A new family of polyoxometalate compounds built up of Preyssler anions and trivalent lanthanide cations

Four new polyoxometalate compounds built on Preyssler anions and trivalent lanthanide cations, Na2[{Ce(H2O)8}4{Na(H2O)P5W30O110}] · 12H2O (1), H4Na4[Nd2(H2O)14{Na(H2O)P5W30O110}] · 22H2O (2), K2Na[Eu3(H2O)14(HNA)3{Eu(H2O)P5W30O110}] · 3H2O (3 NA = nicotinic acid) and H2[Ce4(H2O)16(HNA)6{Na(H2O)P5W30O110}] · 12H2O (4) have been synthesized and characterized by elemental analysis, IR, TG and single crystal X-ray diffraction. Compound 1 exhibits a tetrasupporting polyoxometalate cluster structure where four {Ce(H2O)8}3+ fragments are supported on the [Na(H2O)P5W30O110]14− cluster. Compound 2 shows a one-dimensional chain structure built from [Na(H2O)P5W30O110]14− clusters linked by Nd3+ cations. Compound 3 displays a one-dimensional chain structure constructed of [Eu(H2O)P5W30O110]12− clusters bridged by Eu3+ cations. Compound 4 has a 2D network formed by View the MathML source[Ce2(H2O)10{Na(H2O)P5W30O110}]n8n-1D chains and {Ce2(H2O)6(HNA)6}6+ linkers. Compounds 2–4 represent the first extended structures based on Preyssler anions. In addition, the fluorescent activity of compound 3 is reported.