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一种新的三维网状硼钒酸盐K_4[(VO)_(12)O_6B_(18)O_(38)(OH)_4]·6(H_3O)·17H_2O的水热合成和晶体结构

Hydrothermal Synthesis and Crystal Structure of a Novel 3-D Complex K_4[(VO)_(12)O_6B_(18)O_(38)(OH)_4]·6(H_3O)·17H_2O
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摘要 以V2O5,H3BO3,KSCN,NH2CH2CH2NHCH2CH2OH,CuCl.H2O和H2O为原料,按物质的量比1∶5∶2∶2∶2∶500在180℃条件下晶化,得到黑色块状晶体K4[(VO)12O6B18O38(OH)4].6(H3O).17H2O。单晶结构分析结果表明该化合物属正交晶系,Pbca空间群,晶胞参数a=1.9193(4)nm,b=1.8415(4)nm,c=1.9231(4)nm,V=6.797(2)nm3,Z=4,R=0.0564,WR2=0.1649。该化合物的结构主要由阴离子簇[(VO)12O6B18O38(OH)4]10-构成。该阴离子簇由B18O38(OH)4十八元环夹在两个以共边方式交替相连形成的V6O18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,结构中阴离子簇通过与K离子形成的静电引力以及分子间的大量氢键相互连接,形成三维网状结构。价态计算结果表明,结构中n(VⅣ):n(VⅤ)=8:4。 A hydrothermal reaction of V2O5, H3 BO3, KSCN, NH2CH2CH2NHCH2CH2OH, CuCI -H2O and H2O in a molar ratio of 1 : 5: 2: 2: 2:500 gives a black block crystal K4 [ (VO) 1206B18O38( OH)4 ] ·6 (H3O)·17H2O. It crystallizes in a orthorhomhic system with space group Pbca and unit cell parameters a=1.9193(4)nm,b=1.8415(4)nm,c = 1.9231(4)nm, V=6.797(2)nm3,Z=4,R=0.0564, WR2 = 0.1 649. The structure consists of a [ (VO) 12 06 B is O3s ( OH ) 4 ] 10- cluster, which is connected by K^+ through K-O ionic bond and plenty of hydrogen bonds to form a 3-dimension net structure. The [ (VO)12O6 B18O38( OH ) 4 ]^10 - cluster consists of a puckered B is O38(OH ) 4 ring sandwiched between two triangles of six edge-sharing vanadium atoms. The oxidation states of vanadium in the compound are V ( Ⅳ ) and V ( Ⅴ ) in a molar ratio of 8: 4.
机构地区 福州大学化学系
出处 《人工晶体学报》 EI CAS CSCD 北大核心 2007年第6期1334-1338,共5页 Journal of Synthetic Crystals
基金 福建省教育厅资助项目(JB05019)
关键词 水热合成 晶体结构 簇合物 硼矾酸盐 hydrothermal synthesis crystal structure cluster compound vanadium borate
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