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1.

001-es BibID:BIBFORM018762
Első szerző:Alagha, Ahmed
Cím:Metal complexes of cyclic hydroxamates. Synthesis and crystal structures of 3-hydroxy-2-methyl-3H-quinazolin-4-one (ChaH) and of its Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes / Ahmed Alagha, Laavanya Parthasarathi, Declan Gaynor, Helge Müller-Bunz, Zoya A. Starikova, Etelka Farkas, Eimear C. O'Brien, Marie-Jose Gil, Kevin B. Nolan
Dátum:2011
ISSN:0020-1693
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Cyclic hydroxamic acid
Metal complexes
X-ray structures
Speciation
Stability
Megjelenés:Inorganica Chimica Acta. - 368 : 1 (2011), p. 58-66. -
További szerzők:Parthasarathi, Laavanya Gaynor, Declan Müller-Bunz, Helge Starikova, Zoya A. Farkas Etelka (1948-) (vegyész) O'Brien, Eimear C. Gil, Marie-Jose Nolan, Kevin B.
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2.

001-es BibID:BIBFORM010507
Első szerző:Baranyai Zsolt (vegyész)
Cím:A solution thermodynamic study of the Cu(II) and Zn(II) complexes of EBTA: X-ray crystal structure of the dimeric complex [Cu-2(EBTA)(H2O)(3)](2) / Zsolt Baranyai, Gabriella Bombieri, Fiorella Meneghetti, Lorenzo Tei, Mauro Botta
Dátum:2009
ISSN:0020-1693
Megjegyzések:The copper(II) complex of the acyclic EBTA ligand (H(4)EBTA = 1,2-bis(2-aminoethoxy) benzene-N,N,N',N'-tetraacetic acid) has been prepared and characterized by X-ray analysis. The two copper ions of the dinuclear unit present the same distorted octahedral coordination polyhedra. The EBTA ligand is shared between two copper coordination centres, with the formation of centrosymmetric dimers, which are linked in a supramolecular tridimensional structure via additional interactions through the coordinated waters molecules with adjacent carboxylic oxygen atoms. The stability and protonation constants of EBTA with Cu(II) and Zn(II) ions indicate a higher stability of these complexes with respect to the corresponding complexes with the more flexible EGTA ligand (H(4)EGTA = ethyleneglycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid). On the other hand, the lower stability of [Gd(EBTA)] than [Gd(EGTA)] results in a decreased overall selectivity (lower K-sel) of EBTA towards Gd(III) and suggests that this complex may undergoes transmetallation reactions under physiological conditions.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Inorganica Chimica Acta. - 362 : 7 (2009), p. 2259-2264. -
További szerzők:Bombieri, Gabriella Meneghetti, Fiorella Tei, Lorenzo Botta, Mauro
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3.

001-es BibID:BIBFORM081593
Első szerző:Bolyog-Nagy Evelin (okleveles vegyész)
Cím:Facile synthesis of [Ru(?2-O2CO)(pta)(?6-p-cymene)], an outstandingly active Ru(II) half-sandwich complex for redox isomerization of allylic alcohols / Bolyog-Nagy Evelin, Udvardy Antal, Barczáné-Bertók Ágnes, Joó Ferenc, Kathó Ágnes
Dátum:2017
ISSN:0020-1693
Megjegyzések:The water-soluble [RuCl2(pta)(?6-p-cymene)] (pta = 1,3,5-triaza-7-phosphaadamantane) was applied as catalyst in the transposition of allylic alcohols, such as oct-1-en-3-ol in aqueous media. The isomerisation of oct-1-en-3-ol to octan-3-one took place only at pH > 10 buffer solutions or in the presence of alkali metal carbonates. The aqueous solution of "in situ" catalyst ([RuCl2(pta)(?6-p-cymene)] + 2 eq Na2CO3) could be reused in the biphasic isomerization of oct-1-en-3-ol for at least five times without a significant loss of the catalytic activity. It was demonstrated that carbonate is not only a base in this reaction but leads to formation of a highly active catalyst, [Ru(?2-O2CO)(pta)(?6-p-cymene)]. This compound was isolated as crystalline solid and characterized in detail (including X-ray diffraction).
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 455 (2017), p. 514-520. -
További szerzők:Udvardy Antal (1981-) (vegyész) Barczáné-Bertók Ágnes Joó Ferenc (1949-) (vegyész) Kathó Ágnes (1954-) (vegyész, kémikus)
Pályázati támogatás:OTKA K101372
OTKA
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4.

001-es BibID:BIBFORM084877
Első szerző:Bouhsina, Saad
Cím:Formation of oligonuclear complexes between copper(II) and 1-hydroxyethane-1,1-diphosphonic acid / Saad Bouhsina, Péter Buglyó, Edmond Abi Aad, Antoine Aboukais, Tamás Kiss
Dátum:2004
ISSN:0020-1693
Megjegyzések:The complex formation between Cu(II) and 1-hydroxyethane-1,1-diphosphonic acid was studied by means of pH-potentiometry and spectroscopy (UV-Vis and EPR). Speciation revealed the formation of a trinuclear complex [Cu3A3]6 besides the mononuclear 1:1 and 1:2 species. In the complex [Cu3A3]6, which is not formed with other diphosphonic derivatives, the ligands adopt chelating and bridging modes via the four O atoms of the two phosphonates, the alcoholic-OH groups remaining in the protonated form.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 357 : 1 (2004), p. 305-310. -
További szerzők:Buglyó Péter (1965-) (vegyész) Abi Aad, Edmond Aboukais, Antoine Kiss Tamás
Pályázati támogatás:OTKA T37385
OTKA
OTKA T31896
OTKA
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5.

001-es BibID:BIBFORM087717
Első szerző:Buglyó Péter (vegyész)
Cím:Speciation and NMR relaxation studies of VO(IV) complexes with several O-donor containing ligands: oxalate, malonate, maltolate and kojate / Péter Buglyó, Erzsébet Kiss, István Fábián, Tamás Kiss, Daniele Sanna, Eugenio Garribba, Giovanni Micera
Dátum:2000
ISSN:0020-1693
Megjegyzések:Potentiometric, spectral and 1H NMR relaxation studies are reported on the complex formation of VO(IV) with the bidentate chelating ligands oxalic and malonic acids, of a dicarboxylic nature, and maltol and kojic acid, of the hydroxy-4-pyrone type. Complexes with stochiometries VOA and VOA2 were characterised in aqueous solution. Two main features were established for the complex systems. It was found that five-membered ring chelation favours the cis arrangement in the bis complexes of maltol and kojic acid to a higher extent than in those of oxalic and malonic acids. Moreover, previous investigations of VO(IV) binding to maltol or its analogues did not consider the formation of hydroxo species. Formation of dihydroxo bridged dimeric complexes of stoichiometry (VOAH?1)2 and monomeric hydroxo species VOA2H?1 or VOA2(OH), are now taken into account in order to explain the equilibrium and spectroscopic results. 1H NMR relaxation measurements strongly suggest an equilibrium between the two isomers of the bis complexes.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Vanadium complexes
Oxo complexes
Oxalate complexes
Malonate complexes
Maltolate complexes
Megjelenés:Inorganica Chimica Acta. - 306 : 2 (2000), p. 174-183. -
További szerzők:Kiss Erzsébet (vegyész) Fábián István (1956-) (vegyész) Kiss Tamás Sanna, Daniele (1956-) (vegyész) Garribba, Eugenio Micera, Giovanni
Pályázati támogatás:T 23776
OTKA
T 29568
OTKA
T 28244
OTKA
FKFP 0013/97
Egyéb
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6.

001-es BibID:BIBFORM078704
Első szerző:Buglyó Péter (vegyész)
Cím:Tuning the redox potentials of ternary cobalt(III) complexes containing various hydroxamates / Buglyó Péter, Kacsir István, Kozsup Máté, Nagy Imre, Nagy Sándor, Bényei Attila Csaba, Kováts Éva, Farkas Etelka
Dátum:2018
ISSN:0020-1693
Megjegyzések:Sixteen cobalt(III) complexes incorporating one of the investigated 4N donor tripodal amines in the presence or absence of differently substituted hydroxamates have been synthesized and the effect of the nature of the N-donor, size of the chelates formed and the effect of the type of the substituent(s) at the hydroxamate moiety on the redox properties of the complexes have been studied. The crystal and molecular structures of the new complexes, [Co(unspenp)(H2O)Cl]Cl2.H2O (4), [Co(tren)(phebha)](ClO4)2 (11), [Co(tpa)(bha)](ClO4)2?C2H5OH?H2O (15) and [Co(tpa)(phebha)](ClO4)2 (16) have also been determined by single crystal X-ray diffraction method. Cyclic voltammetric (CV) results indicated the irreversible reduction of Co(III) in all the investigated complexes. Out of the four studied tripodal amines, abap was found to decrease the Co(III/II) reduction potential far below the region of bioreductants. Decreasing of two of the chains by one CH2 in tren compared to abap resulted in less negative reduction potential of the corresponding complex. Further positive shift was observed by introducing two (uns-penp), and especially three (tpa) ?-back-bonding pyridyl rings into the chains of tetramines. In agreement with literature results, the 3+ oxidation state of the central cobalt ion was found to be extremely stabilized in the ternary complexes containing the doubly deprotonated benzohydroximate, but the metal ion is significantly more reducible in the ternary complexes with mono-deprotonated benzohydroxamate/derivative ligands. Measurable effect was not found on the redox potential via introduction of chloro or nitro substituents in para position into the phenyl moiety of bha? (Cl-bha? and NO2-bha? ). Significant positive shift (ca. 200 mV) was obtained, however, when RN = H was replaced by a phenyl ring in phebha? therefore complexes with this latter ligand can be likely candidates for the in vitro releasing of hydroxamates with proven biological activity.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Inorganica Chimica Acta. - 472 (2018), p. 234-242. -
További szerzők:Kacsir István (1994-) (vegyész) Kozsup Máté (1992-) (Okleveles vegyész) Nagy Imre (1992-) (vegyész analitikus) Nagy Sándor (1993-) (vegyész) Bényei Attila (1962-) (vegyész) Kováts Éva (1977-) (vegyész) Farkas Etelka (1948-) (vegyész)
Pályázati támogatás:GINOP-2.3.2-15-2016-00008
GINOP
OTKA-112317
OTKA
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7.

001-es BibID:BIBFORM107565
035-os BibID:(Cikkazonosító)121153 (WoS)000849920300005 (Scopus)85136453241
Első szerző:Császár Zsófia (vegyész)
Cím:Hydrogen bond-directed coordination of phosphine-amino-alcohol (P,N,OH) ligands: Stereochemical considerations and catalytic studies / Zsófia Császár, Mária Guóth, Evelin Farsang, Attila C. Bényei, József Bakos, Gergely Farkas
Dátum:2022
ISSN:0020-1693 1873-3255
Megjegyzések:Novel phosphine-aminoalcohol type chiral ligands of the chemical formula Ph2PCH(CH3)CH2CH(CH3)NHCH(R)CH2OH (1a: (R, R)-(S), R = CH3 , 1b: (S, S)-(S), R = CH3 , 1c: (S, S), R = H) have been synthesized in two simple steps using cyclic sulfates. The coordination behavior of 1a-c having stereochemically labile nitrogen donor to square planar Pd(II) center was investigated by X-ray crystallography, 1D and 2D NMR methods and by DFT calculations. In the solid state of complex [Pd(1a)Cl-2] an intramolecular hydrogen bond could be observed between the OH-moiety and one of the Cl co-ligands, while intermolecular hydrogen bonds were detected in the case of [Pd(1b)Cl-2] between the same functionalities. In the dichloromethane solution of the complexes the hydrogen bond was identified as a crucial factor in determining ring conformation and nitrogen configuration. Ligand 1a coordinated stereoselectively to the metal in [Pd(1a)Cl-2] leading to a complex having a single conformationally rigid six-membered chelate and a configurationally fixed N-donor. In contrast, coordination of ligands 1b-c resulted in the formation of a mixture of isomers with different chelate conformation and nitrogen configuration. The ligands were utilized in Pd-catalyzed asymmetric allylic alkylation where high enantioselectivities (ees up to 96 %) and activities could be obtained.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 543 (2022), p. 1-8. -
További szerzők:Guóth Mária Farsang Evelin Bényei Attila (1962-) (vegyész) Bakos József (vegyész) Farkas Gergely
Pályázati támogatás:K128074
Egyéb
TKP2021-NKTA-21
Egyéb
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8.

001-es BibID:BIBFORM114649
035-os BibID:(WoS)001031841400001 (Scopus)85163800293 (cikkazonosító)121613
Első szerző:Czégéni Csilla Enikő (vegyész)
Cím:Ion-exchange resin-supported palladium catalysts for hydrodehalogenation of aryl halides under batch and continuous flow conditions / Csilla Enikő Czégéni, Henrietta Kovács, Gábor Papp, Ágnes Kathó, Ferenc Joó
Dátum:2023
ISSN:0020-1693
Megjegyzések:Anion-exchange resin-supported palladium catalysts for dehalogenation of aromatic halides have been prepared by immobilizing Pd(II) on anion-exchange resins followed by reduction in hydrogen atmosphere. These catalysts showed high catalytic activity and selectivity in the hydrodehalogenation of various aryl halides both by hydrogen transfer from aqueous sodium formate in water-ionic liquid mixtures under batch conditions, and by hydrogenation in ethanol under moderate pressure of H2 in a continuous flow microreactor.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Anion-exchange resin
Flow microreactor
Hydrodehalogenation
Immobilization
Palladium
Megjelenés:Inorganica Chimica Acta. - 556 (2023), p.1-9,(cikkazonosító)121613-. -
További szerzők:Kovács Henrietta (1992-) (okleveles vegyész) Papp Gábor Kathó Ágnes (1954-) (vegyész, kémikus) Joó Ferenc
Pályázati támogatás:GINOP-2.3.3-15- 2016-00004
GINOP
GINOP 2.3.2-15-2016-00008
GINOP
2020-4.1.1-TKP2020
Egyéb
FK-128333
Egyéb
RRF-2.3.1-21-2022-00009
Egyéb
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9.

001-es BibID:BIBFORM102646
Első szerző:Dancs Ágnes
Cím:Increasing the histidine 'density' in tripodal peptides by gradual N-functionalization of tris(2-aminoethyl)amine (tren) with l-histidyl units: The effect on zinc(II) complexes / Dancs Ágnes, Selmeczi Katalin, Bányai István, Darula Zsuzsanna, Gajda Tamás
Dátum:2018
ISSN:0020-1693
Megjegyzések:Tripodal peptidomimetics have received increasing interest among others as efficient metal ion chelators. Most of these studies have focused on symmetrical, tri-substituted ligands. Our aim was to establish how the increasing donor group ♭density', i.e. the gradual N-histidyl substitution, alters the coordination chemical properties of the tripodal platform. To this end we synthesized mono-, bis- and tris(L-his tidyl)-functionalized tren derivatives (L1, L2 and L3, respectively), and studied their zinc(II) complexes by pH potentiometry, 1 H NMR and MS spectroscopy. The three ligands provide a variety of donor sites, and consequently different stability and structure for their zinc(II) complexes depending on the pH and metal-to-ligand ratios. In the neutral pH range histamine-like coordination is operating in all cases. Due to the formation of macrochelate between the two/three {Nim,NH2} binding sites, L2 and L3 have considerably higher zinc(II) binding ability than histamine, or any other simple peptide with N-terminal His unit. The situation is fundamentally different at higher pH. The tren-like subunit in L1 acts as an anchoring site for amide deprotonation, and the {3NH2,N ,Ntert} type coordination, a rare example where zinc(II)-amide N coordination takes place, results in outstanding stability. Although L1 provides tight binding above pH 7, it forms only mononuclear species. However, the increasing level of functionalization in L2 and L3 allows the formation of oligonuclear complexes, and at threefold zinc(II) excess the three ligands share nearly the same amount of zinc(II). Moreover, the high histidine ♭density' in L2 and L3 also provides the formation of imidazolato-bridged structures, which has never been observed before in zinc (II) complexes of simple linear peptides
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 472 (2018), p. 174-183. -
További szerzők:Selmeczi Katalin Bányai István (1953-) (vegyész) Darula Zsuzsanna Gajda Tamás
Pályázati támogatás:GINOP-2.3.2-15-2016-00038
GINOP
OTKA 101541
OTKA
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10.

001-es BibID:BIBFORM102762
035-os BibID:(WOS)000424293700001 (Scopus)85030750213
Első szerző:Farkas Etelka (vegyész)
Cím:Preface / Farkas Etelka
Dátum:2018
ISSN:0020-1693
Tárgyszavak:Sóvágó Imre (1946-) (vegyész) Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 472 (2018), p. 1-2. -
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11.

001-es BibID:BIBFORM085976
Első szerző:Farkas Etelka (vegyész)
Cím:Factors affecting the metal ion-hydroxamate interactions: effect of the position of the peptide function in the connecting chain on the Fe(III), Mo(VI) and V(V) complexation of some new desferrioxamine B (DFB) model dihydroxamic acids / Etelka Farkas, Péter Buglyó, Éva A. Enyedy, Veronika A. Gerlei, Amelia M. Santos
Dátum:2002
ISSN:0020-1693
Megjegyzések:Three new dihydroxamic acids (HO(CH3)NCO (CH2) x CO NH (CH2) y CON(CH3)OH, where the related x and y values are as follows: 2,5; 3,4 and 3,3) with different length of the connecting chains containing the peptide group in different positions between the two functional groups were synthesized and their complexation with Fe(III), Mo(VI) and V(V) were studied by pH-potentiometric and spectrophotometric methods. Both the structure and length of the connecting chain in the 2,5-dihydroxamic acid (2,5-DIHA) are the same as those in the natural siderophore, desferrioxamine B (DFB). Although the stability of the monochelated complexes formed with all three dihydroxamic acids are similar, 2,5-DIHA forms significantly more stable bis-chelated complexes than the other two ligands with the three metal ions studied. The results support the hypothesis that the arrangement of the two chelating functions in 2,5-DIHA is in a proper preorganization for the coordination in octahedral complexes to metal ions having similar ionic radius as iron(III) has.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Dihydroxamic acids
Fe(III)
Mo(VI) and V(V) complexes
Desferrioxamine B models
Megjelenés:Inorganica Chimica Acta. - 339 (2002), p. 215-223. -
További szerzők:Buglyó Péter (1965-) (vegyész) Enyedy Éva Anna (1975-) (vegyész) Gerlei Veronika A. Santos, Amelia M.
Pályázati támogatás:T034674
OTKA
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12.

001-es BibID:BIBFORM084879
Első szerző:Farkas Etelka (vegyész)
Cím:Factors affecting the metal ion-hydroxamate interactions II: effect of the length of the connecting chain on the Fe(III), Mo(VI) and V(V) complexation of some new desferrioxamine B (DFB) model dihydroxamic acids / Farkas Etelka, Buglyó Péter, Enyedy Éva A., M. Amelia Santos
Dátum:2004
ISSN:0020-1693
Megjegyzések:Three new dihydroxamic acids (HO(CH3)NCO?(CH2)2?CO?NH?(CH2)x?CON(CH3)OH where the x values are 4; 3 and 2, and the compounds are abbreviated as 2,4-DIHA, 2,3-DIHA and 2,2-DIHA), containing the peptide group in a certain position to one of the two functional groups and in different distances to the other one, were synthesized and their complexation with Fe(III), Mo(VI) and V(V) was studied by pH-potentiometric, spectrophotometric and in some cases by CV methods to evaluate the redox behaviour of the Fe(III) complexes and assess their potential biological activity as siderophore models. All these compounds are structural models for the natural siderophore, desferrioxamine B (DFB). The results were compared to those of the complexes of 2,5-DIHA having the same connecting chain structure and length as DFB has, and the effects of the length of the connecting chain on the co-ordination mode and on the stability of the complexes formed were evaluated. Very similar stability of the mono-chelated complexes formed with all these dihydroxamic acids was found. All the results obtained suggest that one dihydroxamic acid (even the 2,2-DIHA) is able to complete the four coordination sites of a MoO 2? 2 core forming simple mononuclear complexes. Favoured monomeric structures of the bis-chelated complexes of these dihydroxamic acids are also suggested with V(V) having the smallest ionic radius among the three metal ions studied. In the case of iron(III), however, clear indication was obtained for the slightly different complexation behaviour of 2,2-DIHA. Namely, the formation of the mononuclear bis-chelated complex with this shortest ligand seems to have sufficient strain to induce the formation of bimetallic species such as [Fe(2,2-DIHA)2Fe)]2?. 2004 Elsevier B.V. All rights reserved.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Dihydroxamic acids
Fe(III)
Mo(VI) and V(V) complexes
Desferrioxamine B models
Megjelenés:Inorganica Chimica Acta. - 357 : 9 (2004), p. 2451-2461. -
További szerzők:Buglyó Péter (1965-) (vegyész) Enyedy Éva Anna (1975-) (vegyész) Santos, Amelia M.
Pályázati támogatás:T034674
OTKA
TS 040685
OTKA
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