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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Hydroflux Synthesis and Characterization of the Non- Centrosymmetric Oxomanganate(V) KSrMnO_4
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Hydroflux Synthesis and Characterization of the Non- Centrosymmetric Oxomanganate(V) KSrMnO_4

机译：氢化产物合成和表征非亚光糖尿metOmanganate（v）ksrmno_4

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摘要

Bluish-green crystals of the oxomanganate(V) KSrMnO_4 were synthesized under hydroflux conditions with KOH at about 200 °C starting from KMnO_4 and Sr(NO_3)_2. The product formation depends on the hydroxide concentration and the strontium-manganese ratio of the starting materials. By changing these parameters, also other reaction products, such as α-SrMnO_3 and Sr_5[MnO_4]_3OH, are obtained. KSrMnO_4 crystallizes in the non-centrosymmetric orthorhombic space group P2_12_12_1 with a = 743.26(7) pm, b = 575.72(6) pm and c =987.2(1) pm. The crystal structure consists of isolated [MnO_4]_3- tetrahedra surrounded by Sr~(2+) and K~+ cations. The group-subgroup relation to KBaMnO_4 and to the aristotype α-K_2SO_4 are discussed. UV/Vis spectra and magnetic data agree with the oxidation state +V of manganese. KSrMnO_4 is paramagnetic, but orders as an antiferromagnet below 4.6(1) K. Thermal analysis of KSrMnO_4 revealed the decomposition at about 950 °C to α-SrMnO_3.
机译：以KMnO_4和Sr（NO_3）2为起始原料，在约200°C的KOH条件下，在氢射流条件下合成了氧锰酸根（V）KSrMnO_4的蓝绿色晶体。产物的形成取决于原料的氢氧化物浓度和锶锰比。通过改变这些参数，还可以得到其他反应产物，如α-SrMnO_3和Sr_5[MnO_4]_3OH。KSrMnO_4在非中心对称正交空间群P2_12_12_1中结晶，a=743.26（7）pm，b=575.72（6）pm，c=987.2（1）pm。晶体结构由孤立的[MnO_4]_3-四面体组成，四面体周围有Sr~（2+）和K~+阳离子。讨论了KBaMnO_4与α-K_2sou4的群-子群关系。紫外可见光谱和磁性数据与锰的氧化态+V一致。KSrMnO_4为顺磁性，但在4.6（1）K以下为反铁磁体。KSrMnO_4的热分析显示，在约950°C下分解为α-SrMnO_3。

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