Title
Yttrium‐Containing Sandwich‐, Ring‐, and Cage‐Type Polyoxovanadates: Synthesis and Characterization
Author
Tatsuya Maruyama, Hiroko Kawabata, Yuji Kikukawa, Yoshihito Hayashi
Year
2018
Journal
European Journal of Inorganic Chemistry
Abstract
By the reaction of Y(NO3)3 and {Et4N}[VO3] in organic media, yttrium‐containing polyoxovanadates are synthesized and classified into sandwich‐type {Et4N}5[Y(H2O)n(V4O12)2] (1, n = 0–2), ring‐type {Et4N}6[Y(V9O27)] (2), and cage‐type {Et4N}8[Y4(OH)4V20O58] (3). Both compounds 1 and 2 contain a mononuclear yttrium cation. A yttrium cation in 1 is sandwiched by two [V4O12]4–, while that in 2 is surrounded by a single [V9O27]9– ring. In acetonitrile, both species 1 and 2 are formed simultaneously. The dominant species in solution are controlled by the presence of additives. The addition of an excess amount of pyridine drives the formation of 1, while in the presence of water or {Et4N}[VO3], the formation of 2 is preferable. Compound 3 possesses a cubane‐type tetranuclear yttrium core, [Y4(OH)4]8+, wrapped by a polyoxovanadate framework. The spherical polyoxovanadate framework of 3 exhibits new types of inorganic coordination ligands and can include a cubane unit in the framework. The vanadate framework of 3 consists of condensed [V11O33]11– rings sharing three‐coordinate VO4 units as a bridgehead, as in an adamantane framework.
Instrument
FP-8700
Keywords
Fluorescence, Photoluminescence, Inorganic chemistry, Optical properties