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A polyoxovanadium borate [Na(H2O)]2[Na(H2O)2]2[Cu(en)2][V12B18O54(OH)6]·(H3O)2·(H2O)18 1(en = ethylenediamine) has been hydrothermally synthesized and characterized by IR,two-dimensional infrared(2D IR) correlation spectroscopy with magnetic and