Physico-Chemical nanomaterials science

Nanosized Na9[Eu(W5O18)2]·35H2O: synthesis and investigation
Mariichak O.Yu., Rozantsev G.M., Radio S.V.
Educational and Scientific Institute of Chemistry, Vasyl' Stus Donetsk National University. Vul. 600-richchia, 21, Vinnytsia-21021, Ukraine.
E-mail: o.marijchak@donnu.edu.ua

The Eu3+ based polyoxometalate (POM), [Eu(W5O18)2]9–, is clearly the most studied among Ln–containing polyoxotungstates and applied in functional luminescence and optical materials [1]. The ability of POMs to be soluble in a wide range of mixed aqueous-organic solvents allows to use them for the fabrication of stable films with nanostructured organization [2]. That’s why it is important to elaborate new procedure for the synthesis and investigate the formation of the compound with [Eu(W5O18)2]9– anion.
In present study, the conditions for the synthesis of nanosized sodium heteropoly decatungstoeuropiate(III) Na9[Eu(W5O18)2]·35H2O from acidified up to Z=0.80 aqueous solution of sodium tungstate with ratio of ν(Eu):ν(W)=1:10 from water-acetone media were established.
By FT-IR and FT-Raman spectroscopy it was shown that the anion in the synthesized salt belong to Peacock-Weakley type of structure. Single Crystal X-ray analysis determined the structure parameters of synthesized salt. The main crystallographic data are: triclinic, space group P–1 with a=12.928(4), b=13.064(4), c=21.427(6); α=101.04(3), β=103.43(3), γ=103.03(3); V=3313.75(18) Å3, M=3333.37 g/mol, and Z=2.
The spontaneous formation of Na9[Eu(W5O18)2]·35H2O through a simple ionic self-assembly (ISA) method was investigated by using UV-Vis spectroscopy. The results of Scanning Electron Microscopy confirmed single-phase of the synthesized salt and found out that the grain size of Na9[Eu(W5O18)2]·35H2O is within the range of 250–550 nm.
Acknowledgements. The study was carried out within the Fundamental Research Programme funded by the MES of Ukraine (Project No. 0116U002521).

1.	Yamase T. Chapter 243 Luminescence of polyoxometallolanthanoates and photochemical nano-ring formation, in: K.A. Gschneidner, Jr., J.-C.G. Bünzli, V.K. Pecharsky (Eds.), Handbook on the Physics and Chemistry of Rare Earths. -Elsevier.-2009.-P. 297-356.
2.	Granadeiro C.M., de Castro B., Balula S.S., Cunha-Silva L. Lanthanopolyoxometalates: From the structure of polyanions to the design of functional materials // Polyhedron.-2013.-52.-P. 10-24.