Twisting, bending, stretching: strategies for making ferromagnetic [MnIII3] triangles
Twisting, bending, stretching: strategies for making ferromagnetic [MnIII3] triangles
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DOI：
10.1039/b911820a
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发表时间：
2009-01-01
影响因子：
4
通讯作者：
Brechin, Euan K.
中科院分区：
文献类型：
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作者：
Inglis, Ross;Taylor, Stephanie M.;Brechin, Euan K.
本文报道了一个大家族的三金属[Mn-3（III）]单分子磁体的合成和表征。所报道的配合物可分为三类，其通式为（1）[（Mn_3 O）-O-III（R-sao）（3）（X）（sol）（3-4）]（其中R = H、Me、Bu-t; X = -O2 CR（R = H、Me、Ph等）; sol = py和/或H2O），（类型2）[（Mn 3 O）-O-III（R-sao）（3）（X）（sol）（3-5）]（其中R = Me、Et、Ph、Bu-t; X = -O2 CR（R = H、Me、Ph等）;溶胶= MeOH、EtOH和/或H2O）和（类型3）[（Mn 3 O）-O-III（R-sao）（3）（溶胶）（3）（XO 4）]（其中R = H、Et、Ph、萘;溶胶= py、MeOH、beta-pic、Et-py、Bu-t-py; X = Cl、Re）。我们表明，故意的分子结构扭曲可以用来调整所观察到的磁性。在晶体中，铁磁三角形参与广泛的分子间氢键，这在磁行为中清楚地表现出来，产生交换偏置的SMM。这些相互作用可以通过配体置换来去除，以得到“更简单的”SMM。
The synthesis and characterisation of a large family of trimetallic [Mn-3(III)] Single-Molecule Magnets is presented. The complexes reported can be divided into three categories with general formulae (type 1) [(Mn3O)-O-III(R-sao)(3)(X)(sol)(3-4)] (where R = H, Me, Bu-t; X = -O2CR (R = H, Me, Ph etc); sol = py and/or H2O), (type 2) [(Mn3O)-O-III(R-sao)(3)(X)(sol)(3-5)] (where R = Me, Et, Ph, Bu-t; X = -O2CR (R = H, Me, Ph etc); sol = MeOH, EtOH and/or H2O), and (type 3) [(Mn3O)-O-III(R-sao)(3)(sol)(3)(XO4)] (where R = H, Et, Ph, naphth; sol = py, MeOH, beta-pic, Et-py, Bu-t-py; X = Cl, Re). We show that deliberate structural distortions of the molecule can be used to tune the observed magnetic properties. In the crystals the ferromagnetic triangles are involved in extensive inter-molecular H-bonding which is clearly manifested in the magnetic behaviour, producing exchange-biased SMMs. These interactions can be removed by ligand replacement to give "simpler" SMMs.