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A new organic-inorganic hybrid sandwich-type polyoxotungstate [Cu(dien)-(H_2O)_2]_2[{Cu(dien)(H_2O)}_3{Cu_(4.5)W_(0.5)(B-α-Sb W_9O_(33))_2}](OH)4·7H_2O(1, dien = diethylenetriamine) has been hydrothermally synthesized and structurally characterized b