Yang Ting-Hai, Cai Zhong-Sheng, Shi Fa-Nian, Zheng Li-Min
School of Chemistry & Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China.
Dalton Trans. 2015 Nov 28;44(44):19256-63. doi: 10.1039/c5dt03050a. Epub 2015 Oct 21.
Two novel metal pyridylmethylphosphonates, namely, [Co(4-pmp)] (1) and [Cu(4-pmp)(H2O)] (2), (4-pmpH2 = 4-pyridylmethylphosphonic acid), have been hydrothermally synthesized and characterized by X-ray diffraction, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. In compound 1, each {PO3C} tetrahedron is corner-shared with three {CoNO3} tetrahedra and vice versa, thus forming a one-dimensional (1-D) inorganic chain along the a axis containing 8-membered rings of [(Co-O-P-O)2]. The inorganic chains are further connected by a 4-pmp(2-) ligand, generating a 2-D layered structure. Compound 2 displays a three-dimensional (3-D) framework structure, in which the inorganic layers are pillared by the pyridyl groups of the ligand, generating a 3-D pillared-layered structure. The magnetic properties of 1 and 2 have been studied. Compounds 1 and 2 behave as metamagnets at low temperature. The critical fields are about 70 kOe for 1 and 47 kOe for 2 at 1.8 K.
水热合成了两种新型金属吡啶甲基膦酸盐，即[Co(4-pmp)]（1）和[Cu(4-pmp)(H₂O)]（2）（4-pmpH₂ = 4-吡啶甲基膦酸），并通过X射线衍射、红外光谱、元素分析和热重分析对其进行了表征。在化合物1中，每个{PO₃C}四面体与三个{CoNO₃}四面体共用顶点，反之亦然，从而沿a轴形成一维（1-D）无机链，其中包含[(Co-O-P-O)₂]的八元环。无机链通过4-pmp(2-)配体进一步连接，形成二维层状结构。化合物2呈现三维（3-D）骨架结构，其中无机层由配体的吡啶基团支撑，形成三维柱状层状结构。研究了1和2的磁性能。化合物1和2在低温下表现为变磁体。在1.8 K时，化合物1的临界场约为70 kOe，化合物2的临界场约为47 kOe。
