Syntheses and crystal structures of two cadmium coordination polymers [Cd(2-mBIM)(NCS)(SCN)]n and [Cd2(2-mBIM)2(NO3)2(C4H4O4)(H2O)5]n based on bis(2-methylimidazol-1-yl)methane

Two cadmium(II) coordination polymers, [Cd(2-mBIM)(NCS)(SCN)](n) (1) and [Cd-2(2-mBIM)(2)(NO3)(2)(C4H4O4)(H2O)5](n) (2) (2-mBIM = bis(2-methylimidazo-1-yl)methane, C4H4O4= succinate), have been synthesized and characterized by X-ray diffraction. Complex 1 crystallizes in the triclinic space group P1 with a = 9.0770(5) angstrom, b = 9.4043(4) angstrom, c = 19.8720(9) angstrom, alpha = 101.551(1)degrees, beta = 93.498(1)degrees, lambda = 108.484(1)degrees, V = 1562.02(13) angstrom 3, and Z = 2. Each Cd(II) is octahedrally coordinated and connected with two adjacent Cd(II)'s by double end-to-end thiocyanate bridges, resulting in the formation of 1-D zigzag chains, linked to each other via bridging 2-mBIM giving a 2-D supramolecular framework. Complex 2 crystallizes in the monoclinic space group P2(1)/n with a = 12.6543(6) angstrom, b = 7.7128(4) angstrom, c = 17.3089(9) angstrom, beta = 109.3980(10)degrees, V = 1593.45(14) angstrom 3, and Z = 2. Cd(II) is coordinated with oxygen and nitrogens from two independent 2-mBIM, in a cis-configuration to form a 1-D helical structure. A 3-D supramolecular network comprised of succinate anion bridged 1-D helical chains, and weak hydrogen bonds between dimer waters gave 2-D layers.