Aqueous- and vapor-phase detection of nitroaromatic explosives by a water-stable fluorescent microporous MOF directed by an ionic liquid

Qin, Jian-Hua; Ma, Bing; Liu, Xiaofei; Lu, Honglin; Dong, Xi‐Yan; Zang, Shuang‐Quan; Hou, Hongwei

doi:10.1039/c5ta00322a

Cited by 163 publications

(68 citation statements)

References 91 publications

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“…In recently, Ln‐MOFs have gained much attention as fluorescent probes and luminescent bioassays for the detection of cations, anions and small molecules, because of their outstanding luminescence features as well as their uniform pore sizes/environments, unparalleled surface areas, excellent thermal and chemical stability, which are convenient for trapping/adsorbing analytes . Luminescent sensors based on Ln‐MOFs always present unique advanced characteristics such as high stability, operability, and recyclability, as well as high sensitivity and excellent selectivity …”

Section: Introductionmentioning

confidence: 99%

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe³⁺ and Cr^VI Anions

Tang

Han

et al. 2019

Chemistry An Asian Journal

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Twon ew three-dimensional (3D) Ln III metal-organic frameworks (MOFs)w ere designed and successfully obtained via as olvothermalr eaction between lanthanide(III) nitrates and as emi-flexiblec arbazole tetracarboxylate acid linker as ah igh-performancec hromophore. 1 and 2 possess porous 3D networks with channels along the a axis, and more importantly,t hey show ah ighly sensitivea nd selective fluorescence quenching response to Fe 3 + and Cr VI anions. The sensing mechanism investigation revealed that the weak interactions of Fe 3 + with nitrogen atoms of carbazole and deprotonated carboxylic acids protruding into the pores of MOFs quenched the luminescence of 1 and 2 effectively. In addition, the competition absorption also playeda ni mportant role in the luminescence quenchingd etection of Fe 3 + based on 1,a nd Cr VI anionsb ased on 1 and 2.T herefore, 1 and 2 represent an alternative example of regenerable luminescence based sensors fort he quantitative detection of Fe 3 + and Cr VI anions.

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Section: Introductionmentioning

confidence: 99%

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe³⁺ and Cr^VI Anions

Tang

Han

et al. 2019

Chemistry An Asian Journal

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“…The efficiency of RET originates from the large spectral overlap between MOF emission and 2,4,6-trinitrophenol (TNP) absorption. To the best of our knowledge, the MOF has a quenching constant comparable to the highest values known for MOF-based sensors for TNP in aqueous medium [21][22][23][24] . This study provides detailed mechanistic insight into the sensing behavior of MOF for analytes, and clarifies the interactions responsible for selectivities of analytes.…”

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confidence: 99%

Mechanistic insight into the sensing of nitroaromatic compounds by metal-organic frameworks

et al. 2019

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There has been extensive research on the sensing of explosive nitroaromatic compounds (NACs) using fluorescent metal-organic frameworks (MOFs). However, ambiguity in the sensing mechanism has hampered the development of efficient explosive sensors. Here we report the synthesis of a hydroxyl-functionalized MOF for rapid and efficient sensing of NACs and examine in detail its fluorescence quenching mechanisms. In chloroform, quenching takes place primarily by exciton migration to the ground-state complex formed between the MOF and the analytes. A combination of hydrogen-bonding interactions and π-π stacking interactions are responsible for fluorescence quenching, and this observation is supported by single-crystal structures. In water, the quenching mechanism shifts toward resonance energy transfer and photo-induced electron transfer, after exciton migration as in chloroform. This study provides insight into florescence-quenching mechanisms for the selective sensing of NACs and reduces the ambiguity regarding the nature of interactions between the MOF and NACs.

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“…On the other hand, ionic liquids have received increasing attention as the solvent of choice for the syntheses of crystalline materials. Ionothermal methods are of interest in coordination chemistry for the preparation of unusual MOFs [13][14][15].…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of catena-(μ₃-5-bromoisophthatato-κO,O′: O′′,O′′′′)-(1,2-bis(imidazol-1-yl)ethane-κN:N′)cobalt(II), C₁₆H₁₃CoN₄O₄Br

Han

Wang

2017

Zeitschrift Für Kristallographie - New Crystal Structures

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CCDC no.: 1580444A part of the polmeric title crystal structure is shown in the figure. (The asymmetric unit is labelled only. ′ = x, 0.5 − y, Tables 1 and 2 contain details on crystal structure and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters. Source of materialA mixture of 5-bromoisophthalic acid (BripH 2 , 24.5 mg, 0.1 mmol), Co(OAc) 2 ·2H 2 O (24 mg, 0.1 mmol), and 1,2-bis(imidazol-1-yl)ethane (bia, 16.2 mg, 0.1 mmol), were added to water (9 mL) and [BMI]Br (BMI = 1-butyl-3-methylimidazolium, 1 mL) in a 25 mL Teflon-lined autoclave. The mixture was heated at 413 K for 3 days and then slowly cooled down to room temperature. Pink block crystals of the title compound were obtained. Experimental detailsThe hydrogen atoms were placed in calculated positions and refined using a riding on attached atoms with isotropic thermal parameters 1.2 times those of their carrier atoms. The U iso values of the hydrogen atoms of methyl groups and oxygen were set to 1.5U eq (C, O).

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Aqueous- and vapor-phase detection of nitroaromatic explosives by a water-stable fluorescent microporous MOF directed by an ionic liquid

Abstract: Aqueous- and vapor-phase detection of nitroaromatic explosives by a water-stable fluorescent microporous MOF directed by an ionic liquid.

Cited by 163 publications

References 91 publications

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe³⁺ and Cr^VI Anions

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe³⁺ and Cr^VI Anions

Mechanistic insight into the sensing of nitroaromatic compounds by metal-organic frameworks

Crystal structure of catena-(μ₃-5-bromoisophthatato-κO,O′: O′′,O′′′′)-(1,2-bis(imidazol-1-yl)ethane-κN:N′)cobalt(II), C₁₆H₁₃CoN₄O₄Br

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Aqueous- and vapor-phase detection of nitroaromatic explosives by a water-stable fluorescent microporous MOF directed by an ionic liquid

Abstract: Aqueous- and vapor-phase detection of nitroaromatic explosives by a water-stable fluorescent microporous MOF directed by an ionic liquid.

Cited by 163 publications

References 91 publications

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe3+ and CrVI Anions

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe3+ and CrVI Anions

Mechanistic insight into the sensing of nitroaromatic compounds by metal-organic frameworks

Crystal structure of catena-(μ3-5-bromoisophthatato-κO,O′: O′′,O′′′′)-(1,2-bis(imidazol-1-yl)ethane-κN:N′)cobalt(II), C16H13CoN4O4Br

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A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe³⁺ and Cr^VI Anions

A Highly Sensitive and Recyclable Ln‐MOF Luminescent Sensor for the Efficient Detection of Fe³⁺ and Cr^VI Anions

Crystal structure of catena-(μ₃-5-bromoisophthatato-κO,O′: O′′,O′′′′)-(1,2-bis(imidazol-1-yl)ethane-κN:N′)cobalt(II), C₁₆H₁₃CoN₄O₄Br