Synthesis,Structure,and Magnetic Properties of a New Cobalt Selenite Ca_2Co(HSeO_3)_2(SeO_3)_2

• 作 者: 徐锦秋 项红萍 张素允 汤莹莹 郭文彬 王琳 何长振
• 机 构: State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter
• 出 处: 结构化学
• 发表日期: 2016年10期
• 关键词: chains hydrothermal triclinic magnetization ordering cobalt Curie octahedral sep

A new cobalt selenite,Ca_2Co(HSeO3)_2(SeO_3)_2,was synthesized by a conventional hydrothermal method. Single-crystal X-ray diffraction analysis reveals that Ca_2Co(HSeO3)_2(SeO_3)_2 crystallizes in triclinic system,space group P1,with a = 5.330(5),b = 7.047(7),c = 8.457(9) ?,V = 285.0(5) ?~3,Z = 1,Mr = 646.93,Dc = 3.769,μ = 15.235 mm~(-1),F(000) = 299.0,the final R = 0.0452 and wR = 0.1169 for observed 1265 reflections with I > 2σ(I). The title compound consists of isolated chains built from CoO_6 octahedra and SeO_3 pyramids. In this structure,the chains are separated by Ca~(2+) cations. Magnetic measurements confirm that the title compound exhibits long-range antiferromagnetic ordering at 3 K and field-induced magnetic transition at 2 T.

A new cobalt selenite, Ca_2Co (HSeO3) _2 (SeO_3) _2, was synthesized by a conventional hydrothermal method. Single-crystal X-ray diffraction analysis reveals that Ca_2Co (HSeO3) _2 (SeO_3) _2 crystallizes in triclinic system, space group P1 , with a = 5.330 (5), b = 7.047 (7), c = 8.457 (9) Å, V = 285.0 (5) Å ~ 3, Z = 1, Mr = 646.93, Dc = 3.769, μ = 15.235 mm (-1), F (000) = 299.0, the final R = 0.0452 and wR = 0.1169 for observed 1265 reflections with I> 2σ (I). The title compound consists of an isolated chain built from CoO_6 octahedra and SeO_3 pyramids. In This structure, the chains are separated by Ca ~ (2+) cations. Magnetic measurements confirm that the title compound exhibits long-range antiferromagnetic ordering at 3 K and field-induced magnetic transition at 2T.