New TPPE-ligand-based luminescent zn(II) organic frameworks as a sensor for detecting Fe3+, CrO42- and Cr2O72- in aqueous media.

A new luminescent Zn-MOF is synthesized based on a TPE-core ligand TPPE, [Zn(TPPE)₂(sdc)₂]_n (LMOF-1, TPPE = 1,1,2,2-tetrakis(4-(pyridin-4-yl)phenyl)ethene, sdc = 4,4'-(ethene-1,2-diyl)dibenzoic acid). Fluorescence analysis of LMOF-1 shows blue light which can be attributed to the role of ligand-to-metal charge transition (LMCT), indicating that it can be used as a potential LED phosphor. As a luminescent sensor, LMOF-1 has excellent performance in detecting Fe³⁺, CrO₄²⁻ and Cr₂O₇²⁻ in water. Significantly, the quenching coefficients (K_SV) of Fe³⁺, CrO₄²⁻ and Cr₂O₇²⁻ are 6.0 × 10³ M⁻¹, 1.58 × 10³ M⁻¹ and 2.44 × 10³ M⁻¹, respectively. Therefore, LMOF-1 may be an outstanding multi − functional response and recyclable luminescent sensor. [ABSTRACT FROM AUTHOR]