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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Three new acid M M + + arsenates and phosphates with multiply protonated As/PO 4 4 groups
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Three new acid M M + + arsenates and phosphates with multiply protonated As/PO 4 4 groups

机译：三种新的酸M m + +酸酯和磷酸盐，常压AS / PO 4 4组

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摘要

The crystal structures of caesium dihydrogen arsenate(V) bis[trihydrogen arsenate(V)], Cs(H 2 AsO 4 )(H 3 AsO 4 ) 2 , ammonium dihydrogen arsenate(V) trihydrogen arsenate(V), NH 4 (H 2 AsO 4 )(H 3 AsO 4 ), and dilithium bis(dihydrogen phosphate), Li 2 (H 2 PO 4 ) 2 , were solved from single‐crystal X‐ray diffraction data. NH 4 (H 2 AsO 4 )(H 3 AsO 4 ), which was hydrothermally synthesized ( T = 493?K), is homeotypic with Rb(H 2 AsO 4 )(H 3 AsO 4 ), while Cs(H 2 AsO 4 )(H 3 AsO 4 ) 2 crystallizes in a novel structure type and Li 2 (H 2 PO 4 ) 2 represents a new polymorph of this composition. The Cs and Li compounds grew at room temperature from highly acidic aqueous solutions. Li 2 (H 2 PO 4 ) 2 forms a three‐dimensional (3D) framework of PO 4 tetrahedra sharing corners with Li 2 O 6 dimers built of edge‐sharing LiO 4 groups, which is reinforced by hydrogen bonds. The two arsenate compounds are characterized by a 3D network of AsO 4 groups that are connected solely via multiple strong hydrogen bonds. A statistical evaluation of the As—O bond lengths in singly, doubly and triply protonated AsO 4 groups gave average values of 1.70?(2)?? for 199 As—OH bonds, 1.728?(19)?? for As—OH bonds in HAsO 4 groups, 1.714?(12)?? for As—OH bonds in H 2 AsO 4 groups and 1.694?(16)?? for As—OH bonds in H 3 AsO 4 groups, and a grand mean value of 1.667?(18)?? for As—O bonds to nonprotonated O atoms.
机译：铯二氢化铯（V）双[三氢砷酸酯（V）]，Cs（H 2 ASO 4）（H 3 ASO 4）2，二氢砷酸铵（V）三氢砷酸酯（V），NH 4（H.从单晶X射线衍射数据求解2ASO 4）（H 3 ASO 4）和铝双（磷酸二氢），Li 2（H 2 PO 4）2。 NH 4（H 2 ASO 4）（H 3 ASO 4），其水热合成（T = 493〜K），是官分的RB（H 2 ASO 4）（H 3 ASO 4），而Cs（H 2 ASO 4）（H 3 ASO 4）2以新颖的结构型结晶，Li 2（H 2 PO 4）2表示该组合物的新多晶型物。来自高度酸性水溶液的Cs和Li化合物在室温下增长。 Li 2（H 2 PO 4）2形成了具有Li 2 O 6二聚体的PO 4 Tetrahedra共用角的三维（3D）框架，其由边缘共享LiO 4组构建，由氢键加强。两种砷化物化合物的特征在于ASO 4基团的3D网络，其仅通过多个强氢键连接。单独，双层和三重质子化ASO 4组的AS-O键长度的统计评估给出了1.70？（2）的平均值对于199个AS-OH债券，1.728？（19）??对于哈索4组的AS-OH键，1.714？（12）??在H 2 ASO 4组和1.694中的AS-OH键？（16）??对于H 3 ASO 4组的AS-OH键，宏观平均值为1.667？（18）??对于非普促的O原子的AS-O键。

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