Abstract
Abstract Two new supramolecular polyoxometalate compounds [Ag 2 (mbpy) 3 ][Ag(mbpy) 2 ][PW 12 O 40 ] ( 1 ) and [Ag 2 (mbpy) 3 ] 2 [SiW 12 O 40 ] ( 2 ) (mbpy=4,4'-dimethyl-2,2'-dipyridyl), have been hydrothermally synthesized and characterized by IR, TG, and single-crystal X-ray diffraction techniques. The structural feature of 1–2 is in the cationic moiety of a tetra-core {Ag 4 } cluster through weak Ag…Ag interactions. The silver(I) centers show three-, four- and five-coordinated geometries. In 1 the tetrameric silver atoms in {[Ag 2 (mbpy) 3 ] 2 } 4+ covalently bind to [PW 12 O 40 ] 3− anion via Ag3O bonds, while there is only intermolecular hydrogen bonding between {[Ag 2 (mbpy) 3 ] 2 } 4+ and [SiW 12 O 40 ] 4− in 2 . The coordination environments of the tetrameric silver cations have a great influence on the structure richness of the Keggin-based hybrids. The fluorescence properties of compounds 1 and 2 also have been discussed.
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