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Synthesis and Structural Characterization of Sandwich‐Type Keggin‐γ‐Lacunary Silicotungstates with an Open Wells–Dawson‐Like Structure
Author(s) -
Liu Hongsheng,
Peng Jun,
Su Zhongnin,
Chen Yanhui,
Dong Baoxia,
Tian Aixiang,
Han Zhangang,
Wang Enbo
Publication year - 2006
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200600717
Subject(s) - chemistry , lacunary function , orthorhombic crystal system , isomerization , crystallography , cluster (spacecraft) , imidazole , aqueous solution , structure type , transition metal , crystal structure , inorganic chemistry , stereochemistry , catalysis , organic chemistry , mathematics , pure mathematics , computer science , programming language
Three novel [γ‐SiW 10 O 36 ] 8– dimers, [{K(H 2 O)} 2 {(μ 3 ‐H 2 O)M(H 2 O)}(γ‐Si 2 W 20 O 70 )] 8– (M = Mn 2+ , 1 ; Co 2+ , 2 ; Ni 2+ , 3 ), are isolated from an aqueous acidic medium without isomerization, which is different from most reactions of [γ‐SiW 10 O 36 ] 8– with first‐row transition metals. They are isomorphous and crystallize in the orthorhombic system, space group Pnma . These species are the first examples of imidazole–potassium mixed salts of Keggin‐γ‐type dimers having an analogous open structure related to the Wells–Dawson anionic cluster. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)