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A new organic-inorganic hybrid phosphotungstate-based Cu~Ⅱ-Er~Ⅲ heterometallic derivative[Cu(dap)_2(H_2O)][Cu(dap)_2]_(4.5)[Er(α-PW_(11)O_(39))_2]·4H_2O(1,dap = 1,2-diaminopropane) has been hydrothermally prepared and characterized by elemental analy