Organizing chain and square-grid architectures by employing coordination bonds between inorganic and organic components. New coordination polymers formed from Cd(II), Co(II), and Cu(II) nitrate salts and 1,4-bis(4-pyridyl)butadiyne

Four new coordination polymers containing the long conjugated bidentate ligand 1,4-bis(4-pyridyl)butadiyne (2) and cadmium, cobalt, and copper nitrate hydrates are reported. The coordination polymers were synthesized using almost identical solution reaction conditions utilizing the same mixed methanol/methylene chloride solvent system. The first compound [Cd(1,4-bis(4-pyridyl)butadiyne)(NO3)(2)(H2O). CH2Cl2](n) (3; monoclinic, C2/c; a = 28.135(3) Angstrom, b = 8.535(1) Angstrom, c = 17.642(2) Angstrom, beta = 91.797(2)degrees, Z = 8) is obtained by combination of 2 with Cd(NO3)(2). 6H(2)O. The structure includes a rare sinusoidal-type polymer chain architecture, effected by a combination of hydrogen-bonding interactions and pi-pi interactions between adjacent alkyne regions of the ligand. The second species [Co(1,4-bis(4-pyridyl)butadiyne)-(NO3)(2)(H2O)(2). 2H(2)O](n) (4; orthorhombic, Pccn; a = 22.999(3) Angstrom, b = 23.338(3) Angstrom c = 7.388(1) A, Z = 8) is generated from the reaction of 2 and Co(NO3)(2). 6H(2)O and forms a straight-chain polymeric architecture consisting of double chains that crisscross each other, generating a new layer architecture. The third species (Cu(1,4-bis(4-pyridyl)butadiyne)(2)(NO3)(2). CH2Cl2](n) (5; orthorhombic, C222(1); a = 14.382(1) Angstrom, b = 22.755(2) Angstrom, c = 8.975(1) Angstrom, Z = 4) is prepared from the reaction of 2 and Cu(NO3)(2). 3H(2)O. The structure of 5 exhibits a two-dimensional interpenetrating square-grid-type architecture from the coordination of four pyridyl rings at the copper center. The intersection of the grids generates large continuous rhombic channels that can be occupied by organic molecules. The fourth species [Co(1,4-bis(4-pyridyl)-butadiyne)(2)(NO3)(2). CH2Cl2](n) (6; orthorhombic, C222(1); a = 14.0364(12) Angstrom, b = 23.7595(19) Angstrom, c = 8.9706(7) Angstrom, Z = 4) is generated from the reaction of 2 and Co(NO3)(2). 6H(2)O and is isostructural with 5.