A triazine-functionalized nanoporous metal-organic framework for the selective adsorption and chromatographic separation of transition metal ions and cationic dyes and white-light emission by Ln(3+) ion encapsulation

摘要

In this study, a triazine-based nanoporous metal-organic framework (MOF1) using the tricarboxyl ligand 5,5 ',5 ''-((1,3,5-triazine-2,4,6-triyl)tris(azanediyl))tris(2-methylbenzoic acid) was solvothermally synthesized. High thermal and chemical stability of MOF1 was established by thermogravimetric and powder X-ray diffraction analysis. Owing to its porous structure with potential nitrogen chelating sites, MOF1 could selectively adsorb the Cu2+ ions over the Mn2+, Ni2+, Co2+, and Zn2+ ions, and the chromatographic separation of the Co2+ ion was achieved from a mixed solution containing Co2+ and Cu2+. Moreover, MOF1 could selectively adsorb and separate cationic dyes on the basis of ionic selectivity rather than size selectivity. Furthermore, the nanoporous MOF1 was used as a host to encapsulate luminescent species, and it displayed a characteristic luminescent color (green for Tb3+ and red for Eu3+); moreover, we tuned the luminescence properties of the MOF1 to achieve white light emission with good color quality.