Synthesis and crystal structure of a two-dimensional coordination polymer [Cd(dym)(H2O)2(H2O)]n with Cd6 hexagonal macrometallocycle

A 2D lamellar metal-organic coordination polymer [2-(1,3)-dithian-2-ylidene malonate] diaquoicadmium(II) hydrate, [Cd(dym)(H2O)(2)(H2O)](n) (dym = 2-(1,3)-dithian-2-ylidene malonate), has been prepared by conventional solution reaction. The structure analysis suggests that the polymer crystallized in orthorhombic system with space group Pbca and the final R indices (I > 2 sigma(I)): R-1 = 0.0236 and wR(2) = 0.0738. Crystal data: a = 12.6138(5), b = 8.4528(3), c = 22.5867(8) angstrom, V = 2409.8(15) angstrom(3), Z = 3, F(000) = 1520, D-c = 1.482 g/cm(3), mu(MoKa) = 0.990 mm(-1) and M-r = 384.69 g/mol. The Cd(II) ion is in a disordered triangle prism environment. The Cd-O distances are in the range of 2.2643(14)-2.364](15) angstrom. In the crystal, the Cd atoms are arranged at the corners of honeycomb-like hexagonal 24-membered macrometallacycle. There is a weak C-H center dot center dot center dot S interaction between the 1,3-dithiocyclohexyl groups of two adjacent dym ligands.