Synthesis, structure, and magnetic properties of a hexanuclear manganese complex

The reaction of 1-(2-pyridyl)-3-(p-tolyl)propane-1,3-dione (HL) with [Mn3O(O2CPh)6(H2O)(py)2] in CH2Cl2 affords a mixed-valence Mn3IIMn3III hexanuclear complex [Mn6O2(O2CPh)8L3] (1). Complex 1 contains a [Mn3IIMn3III(μ4-O)2]11+ core, which is a new structural type in the family of Mn6 complexes. Variable temperature magnetic susceptibility and magnetization measurement of complex 1 have been carried out. The magnetic data indicate that complex 1 has a ground state spin value of S = 7/2 with significant magnetoanisotropy as gauged by the D value of −0.46 cm−1. The frequency dependence of the out-of-phase component in alternating current magnetic susceptibilities for complex 1 indicates the slow magnetic relaxation of a superparamagnetic molecule.

A mixed-valence Mn3IIMn3III hexanuclear [Mn6O2(O2CPh)8L3] (1) complex has been synthesized by the reaction of 1-(2-pyridyl)-3-(p-tolyl)propane-1,3-dione (HL) with [Mn3O(O2CPh)6(H2O)(py)2] in CH2Cl2. The magnetic data indicate that complex 1 has an S = 7/2 with the D value of −0.46 cm−1 and slow magnetic relaxation below 2.5 K.Figure optionsDownload as PowerPoint slide