一种具有Keggin结构的固体杂多酸的合成及其晶体结构

以钨酸钠、氯化钴、醋酸钴及1,3-丙二胺为原料,利用水热合成法制备了一种具有Keggin结构的杂多酸H6CoW12O40].2.5H2O;利用单晶X射线衍射分析了产物的晶体结构.结果表明,产物中的过渡金属Co2+离子作为中心原子与4个氧原子形成CoO4四面体;CoO4四面体被4个W3O13金属簇包围,与每个W3O13金属簇之间通过共顶点连接而形成CoW12O40]6-阴离子;六个氢离子作为抗衡阳离子,最终形成固体杂多酸分子.

Synthesis and crystal structure of a solid heteropolyacid

A Keggin-type solid heteropolyacid,H6CoW12O40]·2.5H2O,was hydrothermally prepared from Na2WO4·2H2O,CoCl2,Co（CH3COO）2 and propylene-1,3-diamine as the starting materials in aqueous solution.The crystal structure of as-synthesized product was characterized by single-crystal X-ray diffraction.It has been found that transition metal Co2＋ in as-synthesized product acts as the central atom to coordinate with four O atoms forming a CoO4 tetrahedron which is surrounded by four W3O13 groups via side-sharing,forming CoW12O40]6-anion.Besides,the six H atoms act as the counter cations giving rise to the molecule of title solid hereropolyacid.