Abstract A novel Mo(V) diphosphate Sr(MoO) 2 P 2 O 7 has been synthesized. It crystallizes in the space group P 2 1 / n with a =7.925(1) A, b =7.739(1) A, c =9.485(1) A and β =91.05(1)°. Its original framework consists of MoP 2 O 11 units built up of one P 2 O 7 group sharing two apices with one MoO 6 octahedron. The MoP 2 O 11 units share corners, forming [MoP 2 O 10 ] ∞ chains running along [101]. The assemblage of these chains forms the [Mo 2 P 4 O 16 ] ∞ intersecting tunnel framework. The Sr 2+ cations are located at the tunnel intersection, showing a distorted cubic coordination. This structure is compared to those of Ba(MoO) 2 P 2 O 7 and LiMoOP 2 O 7 , which are also built up of MoP 2 O 11 units forming [MoP 2 O 10 ] ∞ chains, but with different configurations.