Cadmium‐Based Coordination Polymers from 1D to 3D: Synthesis, Structures, and Photoluminescent and Electrochemiluminescent Properties

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Abstract
Cadmium‐based coordination polymers, namely, {[Cd(HL)(L)] ⋅ HN(Et)3}n (1), [Cd2(L)2(H2O)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)] ⋅ H2O}n (8) (H2L=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.
Funding Information
  • Nature Science Foundation of China (51569008, 21861014)
  • Program of the Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi (GXYSXTZX2017-II-3)

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