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Titolo:
Synthesis, structure, electrochemistry, and magnetism of [(MnMnIII)-Mn-III], [(MnFeIII)-Fe-III] and [(FeFeIII)-Fe-III] cores: Generation of phenoxyl radical containing [(FeFeIII)-Fe-III] species
Autore:
Verani, CN; Bothe, E; Burdinski, D; Weyhermuller, T; Florke, U; Chaudhuri, P;
Indirizzi:
Max Planck Inst Strahlenchem, D-45470 Mulheim, Germany Max Planck Inst Strahlenchem Mulheim Germany D-45470 70 Mulheim, Germany Univ Gesamthsch Paderborn, D-33098 Paderborn, Germany Univ Gesamthsch Paderborn Paderborn Germany D-33098 8 Paderborn, Germany
Titolo Testata:
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
fascicolo: 8, , anno: 2001,
pagine: 2161 - 2169
SICI:
1434-1948(200108):8<2161:SSEAMO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRYSTAL-STRUCTURE; MANGANESE(IV) COMPLEXES; COORDINATION CHEMISTRY; ENZYME CATALYSIS; GROUND-STATE; OXIDATION; LIGANDS; SALICYLALDOXIME; COBALT(III); GALACTOSE;
Keywords:
N,O ligands; electrochemistry; manganese; iron; radicals; magnetic properties;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Chaudhuri, P Max Planck Inst Strahlenchem, Stiftstr 34-36, D-45470 Mulheim, Germany Max Planck Inst Strahlenchem Stiftstr 34-36 Mulheim Germany D-45470
Citazione:
C.N. Verani et al., "Synthesis, structure, electrochemistry, and magnetism of [(MnMnIII)-Mn-III], [(MnFeIII)-Fe-III] and [(FeFeIII)-Fe-III] cores: Generation of phenoxyl radical containing [(FeFeIII)-Fe-III] species", EUR J INORG, (8), 2001, pp. 2161-2169

Abstract

Neutral homo- and heterobinuclear complexes with the general formula [(tmtacn)M-A(salox)(3)M-B] where M-A (Mn-III or Fe-III) is facially coordinated to the cyclic amine 1,4,7-trimethyl-1,4,7-triazacyclononane (tmtacn) and M-B (Mn-III or Fe-III) is coordinated to the azomethine nitrogens and phenolate oxygens of the bridging ligand, salicylaldoxime, thus yielding MAN3O3 and MBN3O3 cores. The compounds were characterized by IR, UV/Vis, mass spectrometry, Mossbauer spectroscopy, electrochemistry, and variable-temperature (2-295 K) magnetic susceptibility measurements. The molecular structures ofthe compounds [(tmtacn)Fe-III(salox)(3)Fe-III] (3) and {(tmtacn)Fe-III (tBuSalox)(3)Fe-III} (4) were established by X-ray diffraction, Three oximate groups -HC=N-O bridge the metal centers with Fe . . . Fe separations of 3.571(1) and 3.486(1) Angstrom for (3) and (4), respectively. Analysis of the susceptibility data yields antiferromagnetic interactions between the metalcenters for the complexes (FeFeIII)-Fe-III and Mn-III-Fe-III, but a ferromagnetic interaction for (MnMnIII)-Mn-III. The electrochemistry of all complexes was investigated in detail. For the complexes (FeFeIII)-Fe-III. (3) and (4) a series of reversible one-electron transfer waves leads to the formation of the cations [Fe-2](1+/2+/3+) that are attributed to the generation of salox-based phenoxyl radicals.

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Documento generato il 02/10/20 alle ore 01:51:19