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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Synthesis and structure of two forms of ammonium monomolybdate (NH4)(2)MoO4 [German]
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Synthesis and structure of two forms of ammonium monomolybdate (NH4)(2)MoO4 [German]

机译:两种形式的单钼酸铵(NH4)(2)MoO4的合成与结构[德语]

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Ammonium monomolybdate (NH4)(2)MoO4 exists in two different polymorphic forms which differ in their lattice constants and in the arrangement of the ammonium cations relative to the molybdate anions. The ammonium molybdates (NH4)(2)MoO4(mS60)(1)) and (NH4)(2)MoO4(mP60)(2)) are synthesized by the reaction of ammonia and (NH4)(6)[MO7O24]. 4H(2)O (NH4)(2)MoO4(mS60) crystallizes isostructural to the potassium compound in space group C2/m (Nr. 12) and lattice constants a=1263.6(3), b= 652.2(1) pm, c = 776.4(2) pm and beta= 117.36(1)degrees (V = 568.3(2).10(6) pm(3)) containig four formula units per unit cell (R = 0.0250). (NH4)(2)MoO4(mP60) crystallizes monoclinic in space group P2(1) (Nr. 14) and lattice constants a = 622.8(2), b=777.0(1) pm, c=1118.8(4)pm and beta=98.09(2)degrees (V= 536.0(3).10(6) pm(3)) (R = 0.0205). The different arrangements of the polyhedra within the unit cell is caused by hydrogen bridges. A transition point was not yet determined. [References: 9]
机译:单钼酸铵(NH4)(2)MoO4以两种不同的多晶型形式存在,它们的晶格常数和铵阳离子相对于钼酸根阴离子的排列方式不同。钼酸铵(NH4)(2)MoO4(mS60)(1))和(NH4)(2)MoO4(mP60)(2))是通过氨与(NH4)(6)[MO7O24]反应合成的。 4H(2)O(NH4)(2)MoO4(mS60)结晶成空间组C2 / m(Nr.12)中的钾化合物同构,晶格常数a = 1263.6(3),b = 652.2(1)pm, c = 776.4(2)pm和beta = 117.36(1)度(V = 568.3(2).10(6)pm(3))每个单元格包含四个公式单位(R = 0.0250)。 (NH4)(2)MoO4(mP60)在空间群P2(1)/ n(Nr.14)中结晶为单斜晶,晶格常数a = 622.8(2),b = 777.0(1)pm,c = 1118.8(4) pm和beta = 98.09(2)度(V = 536.0(3).10(6)pm(3))(R = 0.0205)。晶胞内多面体的不同排列是由氢桥引起的。过渡点尚未确定。 [参考:9]

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