摘要
三取代杂多化合物的母体XM_9是由Keggin结构阴离子XM_(12)衍生而来.它有2种异构体:从XM_(12)中移出1个M_3O_(13)基团得B型异构体;从XM_(12)中的3个M_3O_(13)中各移出1个MO_6后得到A型异构体.Hervé等人曾指出α-和β-SiW_9均为B型结构,但Robert等在测定β-Na_9H(SiW_9O_(34))·23H_2O的晶体结构时发现,β-SiW_9为A型结构,α-SiW_9结构类型尚未定论,由于2种构型阴离子的配位能力及聚合能力不同,确定其结构类型及其变化情况是十分必要的,本文由α-SiW_9合成了α-K_3H_4[SiW_9A1_3(H_2O)_3O_(37)],用X射线衍射法测定了其晶体结构。
The title complex was obtained fromα-SiW9. The crystal structure determination shows that the complex crystallizes in the monoclinic space group P21/α withα= 1. 0996 nm, b=3. 918J nm, c=1. J987 nm, β= 1H. 30°, Dc = 3. 60 g/cm3, Z=4, the final R= 0.081, and the SiW9O34 in the complex is A-αa-type tri-lacuna heteropoly anion. Three Al atoms fill into the lacunas linking each other by sharing a corner of the octahedra AlO5(H2O) and with three W2O10 by sharing a edge of octahedra, completing a pseudo-Keggin unit. K+ ions and crystal water molecules lie in between the anions.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第8期1009-1011,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
杂多化合物
钨铭硅酸钾
晶体结构
Potassium aluminotungstosilicate, Trisubstituted heteropoly complex, Crystal structure, Isomer
