In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2010, No. 3 ( 2010-01), p. 483-489
Abstract:
The reaction between Mn(ClO 4 ) 2 · 6H 2 O, Et‐saoH 2 (Et‐saoH 2 = 2‐hydroxypropiophenone oxime), NEt 4 OH and [Ni(pao) 2 (py) 2 ] (paoH = 2‐pyridylaldoxime) in MeOH forms the complex [Mn III 3 O(Et‐sao) 3 (HCO 2 )(MeOH) 5 ] ( 1 ) in good yields. The reaction of MnCl 2 · 4H 2 O, Me‐saoH 2 (Me‐saoH 2 = 2‐hydroxyphenylethanone oxime), NEt 4 OH and dl ‐valine in MeOH gives the complex [Mn III 3 O(Me‐sao) 3 (MeOH) 5 ]Cl ( 2 ) in moderate yields. In both complexes the building block consists of a triangular {Mn III 3 O(R‐sao) 3 } unit (R = Et, Me for 1 and 2 , respectively). In the case of 2 , the [Mn 3 ] 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 [Mn 3 ] oximate complexes on the basis of “flat” and “twisted” torsion angles and the effect of the auxiliary ligands.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2010:3
DOI:
10.1002/ejic.200900905
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
1475009-0
Permalink