Tuning structural dimensionalities of two new luminescent Cd(II) compounds: Different dicarboxylate coligands

• Organic carboxylate tuned two different Cd(II) compounds.
• Compound 1 features a1D chain structure, and compound 2 features a 3-fold interpenetrated dia-type framework.
• These two compounds exhibit intense ligand-centered luminescence.

Two new Cd(II) compounds, namely [Cd (tdc)(HPPA)]n·n (H2O) (1) and [Cd3 (obb)2(PPA)2(H2O)3]n (2) (H2tdc = 2,5-thiophenedicarboxylic acid, HPPA = pipemidic acid, H2oba = 4,4′-oxybis (benzoate)), have been synthesized by incorporating pipemidic acid with Cd(II) ions and dicarboxylate coligands. Structural analyses reveal that compound 1 is a 1D chain structure, and further extended into a 2D supramolecular layered framework via intermolecular π…π and hydrogen bonding interactions, and compound 2 features a 3-fold interpenetrated 3D framework with 4-connected dia topology. HPPA ligand displays two different coordination modes in these two compounds. In addition, the thermal stabilities and luminescent properties of compounds 1 and 2 were also investigated in the solid state at room temperature.

Presented here are two new Cd(II) compounds, namely [Cd (tdc)(HPPA)]n·n (H2O) (1) and [Cd3 (obb)2(PPA)2(H2O)3]n (2) (H2tdc = 2,5-thiophenedicarboxylic acid, HPPA = pipemidic acid, H2obb = 4,4′-oxybis (benzoate)). Compound 1 features a 1D chain structure, and further extended into a 2D supramolecular layered framework via intermolecular π…π and hydrogen bonding interactions, compound 2 features a 3-fold interpenetrated 3D framework with 4-connected dia topology.Figure optionsDownload as PowerPoint slide