Divalent manganese linked tungsten-molybdenum polyoxometalates: Synthesis, structure, and magnetic characteristics

作者：Zhang Xiutang; Dou Jianmin; Wang Daqi; Zhang Yuexing; Zhou Yang; Li Renjie; Yan Shishen; Ni Zhonghai; Jiang Jianzhuang^*

来源：Crystal Growth & Design, 2007, 7(9): 1699-1705.

DOI：10.1021/cg060723f

Three novel tungsten-molybdenum polyoxometalate compounds, namely H2.5K2[Mn-1.,5W5.65Mo1.35O24(H2O)4]Cl-1.5 degrees 6H(2)O (1), H5K2Na[Mn-2(H2O)(6)(H2W9.52Mo2.48O42)]Cl-2 center dot 20H(2)O (2), and Na-2[Mn-4(H2O)(14)(H2W12O42)]center dot 16H(2)O (3), were prepared and characterized by elemental analysis and IR spectroscopy. Single-crystal X-ray diffraction analyses reveal their three-dimensional network composed of a framework Of M7O246- or H2M12O4210- (M = W or W/Mo) linked via divalent manganese cations Mn(H2 O)(n)(2+) (n = 2-4), with the help of potassium for 1 and 2. Magnetic measurements reveal that all the three compounds 1-3 show paramagnetic properties with a magnetic moment about the single Mn2+ cation, indicating very weak anti ferromagnetic coupling between the neighboring Mn2+ cations in these three-dimensional architectures.

• 出版日期2007-9
• 单位山东大学; 聊城大学