Two New Three-Dimensional Porous Polyoxometalates with Typical ACO Topological Open Frameworks:  {[Cu₄V₁₃IVV₅VO₄₂(NO₃)(C₃H₁₀N₂)₈]·10H₂O}n and {[Cu₄V₁₂IVV₆VO₄₂(SO₄)(C₃H₁₀N₂)₈]·10H₂O}n

Two new three-dimensional open frameworks, {[Cu 4 V 13 IV V 5 V O 42 (NO 3 )(C 3 H 10 N 2 ) 8 ]·10H 2 O} n ( 1 ) and {[Cu 4 V 12 IV V 6 V O 42 (SO 4 )(C 3 H 10 N 2 ) 8 ]·10H 2 O} n ( 2 ), have been hydrothermally synthesized. Structural analysis indicates that both complexes are isomorphic and are constructed from a cluster anion [V 18 O 42 (XO y )] 8- (X = N, y = 3 or X = S, y = 4) and a bridging cation [Cu(C 3 H 10 N 2 ) 2 ] 2+ with classical ACO topological structure. Complex 1 crystallizes in the tetragonal space group P 4/ nnc, with a = b = 15.1128(12) Å, c = 18.670(3) Å, V = 4264.1(9) Å 3, Z = 2. Complex 2 is tetragonal, P 4/ nnc, a = b = 15.1131(10) Å, c = 18.588(10) Å, V = 4245.5(7) Å 3, Z = 2. Both complexes keep the same topological framework with channels of dimensions 7.5 × 7.5 Å running along the [001] direction.