A　novel　inorganic-organic　hybrid　material,　[Cu(En)2]　2H2[{Cu(En)2}2(H2W　12O42)]　•　6.5H2O　(I)　based　on　polyoxotungstates　and　Cu2+　ions,　has　been　successfully　synthesized　under　hydrothermal　conditions　and　structurally　characterized　by　single-crystal　X-ray　diffraction,　IR　spectra,　and　TG　analysis.　Structural　analysis　indicates　that　the　structure　consists　of　a　one-dimensional　structure　constructed　from　the　polyoxoanion　[H2W12O42]10-　bridged　by　{Cu(En)2}2+　groups.　Each　[H2W　12O42]10-　cluster　in　the　polymeric　chain　is　linked　to　two　neighbors　through　four　coordination　groups　of　μ2-　[Cu(En)2]2+.　Furthermore,　it　extends　into　a　three-dimensional　supramolecular　network　by　hydrogen　bonding　interactions.　©　2011　Pleiades　Publishing,　Ltd.