Three naphthalenedisulfonate polymers with imidazole-containing ligands: Synthesis, structure and heterogeneously catalytic performance in reactions of enamination of β-dicarbonyl compounds

• Three new coordination polymers of Cd(II) and Cu(I) containing arenedisulfonates as ligands were synthesized.
• All naphthalenedisulfonate ligands act in bridging coordination mode in all compounds.
• Naphthalenedisulfonate copper complex are tested as heterogeneous catalysts for chemo- and regio-selective enamination of β-ketoesters.

Three new naphthalenedisulfonate polymers, [Cd(2,6-nds)(bib)]n (1), [Cd(1,5-nds)(bib)]n (2), and [Cu(2,6-nds)0.5(tpim)]n (3), have been successfully synthesized by hydrothermal reactions of corresponding metal salts with naphthalenedisulfonate (nds) and imidazole-containing ligands 1,4-bis(imidazol-1-ylmethyl)benzene (bib) and 2,4,5-tri(4-pyridyl)-imidazole (tpim). The structures of these polymers were determined by single crystal X-ray diffraction analysis. Polymers 1 and 2 crystallize in the same space group and have similar cell parameters, and thus show same three-dimensional (3D) framework architecture. Complex 3 has the same 2D layer structure. The photoluminescent properties of the complexes 1 and 2 were investigated. Catalytic tests indicate that complex 3 has chemo- and regio-selective catalytic activity towards enamination of β-ketoesters.

Three new crystal structures of arenedisulfonate polymers formed by imidazole-containing ligands were determined by X-ray diffraction method and their photoluminescent properties and catalytic activity towards enamination of β-ketoesters were investigated.Figure optionsDownload as PowerPoint slide