Department of Materials Science and Metallurgy, The University of Cambridge, Cambridge CB2 3QZ, UK.
Chemistry. 2010 Jul 5;16(25):7579-85. doi: 10.1002/chem.201000390.
An anhydrous manganese succinate, Mn(C(4)H(4)O(4)), has been synthesised hydrothermally and studied by single-crystal X-ray diffraction. It adopts a succinate pillared structure in which layers of corner-sharing MnO(6) octahedra alternate with sheets that contain chains of edge-sharing octahedra. This unique 3D framework structure contains highly distorted MnO(6) octahedra, which are made possible by the lack of ligand field stabilisation energy for the high-spin Mn(2+) ion. Attempts to dope the structure with other divalent transition-metal ions were accordingly unsuccessful. Magnetic susceptibility and heat capacity measurements indicate that Mn(C(4)H(4)O(4)) undergoes antiferromagnetic ordering below 12 K, with a second antiferromagnetic transition at approximately 6 K. These two antiferromagnetic phases undergo further transitions in applied fields, underlining the subtle magnetic behaviour that is possible in inorganic-organic frameworks of this structural complexity.
一水合琥珀酸锰，Mn(C(4)H(4)O(4))，通过水热法合成，并通过单晶 X 射线衍射进行了研究。它采用琥珀酸柱撑结构，其中角共享 MnO(6)八面体层与包含边缘共享八面体链的薄片交替排列。这种独特的 3D 骨架结构包含高度扭曲的 MnO(6)八面体，这是由于高自旋 Mn(2+)离子缺乏配体场稳定能所致。因此，尝试用其他二价过渡金属离子掺杂该结构的尝试均未成功。磁化率和热容测量表明，Mn(C(4)H(4)O(4))在 12 K 以下经历反铁磁有序，在大约 6 K 时经历第二次反铁磁转变。这两个反铁磁相在施加的磁场下进一步转变，强调了在这种结构复杂性的无机-有机骨架中可能存在的微妙磁行为。
