order. LA - English DB - MTMT ER - TY - JOUR AU - Hell, Zoltán AU - Korecz, László AU - Békássy, Sándor TI - Spectroscopic Evidence for the Involvement of a Radical Intermediate in the Friedel-Crafts Benzylation Using Ion-Exchanged K10 Catalysts JF - PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING J2 - PERIOD POLYTECH CHEM ENG VL - 62 PY - 2018 IS - 4 SP - 497 EP - 502 PG - 6 SN - 0324-5853 DO - 10.3311/PPch.12842 UR - https://m2.mtmt.hu/api/publication/30326257 ID - 30326257 N1 - Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, P. O. Box 91, Budapest, H-1521, Hungary Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest, 1117, Hungary Cited By :1 Export Date: 23 May 2021 Correspondence Address: Hell, Z.; Department of Organic Chemistry and Technology, P. O. Box 91, Hungary; email: zhell@mail.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Szijjártóné Majrik, Katalin AU - Pászti, Zoltán AU - Korecz, László AU - Trif, László AU - Domján, Attila AU - Bonura, G AU - Cannilla, C AU - Frusteri, F AU - Tompos, András AU - Tálas, Emília TI - Study of PtOx/TiO2 Photocatalysts in the Photocatalytic Reforming of Glycerol: The Role of Co-Catalyst Formation JF - MATERIALS J2 - MATERIALS VL - 11 ET - 0 PY - 2018 IS - 10 PG - 24 SN - 1996-1944 DO - 10.3390/ma11101927 UR - https://m2.mtmt.hu/api/publication/30309327 ID - 30309327 N1 - Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest, H-1117, Hungary NMR Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest, H-1117, Hungary National Council of Research-CNR-ITAE, 'Nicola Giordano', Via S. Lucia 5, Messina, 98126, Italy Cited By :19 Export Date: 12 February 2024 Correspondence Address: Tálas, E.; Institute of Materials and Environmental Chemistry, Magyar tudósok körútja 2, Hungary; email: talas.emilia@ttk.mta.hu AB - In this study, relationships between preparation conditions, structure, and activity of Pt-containing TiO2 photocatalysts in photoinduced reforming of glycerol for H-2 production were explored. Commercial Aerolyst((R)) TiO2 (P25) and homemade TiO2 prepared by precipitation-aging method were used as semiconductors. Pt co-catalysts were prepared by incipient wetness impregnation from aqueous solution of Pt(NH3)(4)(NO3)(2) and activated by calcination, high temperature hydrogen, or nitrogen treatments. The chemico-physical and structural properties were evaluated by XRD, H-1 MAS NMR, ESR, XPS, TG-MS and TEM. The highest H-2 evolution rate was observed over P25 based samples and the H-2 treatment resulted in more active samples than the other co-catalyst formation methods. In all calcined samples, reduction of Pt occurred during the photocatalytic reaction. Platinum was more easily reducible in all of the P25 supported samples compared to those obtained from the more water-retentive homemade TiO2. This result was related to the negative effect of the adsorbed water content of the homemade TiO2 on Pt reduction and on particle growth during co-catalyst formation. LA - English DB - MTMT ER - TY - JOUR AU - Pazonyi, Piroska AU - Virág, Attila AU - Gere, Kinga AU - Botfalvai, Gábor AU - Sebe, Krisztina AU - Szentesi, Zoltán AU - Mészáros, Lukács AU - Botka, Dániel Bálint AU - Gasparik, Mihály AU - Korecz, László TI - Sedimentological, taphonomical and palaeoecological aspects of the late early Pleistocene vertebrate fauna from the Somssich Hill 2 site (South Hungary) JF - COMPTES RENDUS PALEVOL J2 - CR PALEVOL VL - 17 PY - 2018 IS - 4-5 SP - 296 EP - 309 PG - 14 SN - 1631-0683 DO - 10.1016/j.crpv.2017.06.007 UR - https://m2.mtmt.hu/api/publication/3254597 ID - 3254597 LA - English DB - MTMT ER -