Multifunctional-response Cd-LMOF based on triphenylamine with high selectivity for the detection of chromium ions
Wei‐Min Chen, Juan‐Juan Shao, Ying Zhang, Zhen‐Dong Xue, Peng-Lai Liu, Jian-Ling Ni, Fang‐Ming Wang
Abstract
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 (KSV) 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.