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

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 (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.

GRAPHICAL ABSTRACT

KEYWORDS:

• Hydrothermal reaction
• metal-organic framework
• fluorescence property
• crystal structure
• sensor

Disclosure statement

No potential conflict of interest was reported by the authors.

Author contributions

Wei-Min Chen: Conceptualization, Methodology, Software, Investigation, Writing - Original Draft.

Juan-Juan Shao: Validation, Formal analysis, Visualization, Software.

Yi Zhang: Validation, Formal analysis, Software.

Zhen-Dong Xue: Validation, Formal analysis, Software.

Peng-Lai Liu: Validation, Formal analysis, Software.

Jian-Ling Ni: Validation, Formal analysis, Software.

Fang-Ming Wang: Resources, Writing - Review & Editing, Supervision, Data Curation.

Additional information

Funding

The JUST team would like to thank the support from the National Natural Science Foundation of China (Grant No. 21671084), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX23_3836).