Tetra-imidazole functionalized pyrene for constructing Co-MOF and its application for sensing of cyanide ion

An imidazole-decorated pyrene (1,3,6,8-tetraimidazolyl-pyrene, TIP) with aggregation-induced emission effect in THF-H2O system has been synthesized, which is further utilized for architecting a novel Co-MOF (TIP-Co) through hydrothermal method. Structural analysis demonstrates TIP-Co shows a 4-c uninodal 2D net, with a simplified point symbol of {4(4).6(2)}. TIP-Co shows excellent pH durability in a wide pH range of 2.0-12.0, and its thermal stability is also demonstrated below 348 degrees C by thermogravimetric analysis. Significantly, TIP-Co can be developed as fluorescent sensor for CN- by fluorescence quenching with good performances in selectivity and sensitivity. A detection limit of TIP-Co towards CN- is evaluated to 89.3 nM, allowing the further use for monitoring cyanide ion in real water samples.

Automated summary

A novel imidazole-decorated pyrene and a Co-MOF were successfully synthesized and characterized. TIP-Co exhibited excellent pH durability and thermal stability, and could serve as a fluorescent sensor for detecting cyanide ions in water samples with high selectivity and sensitivity, showing a detection limit of 89.3 nM.