Spectroscopic Studies of Polyoxometalates and their Complexes with Lanthanide(III) Ions in Solution

Abstract

The results of investigations related to physico-chemical properties, synthesis and structure of polyoxometalates and their lanthanide(III) complexes are briefly reviewed. Useful techniques for the verifrcation of polyoxometalate compositions and the determination of components are compared. Complexation of metal ions, especially of lanthanide(III) ions, with polyoxometalates using absorption (in the UV-visible and the near IR region) and luminescence spectroscopy methods are presented. Absorption hypersensitive transitions of certain lanthanide(III) ions and laser-induced europium(III) ion luminescence spectroscopy are shown to be useful in complexation investigations. The significance of some polyoxometalate complexes as potential magnetic resonance imaging agents and in biological studies as antiviral agents are discussed.

A Survey of Applications of Polyoxometalates

“…Lanthanide-containing POM complexes exhibit electroluminescence properties that make them attractive candidates for optoelectronic applications …”

Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non‐aqueous solutions

“…POMs with alkali counter cations such as Na + , K + and NH + 4 are well water-soluble compositions. They can be solved in solvents of different polarity, depending on the kind of the counter cation occurring in the POM molecule [1][2][3][4]. Generally POMs can be categorized into three structural groups, depending on the coordination number of the heteroatom [1,2].…”

“…They can be solved in solvents of different polarity, depending on the kind of the counter cation occurring in the POM molecule [1][2][3][4]. Generally POMs can be categorized into three structural groups, depending on the coordination number of the heteroatom [1,2]. Our previous studies concerned synthesis of POMs and their Ln(III) complexes, representing the three structural groups of POMs and additionally so-called inorganic analogues of crown-ethers and cryptands (e.g.…”

“…Preyssler's anion). They have been characterized using spectroscopic methods both in aqueous [2,[5][6][7][8] and non-aqueous solutions [9]. Some of LnPOM complexes show interesting and effective luminescence properties, i.e.…”

Synthesis and spectroscopic characterisation of chosen heteropolyanions and their Ln(III) complexes containing tetrabutylammonium counter ion

“…Among many polyoxoanions (POMs) [1][2][3][4][5] [9,10]. The significance and interest of these lanthanide heteropolyanions relates to their potential antiretroviral activity and applications in catalysis [2,3,8,11].…”