Synthesis and magnetic properties of tartrate-bridging rare-earth-containing polytungstoarsenate aggregates from an adaptive precursor [As2W19O67(H2O)]14−

Abstract

Six tartrate-bridging rare-earth-substituted polytungstoarsenates [RE₂(C₄H₄O₆)(C₄H₂O₆)(As W₉O₃₃)]₂¹⁸⁻ (Ho^III (1), Er^III (2), Tm^III (3), Yb^III (4), Lu^III (5), and Y^III (6)) have been synthesized under conventional solution conditions. They have been further characterized by elemental analyses, X-ray powder diffraction (XRPD), IR and UV-vis spectroscopy and single-crystal X-ray diffraction. Preliminary variable-temperature magnetic susceptibility measurements indicate that 1–4 exhibit antiferromagnetic coupling.