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. 2025 Nov 7;348(Pt 1):127157.
doi: 10.1016/j.saa.2025.127157. Online ahead of print.

Two novel multifunctional Cd(II)-MOFs based on benzimidazole-terpyridine ligand for high selective fluorescence sensing and CO2 adsorption properties

Zi-Lang Wang  1 , Rou Yang  1 , Si-Si Liu  1 , Xin-Yao Liu  1 , Wen-Xia Hu  1 , Xin-Yu Wen  1 , Xiang Wei  1 , Yang Liu  1 , Man-Sheng Chen  1 , Long-Sheng Wang  2 , Wei-Wei Fu  3
Affiliations

Two novel multifunctional Cd(II)-MOFs based on benzimidazole-terpyridine ligand for high selective fluorescence sensing and CO2 adsorption properties

Zi-Lang Wang et al. Spectrochim Acta A Mol Biomol Spectrosc. .

Abstract

Two novel Cd(II) Metal-Organic Frameworks (MOFs), namely, {[Cd(bimphtpy)(m-bdc)(H2O)]·(H2O)3}n (Cd-MOF-1) and {[Cd(bimphtpy)(tdc)(H2O)]·(H2O)3}n (Cd-MOF-1), have been assembled from two unique dicarboxylate ligands (m-H2bdc = meta-benzenedicarboxylic acid, H2tdc = 2,5-thiophenedicarboxylic acid) and 4'-(4-(1H-benzimidazol-1-yl)phenyl)-3,2':6',3″-terpyridine (bimphtpy), featuring two dimensional (2D) frameworks. Cd-MOF-1 and Cd-MOF-2 are isostructural, exhibiting undulated 2D layers with 4-connected sql topology. Within this structure, 1D channels (void fraction: 21.6 % for Cd-MOF-1 and 20.6 % for Cd-MOF-2) arise from parallelogram windows formed by vertex-sharing [Cd4] nodes. Both Cd-MOF-1 and Cd-MOF-2 are promising quintuple-functional fluorescent sensors of Fe3+, Cr2O72-, Sulfathiazole (STZ), Oxytetracycline (OTC) and Nitrofurantoin (NFT) with high selectivity and sensitivity through luminescence quenching effects. The limits of detection (LOD) of Cd-MOF-1 and Cd-MOF-2 are 4.11 × 10-6 mol·L-1 and 7.84 × 10-6 mol·L-1 for Fe3+, 2.12 × 10-6 mol·L-1 and 1.32 × 10-6 mol·L-1 for Cr2O72-, 9.17 × 10-7 mol·L-1 and 1.79 × 10-7 mol·L-1 for STZ, 3.73 × 10-7 mol·L-1 and 5.51 × 10-7 mol·L-1 for OTC and 1.92 × 10-7 mol·L-1 and 5.58 × 10-7 mol·L-1 for NFT, respectively. Investigations into the plausible pathways for fluorescence quenching phenomena have integrated PXRD, UV-vis, fluorescence lifetime studies, and theoretical calculations. Moreover, CO2 adsorption capacities quantified as 15.1 cm3 g-1 for Cd-MOF-1 and 7.99 cm3 g-1 for Cd-MOF-2 at 273 K and 1 bar have been determined. The dual-functional frameworks serve as gas separation materials and multi-analyte sensing platforms, enabling synchronous detection of Fe3+, Cr2O72-, STZ, OTC and NFT via analyte-specific quenching pathways.

Keywords: Antibiotics detection; Fluorescence sensing; Gas adsorption; Metal-organic frameworks; Terpyridine.

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Conflict of interest statement

Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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