Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China.
Dalton Trans. 2019 Feb 19;48(8):2813-2821. doi: 10.1039/c8dt04944k.
Three tartrate-bridging lanthanide-based tungstoarsenate dimers K11H13[Ln3(H2O)8(OH)2(AsW9O33)(AsW10O35(C4O6H3))]2·nH2O (Ln3+ = Eu3+ (1Eu), n = 50; Tb3+ (2Tb), n = 34; C4O6H6 = tartaric acid) and K15H9[Dy3(H2O)15(OH)2(AsW9O33)(AsW10O35(C4O6H3))]2·21H2O (3Dy) have been synthesized and further characterized by elemental analyses, X-ray powder diffraction, IR spectra, thermogravimetric analyses and single-crystal X-ray diffraction. Structural analyses indicate that all the polyanions of 1Eu-3Dy are isostructural, and are composed of two identical asymmetric sandwiched subunits [Ln3(H2O)8(OH)2(AsW9O33)(AsW10O35(C4O6H3))]12- interlinked by two tartrate ligands. Furthermore, the photoluminescence and variable-temperature magnetic properties of 1Eu, 2Tb and 3Dy have also been investigated.
三种酒石酸桥联的镧系钨砷酸盐二聚体 K11H13[Ln3(H2O)8(OH)2(AsW9O33)(AsW10O35(C4O6H3))]2·nH2O（Ln3+ = Eu3+（1Eu），n = 50；Tb3+（2Tb），n = 34；C4O6H6 = 酒石酸）和 K15H9[Dy3(H2O)15(OH)2(AsW9O33)(AsW10O35(C4O6H3))]2·21H2O（3Dy）已经被合成并通过元素分析、X 射线粉末衍射、红外光谱、热重分析和单晶 X 射线衍射进行了进一步的表征。结构分析表明，1Eu-3Dy 的所有多阴离子都是同构的，由两个相同的不对称夹心亚基[Ln3(H2O)8(OH)2(AsW9O33)(AsW10O35(C4O6H3))]12-通过两个酒石酸配体连接而成。此外，还研究了 1Eu、2Tb 和 3Dy 的光致发光和变温磁性质。
