Two novel luminescent metal-organic frameworks based on the thioether bond modification: The selective sensing and effective CO2 fixation.

Two new complexes {[Cd 3 L 2 (4,4'-bipy)(H 2 O) 2 ]·2H 2 O} n (1) and {[Zn 3 L 2 (4,4'-bipy)(H 2 O)]·H 2 O} n (2), were synthesized successfully based on 5-((carboxy-3-thio) methyl)isophthalic acid (H 3 L) and 4,4'-bipyridine (4,4'-bipy) auxiliary ligands under solvothermal conditions. Complexes 1 and 2 have the three-dimensional (3D) crystal structures, which contain infinitely extended one-dimensional (1D) metal chains decorated by open metal sites (OMSs). 1 and 2 both show good thermal stability and excellent water resistance. Fluorescence tests showed that complex 1 has high selectivity and sensitivity to detect Fe3+, Cr 2 O 7 2− and CrO 4 2− ions in aqueous solution. In addition, complex 1 is an excellent heterogeneous catalyst for the cycloaddition of CO 2 and epoxides that catalytic efficiency of epichlorohydrin is higher than 99% under mild conditions. Two new complexes {[Cd 3 L 2 (4,4'-bipy)(H 2 O) 2 ]·2H 2 O} n (1) and {[Zn 3 L 2 (4,4'-bipy) (H 2 O)]·H 2 O} n (2) were synthesized. 1 as a fluorescent probe can detect Fe3+, Cr 2 O 7 2− and CrO 4 2− ions in aqueous solution quickly and accurately with low detection limit especially. Meanwhile, complex 1 exhibits great catalytic performance for CO 2 and epoxides due to the abundant open metal sites (OMSs) embellished the 1D channel. [Display omitted] • Two new complexes were constructed based on 5-((carboxy-3-thio) methyl)isophthalic acid. • Complexes 1 and 2 feature 3D porous frameworks with high open metal sites. • Complex 1 has high selectivity and sensitivity to detect Fe3+, Cr 2 O 7 2− and CrO 4 2− ions. • The desolvated 1 exhibits great catalytic performance for CO 2 and epoxides under mild conditions. [ABSTRACT FROM AUTHOR]