关键词: 钨铝硅酸钾, 三取代杂多化合物, 晶体结构, 异构体

Abstract: The title complex was obtained from α-SiW₉. The crystal structure determination shows that the complex crystallizes in the monoclinic space group P2₁/α with α= 1. 0996 nm, b=3. 9181nm, c=1. 1987 nm, β= 114. 30°, D_c= 3. 60 g/cm³, Z=4, the final R= 0.081, and the SiW₉O₃₄in 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 W₂O₁₀by sharing a edge of octahedra, completing a pseudo-Keggin unit. K⁺ions and crystal water molecules lie in between the anions.

Key words: Potassium aluminotungstosilicate, Trisubstituted heteropoly complex, Crystal structure, Isomer