An yttrium-organic framework based on a hexagonal prism second building unit for luminescent sensing of antibiotics and highly effective CO2 fixation

Abstract

A 3D hybrid microporous highly connected yttrium-organic framework (Y-TCPP) based on 2,3,5,6-tetrakis(4-carboxyphenyl)pyrazine (H₄TCPP) was favourably built via solvothermal reaction. H₄TCPP can be regarded as a 4-connected rectangular geometry node, and the 12-connected Y₉ cluster can be simplified as a hexagonal prism second building unit (SBU). The Y₉ SBUs further interconnect with the TCPP⁴⁻ ligand, resulting in a 3D framework with shp topology. Y-TCPP not only exhibits outstanding chemical stability in the organic phase but also possesses permanent porosity with a BET surface area of 1125 m² g⁻¹. Y-TCPP exhibits excellent fluorescence properties and can be used to detect a small amount of furacillin in aqueous solutions. Moreover, the fluorescence quenching effect was not affected by other kinds of antibiotics. In addition, Y-TCPP shows a medium adsorption capacity for CO₂ as well as excellent catalytic properties for CO₂ conversion into cyclic carbonates. The heterogeneous catalyst shows very good catalytic stability without an obvious activity decrease after five cycles, and Y-TCPP can maintain good crystallinity. The fluorescent MOF has potential application prospects in the fields of toxic chemical detection and CO₂ cycloaddition.