1D and 2D Thiazole-Based Copper(II) Coordination Polymers: Synthesis and Applications in Carbon Dioxide Capture.

The reaction of different copper(II) salts with a class of thiazole-based ligands under solvothermal conditions produces three crystalline 1D/2D coordination polymers: [Cu(κ- N-thiazole)4(SiF6)]∞ ( 1 (1D)), {Cu[μ-(κ- N:κ -COO)- L1]2⋅(H2O)}∞ ( 2 (2D); H L1=2-aminothiazole-5-carboxylic acid), and {Cu[μ-(κ- N:κ -COO)- L2]2⋅1.5 (H2O)}∞ ( 3 (2D); H L2=thiazole-5-carboxylic acid). All the materials have been characterized through common solid-state techniques: single-crystal (XRD) and (variable-temperature) powder X-ray diffraction (PXRD), infrared spectroscopy (IR), thermogravimetric analysis combined with mass spectrometry (TGA-MS), and BET surface area and pore-size distribution measurements. Polymer 3 shows a porous structure made of squared channels formed by the ordered stacking of the planar sheets along the a crystallographic axis (inner surface area equal to 15 m2 g−1, as inferred from N2 adsorption at T=77 K on the pre-activated form), and it has been exploited for CO2 physisorption at ambient temperature ( T=303 K) and pressure ( p [ABSTRACT FROM AUTHOR]