Polytorsional-amide/carboxylates-directed Cd(<scp>ii</scp>) coordination polymers exhibiting multi-functional sensing behaviors

Chi, Jie; Mu, Yajun; Li, Yan; Shao, Pengpeng; Liu, Guocheng; Cai, Bin; Xu, Na; Chen, Yongqiang

doi:10.1039/d1ra04411g

Cited by 2 publications

(1 citation statement)

References 79 publications

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“…Thus, the luminescence quenching could not be attributed to the destruction of the MOF structure. MOF-based luminescence sensing approaches for pesticides can be mainly based on the following mechanisms: (1) photoinduced electron transfer (PET), − (2) fluorescent resonance energy transfer (FRET), − (3) competitive absorption of excitation energy, , and (4) a weak interaction between the ligand and analyte. , To gain insights into the sensing mechanism of paraquat, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of paraquat and other pesticides were calculated and compared with those of H 2 btec 2– . As illustrated in Figure a, among the studied pesticides, only the LUMOs of paraquat and diquat are lower than that of H 2 btec 2– .…”

Section: Resultsmentioning

confidence: 99%

A Water-Stable Lanthanide-Based MOF as a Highly Sensitive Sensor for the Selective Detection of Paraquat in Agricultural Products

Wiwasuku

Chuaephon

Habarakada

et al. 2022

ACS Sustainable Chem. Eng.

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The toxic agrochemical contamination of food and the environment is one of the most pressing concerns for human health and environmental sustainability. In this work, a water-stable 3D lanthanidebased MOF, [Tb 2 (H 2 btec)(btec)(H 2 O)]•4H 2 O (Tb-MOF) has been demonstrated as a turn-off luminescent sensor for the detection of poisonous paraquat. The ligand 1,2,4,5-benzenetetracarboxylic acid (H 4 btec) was incorporated into Tb-MOF to act as a detection recognition site for a selective interaction with paraquat, resulting in a dramatic luminescence quenching. The obtained Tb-MOF not only is water stable but also tolerates acidic and basic conditions. On top of that, the rapid detection of paraquat in aqueous solution with high sensitivity and selectivity can be obtained even in the presence of common contaminants in the environment. The linear range for paraquat detection was observed in the concentration range from 0 to 50 μM with a low limit of detection of 2.84 μM and a high quenching constant of 3.95 × 10 4 M −1 . Tb-MOF can be applied to detect paraquat in water and agricultural samples with satisfactory recoveries from 85.59 to 105.20%. To gain insights into the molecular recognition, time-dependent density functional theory (TD-DFT) calculations were conducted to reveal the specific interactions between paraquat and the ligand in the backbone structure of the MOF. The quenching mechanism is attributed to a photoinduced electron transfer (PET) from the MOF to paraquat and the competitive absorption of excitation energy by paraquat. To demonstrate a practical implementation of the MOFbased sensor, a PVA/Tb-MOF@paper strip was fabricated, which can visually detect paraquat under irradiation with a UV lamp. These results indicate that Tb-MOF can be used as a potential sensor for the practical detection of paraquat in the environment and agricultural products.

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Section: Resultsmentioning

confidence: 99%

A Water-Stable Lanthanide-Based MOF as a Highly Sensitive Sensor for the Selective Detection of Paraquat in Agricultural Products

Wiwasuku

Chuaephon

Habarakada

et al. 2022

ACS Sustainable Chem. Eng.

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Metal and bis(pyridyl)-bis(amide) ligands – tuned three new nickel(II)/copper(II) coordination polymers: Syntheses, structures and properties

Liu

Lin

et al. 2022

Polyhedron

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Polytorsional-amide/carboxylates-directed Cd(ii) coordination polymers exhibiting multi-functional sensing behaviors

Abstract: Three (3,5)-connected Cd(ii) coordination polymers induced by polytorsional-amide/carboxylates exhibiting controllable multifunctional fluorescent sensing activities.

Cited by 2 publications

References 79 publications

A Water-Stable Lanthanide-Based MOF as a Highly Sensitive Sensor for the Selective Detection of Paraquat in Agricultural Products

A Water-Stable Lanthanide-Based MOF as a Highly Sensitive Sensor for the Selective Detection of Paraquat in Agricultural Products

Metal and bis(pyridyl)-bis(amide) ligands – tuned three new nickel(II)/copper(II) coordination polymers: Syntheses, structures and properties

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