Synthesis and magnetic properties of one-dimensional metal oxalate networks as molecular-based magnets
[摘要] The homo- and heteropolymetallic assemblies of MMâ€�?(OX)2(H2O)4, where MMâ€�? represents MnMn, CoMn, NiMn, CuMn, CoCo, NiCo, CuCo, NiNi, CuNi, and CuCu; and the respective complexes, numbered 1â€�??10, have been prepared by reacting metal(II) saltsâ€�?�i.e. of Mn, Co, Ni, and Cuâ€�?�and potassium oxalate monohydrate in hot water (90â€�??100°C). The magnetic susceptibility data of the complexes 8 and 9 in the 300 Kâ€�??20 K temperature range obeys the Curieâ€�?�Weiss law and exhibits Weiss constants â€�?? 50 K and â€�?? 100 K, respectively. On lowering the temperature, the effective magnetic moment decreases gradually and is indicative of antiferromagnetic phase transition. The complexes have also been characterized by ES mass spectrometry, infrared (IR), electronic, and electron spin resonance (ESR) spectra.
[发布日期] [发布机构]
[效力级别] [学科分类] 材料工程
[关键词] Molecular-based magnets;magnetic properties;one-dimensional metal oxalate;synthesis and structure of metal-oxalates. [时效性]
