A two-fold interpenetrated zinc-organic framework: luminescence detection of CrO42-/Cr2O72- and chemical conversion of CO2

A novel two-fold interpenetrated 3D metal-organic framework {[Zn(DCTP)]4.2H(2)O}(n) (1) (H2DCTP = 4-(3,5-dicarboxyphenyl)-4,2:6,4-terpyridine) was synthesized from a pyridine-carboxylic ligand and Zn(OAc)(2) under solvothermal conditions. Along the a-axis, a large pore exists in 1 with a size of 12.5 x 14.7 angstrom, and after removing solvent molecules, the porosity is 22.4%. Thermogravimetric analysis (TGA) and powder X-ray diffraction (PXRD) show that 1 has high thermal, pH, and solvent stability. Importantly, 1 is able to significantly capture CO2 at up to 67 cm(3) g(-1) at 273 K. Furthermore, 1 can effectively catalyze the cycloaddition reaction of CO2 with epoxides, and it can be recycled at least five times without a change in catalytic efficiency. Additionally, 1 can serve as a sensitive and recyclable luminescent probe to detect CrO42-/Cr2O72-, and the detection limit can reach 1 x 10(-6) M and 1.5 x 10(-6) M, respectively.