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Published on: December 11, 2013
Cadmium-Based Coordination Polymers from 1D to 3D: Synthesis, Structures, and Photoluminescent and
Zhonghang Chen1, Shuhua Zhang1, Shaomei Zhang1
1College of Chemistry and Bioengineering (Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials), Guilin University of Technology, No. 12, Jian gan RD, Guilin, Guangxi, 541004, P. R. China.
Abstract:
Cadmium-based coordination polymers, namely, {[Cd(HL)(L)] ⋅ HN(Et)3 }n (1), [Cd2 (L)2 (H2 O)5 ]n (2), [Cd(L)(phen)]n (3), [Cd(L)(2,2'-bpy)]n (4), [Cd(L)(4,4'-bpy)]n (5), [Cd(L)(bpp)]n (6), [Cd(L)(dpa)]n (7), {[Cd(L)(dpa)] ⋅ H2 O}n (8) (H2 L=4,4'-((p-tolylazanediyl)bis(methylene))dibenzoic acid, phen=1,10-phenanthroline, 2,2'-bpy=2,2'-bipyridine, 4,4'-bpy=4,4'-bipyridine, bpp=1,3-bis(4-pyridyl)propane, dpa=bis(4-pyridyl)amine) have been synthesized in hydro/solvothermal reactions. 1 is a 4-connect 3D network with an eightfold interpenetrating diamond topology. The 1D ladder chain structure of 2 was composed of the dinuclear [Cd2 (CO2 )4 ] subunit bridged with two L2- ligands. 3 shows a 1D double-chain with a channel formed by edging out the coordination water with the rigid co-ligand phen. Polymer 4 displays a 2D lamellar structure based on superseding the coordination water molecules by the rigid chelating auxiliary ligands 2,2'-bpy. By substituting the small molecules with a rigid bridging ligand 4,4'-bpy, a 2D undulating structure of 5 was built. Compounds 6 and 7 exhibit a 2D layer structure with a 4-connect (44 ⋅ 62 ) sql-net. Compound 8 presents a 3D architecture with a sixfold interpenetrating diamond topology. Through our construction strategy, versatile structures from 1D-3D have been rationally designed by controlling the process condition and rigid/flexible of N-donor spacers. Additionally, the photoluminescence, charge transfer, and electrochemical luminescence (ECL) properties of 1-8 have been demonstrated.
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