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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and crystal structure of two synthetic oxofluoride framework compounds - Co _2TeO _3F _2 and Co _2SeO _3F _2
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Synthesis and crystal structure of two synthetic oxofluoride framework compounds - Co _2TeO _3F _2 and Co _2SeO _3F _2

机译:两种合成的氟代氟化物骨架化合物Co _2TeO _3F _2和Co _2SeO _3F _2的合成及晶体结构

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摘要

Two new isostructural Co ~(2+) containing tellurium and selenium oxofluoride compounds Co _2TeO _3F _2 and Co _2SeO _3F _2 are synthesized and their structures determined by single crystal X-ray diffraction. They crystallize in the orthorhombic space group Pnma with the unit cell parameters a = 7.3810(5) ?, b = 10.1936(7) ?, c = 5.3013(3) ? and a = 7.2655(8) ?, b = 10.0013(13) ?, c = 5.3564(6) ?, respectively. The Co(ii) ion has octahedral coordination [CoO _3F _3] and builds up a 3D framework by corner- and edge sharing. The Se(iv) and the Te(iv) ions have the coordinations [SeO _3E] and [TeO _3E] respectively where E is the lone-pair electrons. The Se(iv) and Te(iv) ions are isolated from each other and bond only to the [CoO _3F _3] polyhedra. The electronegative element fluorine takes the role of a network builder like oxygen and helps to form the 3D framework structure. This is a difference compared to many oxohalide compounds containing Cl and Br where the halide ions are terminating ions preventing a 3D network from being formed. Long range antiferromagnetic interactions dominate at temperatures < 20 K. The magnetic susceptibility follows the Curie-Weiss law above 25 K with the Curie constant C = 5.62 emu K mol ~(-1), the Weiss temperature = -56 K and the effective magnetic moment μ _(eff) = 4.74 μ _B per cobalt atom.
机译:合成了两个新的同结构的Co〜(2+)含碲和氧氟化硒化合物Co _2TeO _3F _2和Co _2SeO _3F _2,并通过单晶X射线衍射确定了它们的结构。它们在正交晶空间群Pnma中结晶,其晶胞参数为a = 7.3810(5),b = 10.1936(7),c = 5.3013(3)。 a = 7.2655(8)Ω,b = 10.0013(13)Ω,c = 5.3564(6)Ω。 Co(ii)离子具有八面体配位[CoO _3F _3],并通过边角和边共享建立了3D框架。 Se(iv)和Te(iv)离子分别具有[SeO _3E]和[TeO _3E]的配位,其中E是孤对电子。 Se(iv)和Te(iv)离子彼此隔离,仅与[CoO _3F _3]多面体键合。负电性元素氟具有像氧气一样的网络构造剂的作用,有助于形成3D框架结构。与许多含有Cl和Br的卤代卤化合物相比,这是一个区别,在卤代离子中,卤化物离子是终止离子,阻止了3D网络的形成。在<20 K的温度下,长距离反铁磁相互作用起主导作用。磁化率遵循居里-魏斯定律(高于25 K),居里常数C = 5.62 emu K mol〜(-1),魏斯温度= -56 K,有效磁每个钴原子的矩μ_(eff)= 4.74μ_B。

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