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在氮气氛下,由硫酸氧钒与氢氧化钠的水溶液作用制得的暗红色晶体属四方晶系,空间群为D_(2d)~8-Pn2,晶胞参数a=21.3 75(12),c=14.494(6).经晶体结构分析证实,晶胞中有以四重反轴相联系的四个聚缩十八钒酸根的存在;每个簇阴离子[V_(18)O_(42)]~(12-)呈笼形结构,由钒氧四方锥配位体聚集而成,其中的氧原子有18个是以复键与钒原子相结合的端氧,其余24个均为与三个钒原子相键连的叉氧原子;每个笼的中心位置还为一个被包合的水分子所占据.晶体对应的化学式确证为Na_(12)V_(18)O_(42)·24H_2O.
Under nitrogen atmosphere, the dark red crystals obtained from the aqueous solution of vanadyl sulfate and sodium hydroxide belong to the tetragonal crystal system, the space group is D 2d-8-Pn 2, the unit cell parameters are a = 21.375 (12), c = 14.494 (6) .According to the crystal structure analysis, there are four poly (18 ± vanadate) ~ (12-) has a cage structure and is formed by the aggregation of vanadyl tetragonal ligands. Among them, there are 18 oxygen atoms which are oxygen bonded to the vanadium atom and the remaining 24 are all bonded to three (12) V 18 O 42 (42H 2 O). The corresponding chemical formula of the crystal is confirmed to be Na 12 O 18 (42) 24H 2 O.