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Inne
Syntheses, structures and magnetic properties of azido- and phenoxo-bridged complexes of manganese containing tridentate aroylhydrazone based ligands.
Autorzy
Rok wydania
2013
Czasopismo
Numer woluminu
61
Strony
45-55
DOI
10.1016/j.poly.2013.05.033
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Five new compounds have been prepared by the reaction of MnCl2·4H2O with aroylhydrazone in the presence of NaN3: [Mn(L1)(N3)(HOCH3)]2 (1), [Mn(L2)(N3)(HOCH3)]2 (2), [Mn(L3)(N3)(HOCH3)0.75(EtOH)0.25]2 (3), [Mn(L4)(N3)(HOCH3)]2 (4) and [Mn2(L2)2(HOCH3)2]n (5). (HL1 = (E)-3-hydroxy-N′-(1-(pyridin-2-yl)ethylidene)-2-naphthohydrazide, HL2 = (E)-N′-(phenyl(pyridin-2-yl)methylene)furan-2-carbohydrazide, H2L3 = (Z)-N′-(4-oxo-4-phenylbut-2-en-2-yl)isonicotinohydrazide, H2L4 = (E)-N′-(5-bromo-2-hydroxybenzylidene)isonicotinohydrazide). In absence of NaN3 the mononuclear complex [Mn(H2L5)2(EtOH)2Cl2] (6) was obtained by the reaction of MnCl2·4H2O and H2L5 ((E)-N′-(2-hydroxy-3-methoxybenzylidene)isonicotinohydrazide). All the compounds have been characterized by elemental analyses, IR spectra, single crystal X-ray diffraction and magnetic susceptibility measurements. Compound 6 exhibits mononuclear structure, 1–4 dinuclear structure whereas complex 5 yields two-dimensional sheets parallel to the (1 0 0) plane in which the deprotonated H2L4 act as bridging ligand. The magnetic study reveals dominating antiferromagnetic interactions in 1 and 5 whereas the ferromagnetic coupling dominates in 2–4. The magnetic properties are interpreted in terms of the electronic structure of the Mn ions and structural parameters.
Słowa kluczowe
Dinuclear Mn complexes, Magnetic behavior, azide, coordination polymer, hydrazones
Adres publiczny
http://dx.doi.org/10.1016/j.poly.2013.05.033
Strona internetowa wydawcy
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