Field-Induced Slow Relaxation in a Monometallic Manganese(III) Single-Molecule Magnet

High-field electron paramagnetic
resonance spectroscopy shows that the structurally distorted MnIII ion in Na5[Mn­(l-tart)2]·12H2O (1; l-tart = l-tartrate)
has a significant negative axial zero-field splitting and a small
rhombic anisotropy (∼1% of D). Alternating-current
magnetic susceptibility measurements demonstrate that 1, which contains isolated MnIII centers, displays slow
relaxation of its magnetization under an applied direct-current magnetic
field.

高场电子顺磁共振波谱法（High-field electron paramagnetic resonance spectroscopy）测试显示，Na₅[Mn(L-酒石酸根)₂]·12H₂O（化合物1；L-tart即L-酒石酸根（l-tartrate））中发生结构畸变的三价锰（MnIII）离子存在显著的负轴向零场分裂，以及幅值约为参数D的1%的微弱菱形各向异性。交流磁化率（Alternating-current magnetic susceptibility）测量结果表明，该含有孤立三价锰（MnIII）中心的化合物1，在外加直流磁场（direct-current magnetic field）条件下展现出磁化慢弛豫行为。