A series of inorganic–organic hybrid compounds constructed from bis(undecatungstophosphate) lanthanates and copper-organic units

A series of inorganic–organic hybrid compounds built from bis(undecatungstophosphate) lanthanates and copper-complexes, namely, H8[Cu(en)2H2O]4[Cu(en)2]{[Cu(en)2][La(PW11O39)2]}2·18H2O (1), H6[Na2(en)2(H2O)5][Cu(en)2H2O]4[Cu(en)2]{[Cu(en)2][Ce(PW11O39)2]}2·16H2O (2), H6[Na2(en)2(H2O)5][Cu(en)2H2O]4[Cu(en)2]{[Cu(en)2][Pr(PW11O39)2]}2·18H2O (3), H6[Na2(en)2(H2O)4][Cu(en)2H2O]4[Cu(en)2]{[Cu(en)2][Nd(PW11O39)2]}2·14H2O (4), H6[Na2(en)2(H2O)5][Cu(en)2H2O]4[Cu(en)2]{[Cu(en)2][Sm(PW11O39)2]}2·20H2O (5), and H7[Cu(en)2]2[Sm(PW11O39)2]·10H2O (6) (where en = 1,2-ethylenediamine), have been prepared. In these compounds, two lacunary [PW11O39]7− anions sandwich an eight-coordinated Ln(III) cation to yield [Ln(PW11O39)2]11− anion in a twisted square anti-prismatic geometry, which is further bridged by [Cu(en)2]2+ fragments to generate a 1D zigzag-like chain. In 1–6, the coordination bond interactions and weak interactions between adjacent 1D chains play an important role in the zigzagging distances and angles of different 1D chains. The magnetic studies indicate that antiferromagnetic interactions exist in compounds 1, 2 and 4.