Multifunctional-response Cd-LMOF based on triphenylamine with high selectivity for the detection of chromium ions.

A luminescent Cd-MOF is synthesized based on a triphenylamine-core ligand tris(4-(1H-imidazol-1-yl)phenyl)amine (TIPA), [Cd₂(TIPA)₂(oba)₂]_n (LMOF-1, oba = 4,4′-oxybisbenzoic). Fluorescence analysis of LMOF-1 shows blue light which can be attributed to the double role of ligand-to-ligand charge transition (LLCT) and aggregation-induced emission (AIE) effect, indicating that it can be used as a potential LED phosphor. As a luminescent sensor, LMOF-1 has excellent performance in detecting Cr³⁺, CrO₄²⁻, and Cr₂O₇²⁻ in water. Significantly, the quenching coefficient (K_SV) of Cr³⁺ is 1.64 × 10⁴ M⁻¹, which is greater than or comparable to those reported in the literature. Therefore, LMOF-1 may be an excellent multi-functional response and recyclable luminescent sensor. [ABSTRACT FROM AUTHOR]