A Cobalt-Organic Framework with Sensitive Detection of Fe3+, Cr2O72–, and CrO42– Ions in Water

A six-coordinated 3D metal–organic framework (MOF), namely, [Co(BPDC)(3-bpdb)(H2O)2]n (1) (H2BPDC = 4,4?-biphenyldicarboxylic acid, 3-bpdb 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene) was purposefully constructed and characterized by single-crystal XRD, IR, elemental analyses, PXRD, SEM, TGA. Crystal structural analysis revealed that the complex consists of a cds-type three-fold interpenetrated framework. Hirshfeld surface yielded details characteristics 1. Significant O?H···O hydrogen bonding interactions, which could promote stability framework, were found is extremely stable in aqueous solution can resist acids bases over an extensive pH range 2–13. 1 shows brilliant fluorescent emission solid state solution. Fluorescence titration, cyclic, anti-interference experiments demonstrated excellent probe for Fe3+, CrO42? Cr2O72? water. The Ksv values CrO42?, Cr2O72?, as high 1.06 × 104 M?1, 1.50 1.16 respectively, comparable with those other sensors. quenching mechanism novel subsequently explained.