Abstract
A new type of heteropolytungstate is reported that contains in a triangular arrangement one lanthanide f element and two d transition metals in form of heteroatoms. The first example in this series is the monoclinic Na3K5[((VO)2Dy(H2O)4K2(H2O)2Na(H2O)2)(α-B-AsW9O33)2] · 23H2O (1) which was prepared from an acidified aqueous solution of Na2WO4 · 2H2O, As2O3 and VOSO4 · 5H2O to which Dy3+ ions were added. The single crystal X-ray structure analysis shows that the anion 1a consists of two [α-B-AsIIIW9O33]9− trilacunary Keggin type units linked by two VO2+, one Dy3+ as well as two K+ and one Na+ ion, resulting in a sandwich-type structure with idealized C 2v symmetry. The complete magnetochemical analysis shows very interesting magnetic properties, which will be considered in the full series together with the properties of the homologous compounds in due course.
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