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"Naked" [Mn3O]7+ triangles: the effect of auxiliary ligands on magnetic exchange.
Autorzy
Rok wydania
2010
Czasopismo
European Journal of Inorganic Chemistry
Numer woluminu
2010
Strony
483-489
DOI
10.1002/ejic.200900905
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The reaction between Mn(ClO4)2·6H2O, Et-saoH2 (Et-saoH2 = 2-hydroxypropiophenone oxime), NEt4OH and [Ni(pao)2(py)2] (paoH = 2-pyridylaldoxime) in MeOH forms the complex [MnIII3O(Et-sao)3(HCO2)(MeOH)5] (1) in good yields. The reaction of MnCl2·4H2O, Me-saoH2 (Me-saoH2 = 2-hydroxyphenylethanone oxime), NEt4OH and dl-valine in MeOH gives the complex [MnIII3O(Me-sao)3(MeOH)5]Cl (2) in moderate yields. In both complexes the building block consists of a triangular {MnIII3O(R-sao)3} unit (R = Et, Me for 1 and 2, respectively). In the case of 2, the [Mn3] unit can be considered “naked” as there is no capping ligand present, whereas in the case of 1 a formate ion is terminally bonded to one metal centre. DC magnetic susceptibility measurements for 1 and 2 reveal the presence of both ferromagnetic and antiferromagnetic intramolecular interactions, depending on the Mn–N–O–Mn torsion angles within each cluster, leading to a ground state S = 2 for both complexes. Rationalization of this result is attempted by structural comparison of previously reported triangular [Mn3] oximate complexes on the basis of “flat” and “twisted” torsion angles and the effect of the auxiliary ligands.
Słowa kluczowe
manganese, oximes, magnetic properties, ligand effects
Adres publiczny
http://dx.doi.org/ 10.1002/ejic.200900905
Strona internetowa wydawcy
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