LAUSR

Absract A novel hydrolytic stable Zn(II)-organic framework {[Zn(afsba)(bbtz)1.5(H2O)2]·2H2O}n (1) based on the amino/sulfonato-functionalized ligand 2-amino-5-sulfobenzoic acid (H2afsba) and the auxiliary flexible ligand 1, 4-bis(triazol-1-ylmethyl)benzene (bbtz) was constructed hydrothermally. Single-crystal X-ray diffraction analysis reveals that 1 shows a novel 1D→2D polyrotaxane framework architecture. The detailed analysis of the solid state diffuse reflectance UV–vis spectrum of 1 reveals that it may be used as a potential wide band gap semiconductor material. 1 exhibits reversible dehydration-rehydration behavior. 1 manifests distinct solvent-dependent fluorescence properties. The strongest fluorescence is observed in water. 1 keeps excellent framework stability in a variety of solvents. Interstingly, 1 shows highly selective and efficient sensing of the Fe3+ cations over a variety of the interfering metal cations in both environment and biological systems. 1 could also be used as a potential highly selective and sensitive sensory material for the Cr(VI) (CrO42−/Cr2O72−) anions among a large pool of the coexistent different anions. The limits of 1 for the aqueous-phase sensing of these analytes reach to sub-ppm level (0.22 ppm/0.26 ppm for CrO42−/Cr2O72- and 0.07 ppm for Fe3+, respectively).