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A novel open-framework vanadium(Ⅳ) phosphate (H3NCH2CH2NH3)3[(VO)4(PO4)2(HPO4)4] (short for V2P3-en) has been prepared. It is synthesized hydrothermally in the presence of ethylenediamine (en) at 170℃ for 5 days by self-assembly from structurally simple p