Utilizing the adaptive precursor [As2W19O67(H2O)](14-) to support three hexanuclear lanthanoid-based tungstoarsenate dimers

摘要

Three tartrate- bridging lanthanide- based tungstoarsenate dimers K11H13[ Ln3( H2O) 8( OH) 2( AsW9O33) ( AsW10O35( C4O6H3))] 2 center dot nH2O ( Ln3+ = Eu3+ ( 1Eu), n = 50; Tb3+ ( 2Tb), n = 34; C4O6H6 = tartaric acid) and K15H9[ Dy3( H2O) 15( OH) 2( AsW9O33)( AsW10O35( C4O6H3))] 2 center dot 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.