Hou Shou-Zeng, Cao Deng-Ke, Liu Xun-Gao, Li Yi-Zhi, Zheng Li-Min
State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, PR China.
Dalton Trans. 2009 Apr 21(15):2746-50. doi: 10.1039/b818809b. Epub 2009 Feb 20.
Hydrothermal reaction of (4-carboxypiperidyl)-N-methylenephosphonic acid (4-cpmpH3) and zinc sulfate results in compound Zn(O3PCH2-NHC5H9-COO) (). It has a pillared layered structure in which the inorganic layers made up of corner-sharing {CPO3} and {ZnO4} tetrahedra are connected by the organic groups. When cobalt sulfate is allowed to react with 4-cpmpH3 under similar conditions, a proportion of the ligands undergo decarboxylation, leading to the formation of a novel mixed ligated compound Co3(O3PCH2-NHC5H9-COO)2(O3PCH2-NC5H10)(H2O) (). Compound also shows a pillared layered structure with the topology of the inorganic layer similar to that of . The CoII ions in are all tetrahedrally coordinated. Significant difference between the two structures lies in the packing of the layers, e.g....AAA... in while ...AABAAB... in . More interestingly, compound behaves as a metamagnet at low temperature. The critical field is 40.1 kOe at 1.8 K.
（4-羧基哌啶基）-N-亚甲基膦酸（4-cpmpH3）与硫酸锌的水热反应生成化合物Zn(O3PCH2-NHC5H9-COO) （）。它具有柱状层状结构，其中由共用角的{CPO3}和{ZnO4}四面体组成的无机层通过有机基团相连。当硫酸钴在类似条件下与4-cpmpH3反应时，一部分配体发生脱羧反应，导致形成一种新型混合配位化合物Co3(O3PCH2-NHC5H9-COO)2(O3PCH2-NC5H10)(H2O) （）。化合物也呈现出柱状层状结构，其无机层的拓扑结构与的类似。中的CoII离子均为四面体配位。这两种结构的显著差异在于层的堆积方式，例如，中为...AAA...，而中为...AABAAB...。更有趣的是，化合物在低温下表现为变磁体。在1.8 K时临界场为40.1 kOe。
