Self-assembly of a cadmium(II) diamondoid net with 2-fold interpenetrating microporous structure

Assembly of 5-methoxyisophthalic acid (H2moip) with cadmium(II) ions in the presence of neutral ancillary 1,3-bis(4-pyridyl)propane (bpp) yields a new coordination polymer, [Cd(moip)(bpp)(H2O)]n·nH2O (1). X-ray single-crystal diffraction determination reveals that complex 1 crystallizes in the space group C2/c of monoclinic crystal system: a = 14.545(2), b = 18.749(3), c = 17.359(3) A, β = 105.480(2)o. Complex 1 is a 4-connected 3D diamondoid topological framework with a 2-fold interpenetration. Interestingly, the dense adamantine cages with inherent microporous structure are filled with free water molecules to further stabilize the coordination network.