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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: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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3.

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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4.

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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5.

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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6.

001-es BibID:BIBFORM084783
Első szerző:Farkas Etelka (vegyész)
Cím:Effect of the types and arrangements of donor atoms on Pb(II) versus Zn(II) binding preference of selected amino acids, peptides and derivatives / Etelka Farkas, Beáta Bóka, Béla Szőcs, Attila J. Godó, Imre Sóvágó
Dátum:2014
ISSN:0020-1693
Megjegyzések:Pb(II) complexes in solution formed with different amino acids [glycine (Gly), aspartic acid (Asp), histidine (His), methionine (Met), S-methyl-cysteine (SMC) and penicillamine (Pen)], dipeptides (GlyGly, Gly-Val (Val = valine), GlyMet, MetGly, GlyHis, HisGly, GlyAsp, AspGly, CysGly (Cys = cysteine), AlaCys, GlyGlu (Glu = glutamic acid), GluVal, SerGly (Ser = serine)), tripeptides (GlyGlyGly, GlyMetGly, GlyGlyMet, MetMetMet), as well as two peptidehydroxamic acids [(alanyl-alanine hydroxamic acid (AlaAlaNHOH) and N-methyl-alanyl-alanine hydroxamic acid AlaAlaN(CH3)OH)] have been studied by pH-potentiometry, 1H NMR and ESI-MS measurements. The effects of the types and arrangements of the donor atoms on the Pb(II)-binding ability as well as on the selectivity for Pb(II) over Zn(II) were evaluated. Out of the investigated molecules, the Pb(II) binding ability of Pen is far the best, but compared to this ligand, somewhat better selectivity for Pb(II) over Zn(II) can be achieved with S-containing dipeptides.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Pb(II)
Selectivity over Zn(II)
Amino acid
Peptides
Aminohydroxamic acid
Megjelenés:Inorganica Chimica Acta. - 423 : Part A (2014), p. 242-249. -
További szerzők:Bóka Beáta Szőcs Béla (1986-) (vegyész) Godó Attila J. Sóvágó Imre (1946-) (vegyész)
Pályázati támogatás:TÁMOP 4.2.2.A-11/1/KONV-2012-0043
TÁMOP
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7.

001-es BibID:BIBFORM010515
Első szerző:Farkas Etelka (vegyész)
Cím:Metal-binding ability of histidine-containing peptidehydroxamic acids: Imidazole versus hydroxamate coordination / Etelka Farkas, Edit Csapó, Péter Buglyó, Chiara A. Damante, Giuseppe Di Natale
Dátum:2009
ISSN:0020-1693
Megjegyzések:Three new peptidehydroxamic acids (L-alanyl-L-histidinehydroxamic acid, L-Ala-L-HisNHOH, L-alanyl-L-alanyl-L-histidinehydroxamic acid, L-Ala-L-Ala-L-HisNHOH and L-histidyl-L-alaninehydroxamic acid, LHis-L- AlaNHOH) were synthesized and their complexation with Cu(II), Ni(II) and Zn(II) were studied by pH-potentiometric, UV-Vis, CD, H-1 NMR, EPR and ESI-MS methods. Each of the studied peptide derivatives involves one side-chain imidazole unit and the effect of this group on the metal binding of the hydroxamic moiety is evaluated in the paper. The obtained results are compared to those of the complexes of some histidine-containing di- or tripeptides and also to those of hydroxamic derivatives of aliphatic peptides. A competition between the hydroxamate and imidazole functions occurs in all systems, but the extent differs from metal to metal, from ligand to ligand and depends very much on the pH. The imidazole was found to play the most determinant role in the Cu(II) complexes, somewhat less in the Ni(II)-containing ones, while (except the case of L-Ala-L-HisNHOH) negligible role was found in the Zn(II)- complexes. Common feature of the Ni(II)- and especially Cu(II)-containing systems is that if an imidazole-N is displaced by a hydroxamate, imidazole-bridged di- and polynuclear complexes are formed. (C) 2008 Elsevier B. V. All rights reserved.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Inorganica Chimica Acta. - 362 : 3 (2009), p. 753-762. -
További szerzők:Csapó Edit (1983-) (vegyész) Buglyó Péter (1965-) (vegyész) Damante, Chiara A. Di Natale, Giuseppe
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8.

001-es BibID:BIBFORM100489
Első szerző:Griffith, Darren M.
Cím:Synthesis and solution behaviour of stable mono-, di- and trinuclear Pd(II) complexes of 2,5-pyridinedihydroxamic acid: X-ray crystal structure of a novel Pd(II) hydroxamato complex / Darren M. Griffith, Linda Bíró, James A. Platts, Helge Müller-Bunz, Etelka Farkas, Péter Buglyó
Dátum:2012
ISSN:0020-1693
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 380 (2012), p. 291-300. -
További szerzők:Bíró Linda (1985-) (vegyész) Platts, James A. Müller-Bunz, Helge Farkas Etelka (1948-) (vegyész) Buglyó Péter (1965-) (vegyész)
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9.

001-es BibID:KLTEbibl001448
Első szerző:Kiss Tamás (vegyész)
Cím:Complexes of aminophosphonates. II. : transition metal complexes of aminophosphonic acid analogues of aspartic acid and glutamic acid / Tamás Kiss, Etelka Farkas, Henryk Kozlowski
Dátum:1989
ISSN:0020-1693
Megjegyzések:The stoichiometries and stability constants of the proton, cobalt(II), nickel(Il), copper(II) and zinc(II) complexes of 2-amino-3-phosphonopropionic acid (beta-P-Asp), 3-amino-3-phosphonopropionic acid (alpha-P- Asp) and 2-amino-4-phosphonobutanoic acid (gamma-P- Glu) have been determined pH-metrically at 25 °C and at an ionic strength of 0.2 mol dm?3 (KCl). From the stability data and the spectral parameters of the complexes, it has been established that, similarly as for the aminocarboxylate analogues, the metal ion bonding mode is basically bidentate with P-Glu and tridentate with P-Asp. However, the more basic character of the -PO32? group than that of the -COO- group leads to an enhanced formation of various protonated complexes. PO32?/COO? substitution in the alpha-position results in a more marked ambidentate character of P-Asp in the copper(II) complexes than does that in the beta-position.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 155 : 2 (1989), p. 281-287. -
További szerzők:Farkas Etelka (1948-) (vegyész) Kozlowski, Henryk
Pályázati támogatás:OTKA 240/86
OTKA
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10.

001-es BibID:BIBFORM085981
Első szerző:Santos, Amelia M.
Cím:Erratum to: "Transition metal complexes of two new imino-dihydroxamic acids" / M. Amélia Santos, Raquel Grazina, Margarida Pinto, Etelka Farkas
Dátum:2002
ISSN:0020-1693
Tárgyszavak:Természettudományok Kémiai tudományok hozzászólás
folyóiratcikk
Megjelenés:Inorganica Chimica Acta. - 329 : 1 (2002), p. 155-155. -
További szerzők:Grazina, Raquel Pinto, Margarida Farkas Etelka (1948-) (vegyész)
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11.

001-es BibID:BIBFORM032036
Első szerző:Szabó Orsolya (vegyész)
Cím:Characterization of Mn(II) and Mn(III) binding capability of natural siderophores desferrioxamine B and desferricoprogen as well as model hydroxamic acids / Orsolya Szabó, Etelka Farkas
Dátum:2011
ISSN:0020-1693
Megjegyzések:Complexes formed between Mn(II) ion and acetohydroxamic acid (HAha), benzohydroxamic acid (HBha),N-methyl-acetohydroxamic acid (HMeAha), DFB model dihydroxamic acids (H2(3,4-DIHA), H2(3,3-DIHA),H2(2,5-DIHA), H2(2,5-H,H-DIHA), H2(2,4-DIHA), H2(2,3-DIHA)) and two trihydroxamate based naturalsiderophores, desferrioxamine B (H4DFB) and desferricoprogen (H3DFC) have been investigated underanaerobic condition (and some of them also under aerobic condition). The pH-potentiometric resultsshowed the formation of well-defined complexes with moderate stability. Monohydroxamic acids not,but all of the dihydroxamic acids and trihydroxamic acids were able to hinder the hydrolysis of the metalion up to pH ca. 11. Maximum three hydroxamates were found to coordinate to the Mn(II) ion, but presenceof water molecule in the inner-sphere was also indicated by the corresponding relaxivity valueseven in the tris-chelated complexes. Moreover, prototropic exchange processes were found to increasethe relaxation rate of the solvent water proton over the value of [Mnaqua]2+ in the protonated Mn(II)?siderophore complexes at physiological pH. The much higher stability of Mn(III)?hydroxamate(especially tris-chelated) complexes compared to the corresponding Mn(II)-containing species resultsin a significantly decreased formal potential compared to the Mn(III)aqua/Mn(II)aqua system. As a result,air oxygen becomes an oxidizing agent for these manganese(II)?hydroxamate complexes above pH 7.5.The oxidation processes, followed by UV?Vis spectrophotometry, were found to be stoichiometric onlyin the case of the tris-chelated complexes of siderophores, which predominate above pH 9. ESI-MSprovided support about the stoichiometry and cyclic-voltammetry was used to determine the stabilityconstants for the tris-chelated complexes, [Mn(HDFB)]+ and [MnDFC].OTKA-NKTH CK77586
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Hydroxamic acids
Siderophores
Manganese(II)/(III) complexes
Solution equilibria
Redox behaviour
Relaxivity
Megjelenés:Inorganica Chimica Acta. - 376 : 1 (2011), p. 500-508. -
További szerzők:Farkas Etelka (1948-) (vegyész)
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