Nanocomposites and nanomaterials

Synthesis and research of lanthanide-containing hybrid materials based on POSS
Berezhnytska O.S.1,2, Ivakha O.B.1,2, Smola S.S.3, Trunova O.K.1
1 V.I.Vernadsky Institute of General and Inorganic Chemistry of NAS of Ukraine, Akad. Palladin Avenue, 32/34, Kyiv-03142, Ukraine. 
E-mail: olekberez@gmail.com
2 National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 37, Prosp. Peremohy, Kyiv -03056, Ukraine.
3 A.V. Bogatsky Physico-Chemical Institute NASU, 86, Lustdorf road, Odessa- 65000, Ukraine.
High luminescent properties of lanthanides cause increased interest in them by researchers. There are a number of strict requirements for modern luminescent materials: high mechanical stability, chemical inertness, thermal stability, high and stable spectral-luminescent characteristics. Unfortunately, metal complexes not fully meet these requirements, so there is a need to modify them.
One of the ways to solve this problem is to obtain hybrid materials. Grafting complexes on the matrix, which forms the spatial structure, can cause an increase in luminescence intensity due to the antenna effect of the matrix.
As a matrix can be proposed polyhedral oligomeric silsesquioxanes (POSS), alkyl-substituted trialcocysilanes, cellulose derivatives, methyl methacrylate and others. Aimed at synthesizing materials using different carriers and ratios allows to obtain compounds with specified properties. The process of fixing complexes on the matrix can occur in two ways. Physical processes there are deposition, spraying, adsorption or dispersion of the complex on the carrier, or chemically by covalent fixation of the complexes on the carrier. In this paper, we consider the production of hybrid structures by covalent fixation of lanthanide complexes on a functionalized matrix. 
Some diketonates containing unsaturated substituents in chelate rings was synthesis, namely: Ln(mphpd)3, Ln(dmhpd)3, Ln(dmod)3, Ln(bphhpd)3 (Ln - Nd (III), Yb(III)). The composition and structure of complexes were determined by the methods of IR and fluorescence spectropy, SDV, ESP and DTA analysis. Шt is shown that these materials show a high luminescence intensity, which allows their use as precursors of luminescent materials