Co(NH_3)_6_2Cd_8(C_2O_4)_(11)(H_2O)_4·8H_2O: A 5-connected sqp topological metal-organic framework co-templated by Co(NH_3)_6^(3+) cation and (H_2O)_4 cluster

摘要

In our efforts to construct new metal–organic frameworks(MOFs) by template-directing method, a new cadmium oxalate, [Co(NH3)6]2[Cd8(C2O4)11(H2O)4] 8H2O(denoted HNU-1), has been synthesized under hydrothermal condition in the presence of Co(NH3)6Cl3. The crystal structure of HNU-1 was determined by single-crystal X-ray diffraction(monoclinic, C2/c), a = 11.126(2), b = 17.361(4), c = 16.119(3),b = 102.40(3)8, V = 3040.8(10) 3and Z = 8. The open framework of HNU-1 contains 12-ring channels and exhibits a 5-connected sqp topological network with dinuclear Cd(II) clusters acting as nodes. The Co(NH3)63+cations and unusual hydrogen-bonded(H2O)4clusters are found in the 12-ring channels with an alternative arrangement. It is believed that the(H2O)4clusters play a co-templating role in the crystallization of HNU-1.