Magnetic Properties of a Linear Trinuclear Manganese Compound [Mn3(PhCO2)6(Bipy)2]·H2O~1

摘要

The reaction of the trinuclear oxo-centered mixed-valence complex [Mn3O(O2CPh)6(Py)2(H2O)] with 2,2'-bipyridyl (Bipy) and another potential tripodal ligand affords the title compound [Mn3(PhCO2)6(Bipy)2]·H2O in good yield. The X-ray crystallographic diffraction study reveals that three man-genese ions are arranged in a linear mode with Mn_(center)-Mn_(terminal) and Mn_(terminal)-Mn_(teiminal) diatances of 3.588 and 7.176 A, respectively. Molar magnetic susceptibility of the compound gradually decreases from 12.23 (300 K) to 4.45 cm~3 K mol~(-1) (2 K). Taking into account the structure of this compound, the data in the 2.0-300 K range were fit to the appropriate theoretical expression to give J = -2.73 cm~(-1), p= 2.07%, N_a = -0.0004 cm~3 mol~(-1), g = 1.992, and R~2 = 0.99996. The magnetization versus external magnetic field measurements at 2 K shows that the ground state is S_T = 5/2.