Synthesis and Structural Characterization of a New Two-dimensional Organic-Inorganic Hybrid Molybdoarsenate: [Cu(en) 2 ] 2 [(CuO 6 )Mo 6 O 18 (As 3 O 3 ) 2 ]

A new organic-inorganic hybrid molybdoarsenate constructed from a unit with two (As 3 O 3 ) rings capping Anderson-type moieties, [Cu(en) 2 ] 2 [(CuO 6 )Mo 6 O 18 (As 3 O 3 ) 2 ] (1) (en = ethylenediamine), has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction and thermogravimetric analysis. The compound crystallizes monoclinically, space group P2 1/c , with unit cell dimensions a = 9.1541(7), b = 19.6348(14), c = 14.5205(8) Å ,β = 129.082(3)◦,V = 364.20(4) Å 3 , Z = 2, T = 296(2) K. Complex 1 represents the first example of a 2D network of a POM polymer where [(CuO 6 )Mo 6 O 18 (As 3 O 3 ) 2 ] 4− building blocks are connected by complex fragments {Cu(en) 2 } 2+ .