Ammonia detection by using flexible Lewis acidic sites in luminescent porous frameworks constructed from a bipyridinium derivative

Chen, Cheng; Cai, Li‐Xuan; Tan, Bin; Zhang, Yajun; Yang, Xiaodong; Zhang, Jie

doi:10.1039/c5cc01239b

Cited by 66 publications

(54 citation statements)

References 44 publications

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“…The gas coordination effect can not only quench the luminescence of the lanthanide metal ions but also perturb the excited state energy of the organic fluorophore . For example, Dincaˇ et al reported two MOFs [Zn 2 (tcpe)(H 2 O) 2 ]·4DEF and [Mg(H 2 dhbdc)(DMF) 2 ] (H 4 tcpe = tetrakis(4‐carboxyphenyl)ethylene, DEF = N , N ‐diethylformamide, H 4 dhbdc = 2,5‐dihydroxybenzene‐1,4‐dicarboxylic acid) showing shifts of emission wavelengths upon interaction with ammonia at 100 °C ( Figure ) .…”

Section: Coordinative Guestsmentioning

confidence: 99%

Photoluminescent Metal–Organic Frameworks for Gas Sensing

et al. 2016

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Luminescence of porous coordination polymers (PCPs) or metal–organic frameworks (MOFs) is sensitive to the type and concentration of chemical species in the surrounding environment, because these materials combine the advantages of the highly regular porous structures and various luminescence mechanisms, as well as diversified host‐guest interactions. In the past few years, luminescent MOFs have attracted more and more attention for chemical sensing of gas‐phase analytes, including common gases and vapors of solids/liquids. While liquid‐phase and gas‐phase luminescence sensing by MOFs share similar mechanisms such as host‐guest electron and/or energy transfer, exiplex formation, and guest‐perturbing of excited‐state energy level and radiation pathways, via various types of host‐guest interactions, gas‐phase sensing has its unique advantages and challenges, such as easy utilization of encapsulated guest luminophores and difficulty for accurate measurement of the intensity change. This review summarizes recent progresses by using luminescent MOFs as reusable sensing materials for detection of gases and vapors of solids/liquids especially for O2, highlighting various strategies for improving the sensitivity, selectivity, stability, and accuracy, reducing the materials cost, and developing related devices.

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Section: Coordinative Guestsmentioning

confidence: 99%

Photoluminescent Metal–Organic Frameworks for Gas Sensing

et al. 2016

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“…The characteristic peaks at 1638 cm À 1 for 1, 1635 cm À 1 for 2, 1639 cm À 1 for 3 are attributed to viologen ligands. [25]…”

Section: Resultsmentioning

confidence: 99%

A Series of Polyoxometalate‐Viologen Photochromic Materials for UV Probing, Amine Detecting and Inkless and Erasable Printing

Ying

Jin

Sun

et al. 2021

Chemistry A European J

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In this work, by using two kinds of viologen ligands three POM-based Compounds were obtained under hydrothermal conditions, namely [Ag I (bmypd) 0.5 (β-Mo 8 O 26 ) 0.5 ] (1)The structures were characterized by Fourier transform infrared spectroscopy (FT-IR), Powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS) and single crystal X-ray diffraction. Compounds 1-3 show excellent photochromic ability with fast photoresponse under the irradiation of ultraviolet light with different degrees of color changes. So compounds 1-3 can be used as visible ultraviolet detectors. Compounds 1-3 also possess photoluminescence properties with fast and excellent fluorescence quenching effect. Compounds 1-3 also can be used as inkless and erasable printing materials with suspensions of 1-3 applied to filter paper. Compounds 1-3 can also produce color changes in amine vapor environment, especially in an NH 3 atmosphere. Compounds 1-3 can be used as organic amine detectors.

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“…Herein, the number of CUMSs was determined through surface acid site titration employing NH 3 as probe molecule. NH 3 is an ideal probe molecule since it is small (kinetic diameter of 2.6 Å) and allows titration of weak acid sites [90]. Total surface acidity was assessed from the net weight gain recorded after an isothermal adsorption step of NH 3 at 100 • C followed by removal of physisorbed molecules with a He stream.…”

Section: Density Of Coordinatively Unsaturated Metal Sites (Cumss)mentioning

confidence: 99%

Porous Hexacyanometallate(III) Complexes as Catalysts in the Ring-Opening Copolymerization of CO2 and Propylene Oxide

2021

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In this work, six porous hexacyanometallate complexes (Ni3[Co(CN)6]2, Co3[Co(CN)6]2, Fe3[Co(CN)6]2, Ni3[Fe(CN)6]2, Co3[Fe(CN)6]2, Fe4[Fe(CN)6]2) were synthesized by a complexing agent assisted coprecipitation method and thoroughly characterized via X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), in situ high-temperature X-ray diffraction (HT-XRD), elemental analysis (EA), X-ray fluorescence (XRF), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 physisorption, and gas–solid phase titration with NH3. The thermal stability, chemical composition, pore size and volume, crystallite size and density of surface acid sites were strongly sensitive to both the transition metal and the cyanometallate anion employed. On that basis, transition metal hexacyanometallates must be perceived as an adaptable class of zeolite-like microporous materials. The catalytic properties of these compounds were tested by copolymerization of propylene oxide and CO2, a green route to obtain biodegradable aliphatic polycarbonates. All compounds under study showed moderate activity in the target reaction. The obtained copolymers were characterized by modest CO2 content (carbonate units ranging from 16 to 33%), random structure (RPEC ≈ 70%), and moderate molecular weight (Mw = 6000–85,400 g/mol) with broad dispersity values (ĐM = 4.1–15.8).

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Ammonia detection by using flexible Lewis acidic sites in luminescent porous frameworks constructed from a bipyridinium derivative

Cited by 66 publications

References 44 publications

Photoluminescent Metal–Organic Frameworks for Gas Sensing

Photoluminescent Metal–Organic Frameworks for Gas Sensing

A Series of Polyoxometalate‐Viologen Photochromic Materials for UV Probing, Amine Detecting and Inkless and Erasable Printing

Porous Hexacyanometallate(III) Complexes as Catalysts in the Ring-Opening Copolymerization of CO2 and Propylene Oxide

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