K5[FeO4] und K17[Fe5O16]: Zwei neue Kalium-Oxoferrate(III) / K5[FeO4] and K17[Fe5O16]: Two New Potassium Oxoferrates(III)
K5[FeO4] und K17[Fe5O16]: Zwei neue Kalium-Oxoferrate(III) / K5[FeO4] and K17[Fe5O16]: Two New Potassium Oxoferrates(III)
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K5[FeO4] 和 K17[Fe5O16]：Zwei neue 氧铁酸钾 (III) / K5[FeO4] 和 K17[Fe5O16]：两种新的氧铁酸钾 (III)
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Röhr
中科院分区：
文献类型：
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作者：
Gero Frisch;C. Röhr
标题化合物是由富钾的Fe 2 O3、元素钾和过氧化氢KO 2的混合物通过应用短的反应时间、875 K的最高温度和随后的样品淬灭来合成的。通过单晶X射线衍射测定了两个新的铁氧酸盐的结构。正铁酸盐（III）K5[FeO 4]（Na 5 [GaO 4]结构类型，空间群Pbca，a = 1124，0（2），B = 667，95（9），c = 2034，8（3）pm，Z = 4，R1 = 0，0585）显示孤立的邻位阴离子[FeO 4]5−，具有接近理想的四面体几何形状，Fe-O距离在189至192 pm的窄范围内。五铁酸钾K17[Fe_5 O_（16）]（空间群Cm，a = 671，71（5），B= 3560，8（3），c= 670，81（5）pm，β = 119，687（5）°，Z =2，R_1 = 0，0291）具有一种新的结构类型。它的结构单元是由五个角共享[FeO 4]四面体组成的孤立的新型五核阴离子。这些线性链片[Fe 5 O 16]以六边形棒包装排列，堆叠顺序根据|：AB：|沿着大的单斜B轴。因此，该结构与具有可比较的四核高铁酸盐（III）阴离子的堆积的四高铁酸盐K14[Fe 4 O 13]的结构相关。
The title compounds were synthesized from potassium rich mixtures of Fe2O3, elemental potassium and the hyperoxide KO2 by applying short reaction times, a maximum temperature of 875 K and subsequent quenching of the samples. The structures of the two new oxoferrates(III) have been determined by single crystal X-ray diffraction. The orthoferrate(III) K5[FeO4] (Na5[GaO4] structure type, space group Pbca, a = 1124,0(2), b = 667,95(9), c = 2034,8(3) pm, Z = 4, R1 = 0,0585) exhibits isolated ortho-anions [FeO4]5− with nearly ideal tetrahedral geometry and Fe-O distance in the narrow range of 189 to 192 pm. The pentaferrate K17[Fe5O16] (space group Cm, a = 671,71(5), b=3560,8(3), c=670,81(5) pm, β =119,687(5)°, Z =2, R1=0,0291) crystallizes with a new structure type. Its building units are isolated novel penta-nuclear anions composed of five corner sharing [FeO4] tetrahedra. These linear chain pieces [Fe5O16] are arranged in a hexagonal rod packing, with a stacking sequence according to |:AB:| along the large monoclinic b axis. The structure is thus related to that of the tetra-ferrate K14[Fe4O13] with a comparable packing of tetra-nuclear ferrate(III) anions.