Abstract
A compound of formula [Mn(hfac) 2NITpPy] 2, where hfac = hexafluoroacetylacetonato and NITpPy = (2- (4-pyridyl)-4,4,5,5-tetramethyl-imidazoline-l-oxyl-3-oxide), was synthesized. The X-ray analysis showed that it crystallizes in the monoclinic P2 1/ n group with a = 10.995(2), b=15.378(2), c= 17.990(3) Å, β = 106.58(1)°, and Z= 2. The manganese ions are octahedrally coordinated by the four oxygen atoms of the hfac ligands, an oxygen of a nitronyl nitroxide radical, and the pyridine nitrogen of another radical, related by the inversion center to the first one, thus yielding a dinuclear structure. The uncoordinated NO groups are at short distances from the ones translated along the a axis. The magnetic data suggested that in the four spins system the antiferromagnetic interaction between manganese and radical through the NO group dominates and that a weak ferromagnetic interaction through the pyridine might be responsible for the diamagnetic ground state. The analysis however is not unambiguous due to the presence of short contacts between radicals.
Published Version
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