Syntheses, Crystal Structures And Properties Of The Lanthantde-containing Monovacant Heteropolymolybdate Coordination Compounds

The synthetic strategy is mainly the one-pot synthesis procedure. The different reactionconditions were investigated. Finally, six new compounds based on the vacantheteropolymolybdates have been obtained in aqueous solution. The structures of sixheteropolymolybdates have been ascertained by several characterizations. Thephotoluminescence, magnetic property and surface photovoltage property of the compoundshave been investigated.1. Na₂MoO₄·2H₂O, GeO₂, rare-earth salts, CuCl₂were used as the reactants. The organicligand ethylenediamine was introduced to the reaction system. In the conventional aqueoussolution, four new lanthanide-containing germanomolybdates were isolated by rationalone-pot synthetic procedure.H(C₂N₂H₁₀)₅[Cu（C₂N₂H₈）₂][Eu(GeMo₁₁O₃₉)₂]·11H₂O（C₂N₂H₈=ethylenediamine）（1）H(C₂N₂H₁₀)₅[Cu（C₂N₂H₈）₂][Ce(GeMo₁₁O₃₉)₂]·13H₂O （2）(C₂N₂H₁₀)₅.5[Cu（C₂N₂H₈）₂][Pr(GeMo₁₁O₃₉)₂]·10H₂O （3）(C₄H₁₀NO)₁₃[Ce(GeMo₁₁O₃₉)₂]·11H₂O （C₄H₉NO=morpholine）（4）In compound1，the sandwich-type [Eu(GeMo₁₁O₃₉)₂]^13-polyanions are alternativelylinked by two crystallographic independent [Cu（C₂N₂H₈）₂]²⁺fragments to form aone-dimensional chain. In compound2，the [Ce(GeMo₁₁O₃₉)₂]^13-polyanions are connected byone independent [Cu（C₂N₂H₈）₂]²⁺fragment to form a dimer structure.2. Na₂MoO₄·2H₂O, GeO₂, Ce（NO₃）₃, CuCl₂were used as the reactants. The ethylenediaminewas also used as the ligand. The pH value of the reaction system was raised. One newtrivacant germanomolybdate-based compound5was synthesized in the conventional aqueoussolution.(C₂N₂H₁₀)₃[Cu（C₂N₂H₈）₂]₃[Cu₂(GeMo₉O₃₃)₂]·19H₂O （5）In compound5，the [Cu₂(GeMo₉O₃₃)₂]^12-polyanions are alternatively linked by two[Cu（C₂N₂H₈）₂]²⁺fragments to form a one-dimensional chain structure.3. Na₂SiO₃·9H₂O, Na₂MoO₄·2H₂O, GeO₂, ErCl₃·6H₂O, CuCl₂were used as the reactants. Theorganic ligand ethylenediamine was also added to the reaction system. A new lanthanideerbium-containing molybdosilicate was synthesized by the rational one-pot syntheticprocedure in the similar aqueous solution.H(C₂N₂H₁₀)₅[Cu（C₂N₂H₈）₂][Er(SiMo₁₁O₃₉)₂]·9H₂O（C₂N₂H₈=ethylenediamine）（6）...