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以 V2 O5,Na2 B4O7· 1 0 H2 O,Na H2 PO4· 2 H2 O,乙二胺和 H2 O为原料 ,按物质的量比 0 .5∶ 1∶ 1∶2 .2 4∶ 1 1 1在 1 80℃条件下晶化 ,得到棕色晶体 Na2 [( VO) 1 2 O6 B1 8O39( OH) 3]· ( 1 1 H3O)· 4 H2 O.单晶结构分析结果表明该化合物属单斜晶系 ,P2 1 / n空间群 ,晶胞参数 a=1 .38970 ( 8) nm,b=1 .661 5 9( 9) nm,c=1 .4 2 74 8( 8) nm,β=95 .691 0 ( 1 0 )°. Z=4 ,R=0 .0 5 4 9.该化合物的结构主要由阴离子簇[( VO) 1 2 O6 B1 8O39( OH) 3]1 3 -构成 .该阴离子簇由 B1 8O39( OH) 3十八元环夹在两个以共边方式交替相连形成的V6 O1 5簇中间 ,通过共用氧原子形成三明治式结构新颖的硼 -钒 -氧阴离子簇 ,结构中 Na+以离子键方式将阴离子簇相互连接 ,形成二维层状结构 .层与层之间通过分子间氢键相互作用 .价态计算结果表明 ,结构中n( V )∶ n( V ) =5∶ 1
Using V2 O5, Na2 B4O7 · 1 0 H 2 O, Na H 2 PO 4 · 2 H 2 O, ethylenediamine and H 2 O as raw materials, the ratio of the materials is 0 .5: 1: 1: 2. 2: 4: 1 1 1 Crystallization was carried out at 180 ℃ to obtain brown crystal Na2 [(VO) 1 2 O6 B1 8O39 (OH) 3] · (1 1 H3O) · 4 H2 O. The single crystal structure analysis showed that the compound is monoclinic , The space group P2 1 / n, the unit cell parameters a = 1.38970 (8) nm, b = 1.661 5 9 (9) nm, c = 1.4274 8 .691 0 (1 0) °. Z = 4, R = 0 .0 5 4 9. The structure of this compound is mainly composed of anionic clusters [(VO) 1 2 O6 B1 8O39 (OH) 3] The anion cluster is composed of B18O39 (OH) 3 eighteen-membered rings sandwiched between two V6 O1 5 clusters alternately connected in a common side manner. The common oxygen atoms form a sandwich structure with novel boron-vanadium-oxygen anion clusters. The structure In Na + ion clusters, anionic clusters are connected to each other to form a two-dimensional layered structure. The intermolecular hydrogen bonding interaction between layers leads to the formation of n (V): n (V) = 5: 1