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001-es BibID:	BIBFORM112581
035-os BibID:	(WoS)000359537000017 (Scopus)84939134153
Első szerző:	Bogdándi Virág
Cím:	Kinetics of the oxidation of isoniazid with the hypochlorite ion / Virág Bogdándi, Gábor Lente, István Fábián
Dátum:	2015
ISSN:	2046-2069
Megjegyzések:	The stoichiometry and kinetics of the reaction between isoniazid (isonicotinic hydrazide, INH) and the hypochlorite ion was studied in a basic aqueous medium (pH > 10) by spectrophotometric, hydrogen-1 nuclear magnetic resonance, electrospray mass spectrometric and stopped-flow methods. At oxidant excess, the sole organic product was confirmed to be isonicotinic acid. At isoniazid excess, a coupled condensation product formed from isoniazid and isonicotinic acid was also detected in relatively high amounts. The stoichiometric ratio of the two reactants (INH/OCl ) was 0.46 or 0.67 depending on which of the reagents was in excess initially. Under all conditions, the rate determining step of the overall reaction was confirmed to be the rapid bimolecular reaction between the neutral from of isoniazid and the anionic hypochlorite ion. The second order rate constant of the process was estimated to be (3.4 0.7) 104 M 1 s 1 at 25.0 C.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk isoniazid hypochlorous acid kinetics mechanism
Megjelenés:	RSC Advances. - 5 : 83 (2015), p. 67500-67508. -
További szerzők:	Lente Gábor (1973-) (vegyész) Fábián István (1956-) (vegyész)
Pályázati támogatás:	4.2.2.A-11/1/KONV-2012- 0043 TÁMOP OTKA-105156 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM082931
Cím:	Temperature- and pressure-dependent kinetico-mechanistic studies on the formation of mixed-valence {(tetraamine)CoIIINCFeII(CN)5}- units / Alcázar Laura, Bogdándi Virág, Lente Gábor, Manuel Martínez, Marta Vázquez
Dátum:	2015
ISSN:	0095-8972
Megjegyzések:	The reduction of CoIII in the tetraamine-encapsulating ligand complex [CoIII{(?-ET)(Me2)cyclen}(H2O)2]3+ by [FeII(CN)6]4? has been studied kinetico-mechanistically at different pH, temperatures, and pressures. The process agrees with the expected outer-sphere redox mechanism, with the value of the encounter-complex equilibrium constant large enough to allow for kinetic determination of the first-order electron transfer reaction rate constant. The value of the encounter-complex equilibrium constant, Kpre-eq, is not only dependent on the charge of the redox partners, but also on the establishment of an important network of hydrogen bonds. These can also explain the differences obtained in the activation volumes determined for the diaqua and bis-hydroxo complexes. Neither the leaching of CoII nor the presence of [FeIII(CN)6]3? is observed in the final reaction medium, which indicates that a fast sequence involving substitution on the transient CoII complex followed by a fast inner-sphere electron transfer takes place. This sort of mechanism has already been established for encapsulating pentaamine ligand complexes, but this is the first example of such a sequential reaction occurring on a tetradentate ligand complex. Preliminary UV?Vis and electrochemical characterization experiments have been conducted on the final reaction mixtures, suggesting the formation of a stable cyanide-bridged CoIII/FeII mixed-valence complex of the same type reported in the literature for encapsulating {CoIII(N)5} skeletons.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Redox Mechanisms Mixed-valence Kinetics
Megjelenés:	Journal Of Coordination Chemistry. - 68 : 17-18 (2015), p. 3058-3068. -
További szerzők:	Alcázar Laura Bogdándi Virág Lente Gábor (1973-) (vegyész) Martínez, Manuel Vázquez, Marta
Pályázati támogatás:	TÁMOP-4.2.4.B/2-11/1-2012-0001 TÁMOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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