Design, Synthesis and Characterization of Coordination Polymer from [Cu(DMF)4(SCN)2] as a Precursor

This paper is focused on investigation of coordination polymers constructed by Cu(II) and rigid pyridyl ligands, such as 4,4'-bipyridyl-1,2,4-triazole (Hpytz) and 1,10-phenanthroline (phen) from a mononuclear precursor [Cu(DMF)(4)(NCS)(2)] (1). As expected, the complex was self-assembled with phen to form a 1D double-stranded chain of [Cu(phen)(mu-SCN)(2)](infinity) (2), with Hpytz to form 1D zigzag chain of [Cu-2(mu-Hpytz)(2)(NCS)(2)(DMF)(2)(mu-SCN)(2)](infinity) (3) in which thiocyanate anion linked the Cu-mu-Hpytz-Cu chain into an infinite 2D network via weak Cu. S interaction. To treat 3 with the bridged anion dca, a novel 3D framework [Cu(mu-Hpytz)(mu-dca)(mu-SCN)](infinity) (4) was obtained in which Cu-mu-Hpytz-Cu chain is preserved and both thiocyanate anion and dicyanamide (dca) act as bridging ligands. In addition, complex 3 was applied as a metal catalyst in polymerization of MMA in aqueous solution at room temperature.