文摘
Three lanthanide (Ln) substituted polyoxometalates [{(¦Á-PW11O39H2)Ln(H2O)(¦Ç2,¦Ì-1,1)-CH3COO}2]10? (Ln = Dy(III) for 1, Y(III) for 2, Lu(III) for 3) have been synthesized successfully in moderate aqueous solution and characterized by elemental analyses, IR spectra, UV spectroscopy, thermogravimetric analyses, fluorescence spectra, X-ray powder diffraction (XRPD) and single-crystal X-ray diffraction. The structure analyses reveal that 1-3 are isostructural and constructed by two mono-lanthanide substituted units [(¦Á-PW11O39H2)Ln(H2O)(¦Ç2,¦Ì-1,1)-CH3COO]5?, which are bridged by two (¦Ç2,¦Ì-1,1)-acetato ligands. The solid-state photoluminescence properties of 1-3 were studied and the results indicate that only 1 demonstrates yellow luminescence. Magnetic measurements reveal that 1 shows spin-orbital coupling interactions and weak antiferromagnetic exchange interactions.
