Synthesis, structure and magnetic properties of oxo-centered trinuclear manganese complex [Mn_3O(O_2CC_3H_7)_6(C_5H_5N)_3] centre dot ClO_4

摘要

The reaction of N-n-Bu_4MnO_4 with Mn(OAc)_2.4H_2O, pyridine and butyric acid in absolute EtOH leads to the high-yield formation of the oxo-centered trinuclear Mn complex, [Mn_3O(O_2CC_3H_7)_6(C_5H_5N)_3].ClO_4. The complex crystallizes in orthorhombic, space group Pna2_1 with a=19.588(7), b=20.194(6), c=12.491(5) A. Variable temperature solid state magnetic susceptibility study shows that the antiferromagnetic exchange interaction is weak, and the exchange integral J=-12.36 cm~(-1).