TY - JOUR AU - Martinelli, Jonathan AU - Romano, Elisabetta AU - Laczovics, Attila AU - Horváth, Dávid AU - Grattoni, Elena AU - Baranyai, Zsolt AU - Tei, Lorenzo TI - Improving the Stability and Kinetic Inertness of Mn(II) Complexes by Increasing the Bridge Length in Bicyclic CDTA‐like Ligands JF - CHEMISTRY-A EUROPEAN JOURNAL J2 - CHEM-EUR J PY - 2024 PG - 13 SN - 0947-6539 DO - 10.1002/chem.202400570 UR - https://m2.mtmt.hu/api/publication/34797366 ID - 34797366 N1 - Accepted AB - Kinetic inertness of Mn(II)‐based MRI contrast agents can be improved by increasing the rigidity of the polydentate ligand that tightly coordinate the metal ion. Taking inspiration from the remarkable increase in kinetic inertness of [Mn(CDTA)]2‐ compared to [Mn(EDTA)]2‐ due to the cyclohexyl backbone rigidity, we devised that bicyclic ligands would further improve the kinetic inertness of the Mn(II) complexes. The length of the alkyl bridge on the cyclohexane ring was varied from methylene (BCH‐DTA), ethylene (BCO‐DTA) to propylene (BCN‐DTA) to evaluate the influence of the different trans‐diaminotetraacetate ligands on relaxometric, thermodynamic and kinetic properties of the Mn(II)‐complexes. 1H and 17O NMR relaxometric studies showed a slight increase in relaxivity and a faster water exchange rate in these Mn(II)‐complexes with respect to [Mn(CDTA)]2‐. Solution studies revealed that the conditional stability (pMn) and dissociation half‐life (t1/2) at pH 7.4 follow the order [Mn(BCH‐DTA)]2‐ < [Mn(BCO‐DTA)]2‐ < [Mn(BCN‐DTA)]2‐ by highlighting the effect of the bridge length on the overall stability of the Mn(II)‐complexes. Remarkably, [Mn(BCN‐DTA)]2‐ shows an improved pMn value and a 7‐times higher kinetic inertness than [Mn(CDTA)]2‐. NMR studies on the Zn(II) analogues confirm the rigidity of the bicyclic complexes with an isomerization process at >313K for the smaller bridged complex [Zn(BCH‐DTA)]2‐ LA - English DB - MTMT ER - TY - JOUR AU - Molnár, Márk AU - Gáti, Tamás AU - Bényei, Attila Csaba AU - Nyerges, Miklós TI - Synthesis of spiro[piperidine-4,3′-pyrrolo[3,4-c]quinolines via 1,3-dipolar cycloaddition of azomethine ylides and 3-Nitro-2(1H)-quinolones JF - TETRAHEDRON LETTERS J2 - TETRAHEDRON LETT VL - 139 PY - 2024 PG - 6 SN - 0040-4039 DO - 10.1016/j.tetlet.2024.155001 UR - https://m2.mtmt.hu/api/publication/34749525 ID - 34749525 LA - English DB - MTMT ER - TY - CHAP AU - Horváth, Henrietta AU - Papp, Gábor Csaba AU - Kathó, Ágnes AU - Joó, Ferenc ED - Alegria, Elisabete C.B.A ED - Sutradhar, Manas ED - Pombeiro, Armando J.L. TI - Hydrogen Storage and Recovery with the Use of Chemical Batteries T2 - Catalysis for a Sustainable Environment PB - Wiley SN - 9781119870647 PY - 2024 SP - 819 EP - 845 PG - 27 DO - 10.1002/9781119870647.ch37 UR - https://m2.mtmt.hu/api/publication/34744028 ID - 34744028 LA - English DB - MTMT ER - TY - JOUR AU - Farkas, Vajk AU - Csókás, Dániel AU - Erdélyi, Ádám AU - Turczel, Gábor AU - Bényei, Attila Csaba AU - Nagy, Tibor AU - Kéki, Sándor AU - Pápai, Imre AU - Tuba, Róbert TI - “Inverted” Cyclic(Alkyl)(Amino)Carbene (CAAC) Ruthenium Complex Catalyzed Isomerization Metathesis (ISOMET) of Long Chain Olefins to Propylene at Low Ethylene Pressure JF - ADVANCED SCIENCE J2 - ADV SCI VL - 11 PY - 2024 IS - 12 SN - 2198-3844 DO - 10.1002/advs.202400118 UR - https://m2.mtmt.hu/api/publication/34742565 ID - 34742565 N1 - Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest, H-1117, Hungary Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, Budapest, H-1111, Hungary Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, Budapest, H-1117, Hungary Research Centre for Biochemical, Environmental and Chemical Engineering, Department of MOL Hydrocarbon and Coal Processing, University of Pannonia, Egyetem u. 10, Veszprém, H-8210, Hungary Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary Department of Applied Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, Debrecen, H-4032, Hungary Export Date: 22 March 2024 Correspondence Address: Tuba, R.; Institute of Materials and Environmental Chemistry, Magyar tudósok körútja 2, Hungary; email: tuba.robert@ttk.hu AB - Isomerization Metathesis (ISOMET) reaction is an emerging tool for “open loop” chemical recycling of polyethylene to propylene. Novel, latent N ‐Alkyl substituted Cyclic(Alkyl)(Amino)Carbene (CAAC)–ruthenium catalysts ( 5a‐Ru , 3b‐Ru – 6c‐Ru ) are developed rendering “inverted” chemical structure while showing enhanced ISOMET activity in combination with (RuHCl)(CO)(PPh 3 ) 3 ( RuH ) double bond isomerization co‐catalyst. Systematic investigations reveal that the steric hindrance of the substituents on nitrogen and carbon atom adjacent to carbene moiety in the CAAC ligand have significantly improved the catalytic activity and robustness. In contrast to the NHC‐Ru and CAAC‐Ru catalyst systems known so far, these systems show higher isomerization metathesis (ISOMET) activity (TON: 7400) on the model compound 1‐octadecene at as low as 3.0 bar optimized pressure, using technical grade (3.0) ethylene. The propylene content formed in the gas phase can reach up to 20% by volume. LA - English DB - MTMT ER - TY - JOUR AU - Vörös, Zoltán János AU - Kónya, József AU - M. Nagy, Noémi TI - Study of phosphate sorption on rendzina soil by heterogeneous isotopic exchange: a biexponential kinetic model JF - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY J2 - J RADIOANAL NUCL CHEM PY - 2024 PG - 18 SN - 0236-5731 DO - 10.1007/s10967-023-09325-1 UR - https://m2.mtmt.hu/api/publication/34630364 ID - 34630364 LA - English DB - MTMT ER - TY - JOUR AU - Nizou, Gwladys AU - Garda, Zoltán AU - Molnár, Enikő AU - Esteban-Gómez, David AU - Le Fur, Mariane AU - Fougère, Olivier AU - Rousseaux, Olivier AU - Platas-Iglesias, Carlos AU - Tripier, Raphaël AU - Tircsó, Gyula AU - Beyler, Maryline TI - Exploring the Limits of Ligand Rigidification in Transition Metal Complexes with Mono- N -Functionalized Pyclen Derivatives JF - INORGANIC CHEMISTRY J2 - INORG CHEM PY - 2024 PG - 17 SN - 0020-1669 DO - 10.1021/acs.inorgchem.3c04451 UR - https://m2.mtmt.hu/api/publication/34579892 ID - 34579892 LA - English DB - MTMT ER - TY - JOUR AU - Bazsa, György TI - Családi kapcsolatok a Magyar Tudományos Akadémia tagjai között • Family Relations among Members of the Hungarian Academy of Sciences JF - MAGYAR TUDOMÁNY J2 - MAGYAR TUDOMÁNY VL - 185 PY - 2024 IS - 2 SP - 260 EP - 265 PG - 6 SN - 0025-0325 DO - 10.1556/2065.185.2024.2.9 UR - https://m2.mtmt.hu/api/publication/34558240 ID - 34558240 AB - Összegyűjtöttük a Magyar Tudományos Akadémia egykori és mai tagjai közötti családi kapcsolatokat. A családi háttérnek bizonyára szerepe van már a tudományos pálya választásában is, és a család akadémikus tagjainak alighanem van segítő, serkentő hatásuk abban, hogy a tehetséges kutató eljusson a hazai tudományos elismerés ezen magas szintjére. Az MTA eddigi 3304 tagja közül 405 akadémikus esetén találtunk valamilyen családi-rokoni kapcsolatot. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Császár, Zsófia AU - Pőrgye, Zsanett E. AU - Farsang, Evelin AU - Kovács, Margit AU - Bényei, Attila Csaba AU - Bakos, József AU - Farkas, Gergely TI - Ruthenium complexes of new chiral phosphine‐amine‐ether ligands (Ru‐PNO) for asymmetric hydrogenation – the role of backbone chirality in pincer ligand design JF - APPLIED ORGANOMETALLIC CHEMISTRY J2 - APPL ORGANOMET CHEM PY - 2024 SN - 0268-2605 DO - 10.1002/aoc.7379 UR - https://m2.mtmt.hu/api/publication/34555466 ID - 34555466 AB - New chiral phosphine‐amine‐ether (PNO) ligands of the general formula Ph 2 PCH(R 1 )(CH 2 ) n CH(R 1 )N(R 2 )CH(R 3 )CH 2 OMe, where R 1 , R 2 , and R 3 = H or Me, n = 0 or 1, and their ruthenium complexes of the type [RuCl 2 (PPh 3 )(PNO)] have been synthesized. The coordination compounds were characterized by 1D and 2D NMR spectroscopy, modeled by DFT calculations, and in one case analyzed by X‐ray crystallography. The combined spectroscopic and theoretical investigations revealed that the relative configuration of the stereogenic elements in the P–N and N–O backbone represents a crucial factor in determining the conformation of the pincer‐type chelates and may also affect the configuration of the coordinated stereogenic nitrogen in the NH subunit, an essential element of stereochemical communication in outer sphere bifunctional catalysis. The new complexes were applied in the asymmetric hydrogenation of fused ring bicyclic ketones (i.e., 1‐tetralone and 4‐chromanone derivatives), a challenging substrate class, where enantioselectivities up to 97% could be obtained. Based on the spectroscopic and theoretical studies and catalytic experiments, structural features affecting the stereochemistry of the coordination could be identified and a qualitative enantioinduction model has been proposed. LA - English DB - MTMT ER - TY - JOUR AU - Iurgenson, Nika AU - Wang, Xinyi AU - Kong, Liubing AU - Sun, Xianyou AU - Legin, Andrey AU - Wang, Ping AU - Wan, Hao AU - Kirsanov, Dmitry TI - Feasibility study of multisensor systems for the assessment of water pollution index induced by heavy metal contamination JF - MICROCHEMICAL JOURNAL J2 - MICROCHEM J VL - 197 PY - 2024 SN - 0026-265X DO - 10.1016/j.microc.2023.109762 UR - https://m2.mtmt.hu/api/publication/34540893 ID - 34540893 LA - English DB - MTMT ER - TY - JOUR AU - Laine, Sophie AU - Jouclas, Rémy AU - Bonnet, Célia S AU - Retailleau, Pascal AU - Steinmetz, Vincent AU - Pallier, Agnès AU - Garda, Zoltán AU - Tircsó, Gyula AU - Durand, Philippe AU - Jakabné Tóth, Éva TI - Structural, stability and relaxation features of lanthanide‐complexes designed for multimodal imaging detection of enzyme activities JF - EUROPEAN JOURNAL OF INORGANIC CHEMISTRY J2 - EUR J INORG CHEM PY - 2024 SN - 1434-1948 DO - 10.1002/ejic.202300784 UR - https://m2.mtmt.hu/api/publication/34535625 ID - 34535625 AB - Lanthanide complexes of DO3A‐derivative ligands bearing a pyridine‐carbamate (L1) or pyridine‐amine (L2) arm have potential interest in the design of enzymatically activated imaging probes. Solid‐state X‐ray structures for CeL1 and YbL2 both demonstrate twisted square antiprismatic geometry, with the metal ion in a nine‐ or an eight‐coordinate environment, respectively. As assessed by pH‐potentiometry, in solution lanthanide ions form more stable complexes with the nonadentate L1 than with the octadentate L2 ligand (logKML = 18.7‐21.1 vs. 16.7‐18.6, respectively), while stability constants are similar for L1 and L2 chelates of Mg2+, Ca2+, Zn2+ or Cu2+. The kinetic inertness of GdL1 is exceptionally high with an estimated dissociation half‐life ~108 h at pH 7.4, while LnL2 (Ln = Ce, Gd, Yb) complexes have 3‐4 orders of magnitude faster dissociation, related to the presence of the protonatable, non‐coordinating amine function. The water exchange rate determined for the monohydrated GdL2 (kex298 = 1.3×106 s‐1) shows a threefold decrease with respect to GdDOTA, as a consequence of a reduction in the negative charge and in the steric crowding around the water binding site, both important in dissociatively activated water exchange processes. LA - English DB - MTMT ER -