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001-es BibID:	BIBFORM089148
Első szerző:	Erre Strinna, Liliana
Cím:	Molecular structure and spectral properties of bis(2,6-dimethoxybenzoato)(2,2': 6',2''-terpyridine)manganese(II): a five-coordinate Mn(II) complex / Liliana Strinna Erre, Giovanni Micera, Eugenio Garribba, Attila Cs. Bényei
Dátum:	2000
ISSN:	1144-0546 1369-9261
Megjegyzések:	The mixed complex formed by Mn(ii), 2,6-dimethoxybenzoate (dmb) and 2,2':6',2"-terpyridine (terpy) was isolated in the solid state and characterised by single crystal X-ray diffraction, IR and EPR, and thermogravimetric analysis. The complex is fivefold co-ordinated with a geometry shifted toward the limiting form of the trigonal bipyramid. Two carboxylate groups and the central nitrogen atom of terpy occupy the equatorial plane, while the distal nitrogen atoms are in the axial positions. The normalised bite, the angle formed by distal nitrogen (N-d and N-d) atoms at the metal ion, the manganese-nitrogen distances, and the tilt angles between the pyridine rings were compared with those of other terpyridine complexes. Owing to the large dimensions of the Mn(ii) ion, the distortions observed in the N-d-Mn-N-d angles and in those between the pyridine rings are the largest so far observed with first-row transition metal ions. The metal-central nitrogen and metal-distal nitrogens distances are longer than with other metal ions.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	New Journal of Chemistry. - 24 : 9 (2000), p. 725-728. -
További szerzők:	Micera, Giovanni Garribba, Eugenio Bényei Attila (1962-) (vegyész)
Internet cím:	DOI Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM079611
035-os BibID:	(WoS)000412639800022 (Scopus)85030979850
Első szerző:	Matyuska Ferenc
Cím:	Control of structure, stability and catechol oxidase activity of copper(II) complexes by the denticity of tripodal platforms / Ferenc Matyuska, Nóra V. May, Attila Bényei, Tamás Gajda
Dátum:	2017
ISSN:	1144-0546 1369-9261
Megjegyzések:	Copper(II) complexes of a new polydentate tripodal ligand trenpyz (L, tris[2-(5-pyrazolylmethyl)aminoethyl]- amine) were characterized in both solution and solid states. A combined evaluation of potentiometric UV-Vis and EPR data provided both thermodynamic and structural information on the complexes formed in solution. In equimolar solution the highly stable square pyramidal CuHL and trigonal bipyramidal CuL are the dominant species at around pH 3 and 5?8, respectively. Above pH 8 further deprotonation was observed (pK = 9.56), which is related to the formation of a copper(II)-bound pyrazolate anion. This creates the possibility for the formation of oligonuclear complexes, through pyrazolate bridges, and at a 3/2 Cu(II)/L ratio three trinuclear complexes were identified, similar to the copper(II)-tachpyz (N,N0 ,N00-tris(5-pyrazolylmethyl)-1,3,5-cis,cis-triamino-cyclohexane) system studied earlier. The trinuclear complexes of the two ligands have considerably different speciations, due to the different denticities of tripodal platforms. At the optimal pH the catechol oxidase activities of the triply deprotonated trinuclear complexes of trenpyz and tachpyz are similar, but the pH-rate constant profiles are significantly different, as a consequence of the deviations in their speciation. Consequently, the H2dtbc oxidation promoted by these trinuclear complexes can be easily controlled by the denticity of the tripodal ligands, since it affects the coordination environment of the central metal ion, which is proposed to be the main actor during the reaction.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	New Journal Of Chemistry. - 41 : 20 (2017), p. 11647-11660. -
További szerzők:	May Nóra Veronika Bényei Attila (1962-) (vegyész) Gajda Tamás
Pályázati támogatás:	GINOP-2.3.2-15-2016-00038 GINOP OTKA 101541 OTKA OTKA 115762 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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