| Abstract: | Two new organic–inorganic polyoxometalates Cu(dien)(H2O)]2{Cu2(dien)2(OH)]2Cu4(B-α-XW9O33)2]}·4H2O (X?=?Sb, 1; X?=?As, 2) (dien?=?diethylenetriamine) were hydrothermally synthesized and characterized by elemental analysis, IR spectra, thermogravimetric (TG) analyses, and single-crystal X-ray diffraction. Both compounds are constructed from one four-coordinate Cu(dien)(H2O)]2+, one {Cu2(dien)2(OH)]2Cu4(B-α-XW9O33)2]} building unit, and four water molecules of crystallization. Structural analysis shows that the sandwich-like polyoxotungstate cluster anions Cu4(B-α-XW9O33)2]10? are linked by six adjacent dimeric cations Cu2(dien)2(OH)]3+ into a 2-D architecture with a (6,3)-connected topology. Magnetic measurements of 1 and 2 exhibit the presence of antiferromagnetic interactions within the tetranuclear-CuII cluster. |
