Nanoscale Metal–Organic Frameworks and Metal–Organic Layers with Two-Photon-Excited Fluorescence

Hu, Xuefu; Wang, Zhiye; Su, Yuming; Chen, Peican; Chen, Jiawei; Zhang, Cankun; Wang, Cheng

doi:10.1021/acs.inorgchem.0c00373

Cited by 16 publications

(14 citation statements)

References 30 publications

(37 reference statements)

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“…As shown in the figure, the 2θ diffraction angle peak positions of the simulated XRD pattern and the synthesised samples Eu-MOF, Tb-MOF, and Eu 0.075 Tb 0.925 -MOF are the same, and there are sharp peaks at the diffraction angles from 9 to 10. At the same time, the diffraction peaks 9 to 10 of the crystal synthesised by Silva et al [36] are basically the same, indicating that the synthesised Eu 0.075 Tb 0.925 -MOF has high purity and good crystallinity [36][37][38][39].…”

Section: Xrd Characterisationmentioning

confidence: 59%

Preparation of Eu0.075Tb0.925-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe3+ and Cr2O72−

Yin

Chu

Qin

et al. 2021

Sensors

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Luminescent Ln-MOFs (Eu0.075Tb0.925-MOF) were successfully synthesised through the solvothermal reaction of Tb(NO3)3·6H2O, Eu(NO3)3·6H2O, and the ligand pyromellitic acid. The product was characterised by X-ray diffraction (XRD), TG analysis, EM, X-ray photoelectron spectroscopy (XPS), and luminescence properties, and results show that the synthesised material Eu0.075Tb0.925-MOF has a selective ratio-based fluorescence response to Fe3+ or Cr2O72−. On the basis of the internal filtering effect, the fluorescence detection experiment shows that as the concentration of Fe3+ or Cr2O72− increases, the intensity of the characteristic emission peak at 544 nm of Tb3+ decreases, and the intensity of the characteristic emission peak at 653 nm of Eu3+ increases in Eu0.075Tb0.925-MOF. The fluorescence intensity ratio (I653/I544) has a good linear relationship with the target concentration. The detection linear range for Fe3+ or Cr2O72− is 10–100 μM/L, and the detection limits are 2.71 × 10−7 and 8.72 × 10−7 M, respectively. Compared with the sensor material with a single fluorescence emission, the synthesised material has a higher anti-interference ability. The synthesised Eu0.075Tb0.925-MOF can be used as a highly selective and recyclable sensing material for Fe3+ or Cr2O72−. This material should be an excellent candidate for multifunctional sensors.

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Section: Xrd Characterisationmentioning

confidence: 59%

Preparation of Eu0.075Tb0.925-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe3+ and Cr2O72−

Yin

Chu

Qin

et al. 2021

Sensors

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Section: Phase‐dependent Applications Of Mofsmentioning

confidence: 99%

“…Recently, Hu et al found that not only the phase but also the morphology of UiO MOFs could be tuned by the addition of water or/and modulator acid. [58] fcu UiO(Zr) MOF with octahedral morphology was synthesized by using 4,4′-(9,10anthracenediyl)dibenzoic acid (H 2 DCDPA) as the linker and ZrCl 4 as the metal precursor in a mixture of DMF and acetic acid. If acetic acid was changed to trifluoroacetic acid, the shape of fcu UiO(Zr) became hexagonal nanoplate.…”

Section: Ditopic Carboxylate Ligand-based Zr/hf-mofsmentioning

confidence: 99%

“…[97] Notably, different phases of MOFs represent various node connectivity and symmetry of the linkers, which could also modify the luminescent performances of MOFs. [58] For example, Deria et al investigated the phasedependent emissive properties of two Zr-based MOFs (scu NU-902 and ftw MOF-525). [98] They found that the emissive spectral properties of MOFs are dependent on the phase of MOFs, which can affect the interchromophoric orientation and interactions and therefore cause the shift of spectra.…”

Section: Luminescencementioning

confidence: 99%

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Phase engineering of metal‐organic frameworks

Zheng

Wang

et al. 2021

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As an important category of porous crystalline materials, metal‐organic frameworks (MOFs) have attracted extensive research interests owing to their unique structural features such as tunable pore structure and enormous surface area. Besides controlling the size, dimensionality, and composition of MOFs, further exploring the crystal‐phase‐dependent physicochemical properties is essential to improve their performances in various applications. Recently, great progress has been achieved in the phase engineering of nanomaterials (PEN), which provides an effective strategy to tune the functional properties of nanomaterials by modulating the arrangement of atoms. In this review, we adopt “phase” instead of “topology” to describe the crystal structure of MOFs and summarize the recent advances in phase engineering of MOFs. The two main strategies used to control the phase of MOFs, that is, phase‐controlled synthesis and phase transformation of MOFs, will be highlighted. The roles of various reaction parameters in controlling the crystal phase of MOFs are discussed. Then, the phase dependence of MOFs in various applications including luminescence, adsorption, and catalysis are introduced. Finally, some personal perspectives about the challenges and opportunities in this emerging field are presented.

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“…[165] Moreover, a lot of similar Zr-MOFs with fcu topology have been documented in past two years. [166][167][168][169][170][171][172][173][174][175][176] Linker elongation is one of the most important strategies to obtain MOFs with large pore sizes. However, fcu Zr-MOFs tend to interpenetrate with increase of linker sizes.…”

Section: Zr-mofs Based On Ditopic Linkersmentioning

confidence: 99%

Metal–Organic Frameworks Based on Group 3 and 4 Metals

et al. 2020

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Metal-organic frameworks (MOFs), a class of porous crystalline framework materials, are linked by strong bonds between inorganic and organic building blocks. [1-3] In the past two decades, MOFs have rapidly grown as a star material due to their exceptional performance in areas such as storage, separation and catalysis. [4] The outstanding performance of MOFs in applications benefits from their intrinsically porous structures and highly tunable pore environment. [5-7] The creation and modification of pore space with optimized size, functionality and diversity can be precisely tuned at the molecular level by rationally designing building blocks and synthetic procedures. [8,9] The diversity of MOFs can be enriched by expanding the library of organic linkers with varying lengths, geometries, and functional groups. [10] Additionally, very diverse metal cations are applied to MOF synthesis, ranging from monovalent (Ag + , Cu + , etc.), divalent (Mg 2+ , Fe 2+ , Co 2+ , Ni 2+ , etc.), trivalent (Al 3+ , Sc 3+ , V 3+ , Cr 3+ , etc.), to tetravalent (Ti 4+ , Zr 4+ , Hf 4+ , etc.) cations. [11] In this review, we mainly focus on MOFs with group 3 and 4 metals, including Y, lanthanides (Ln, from La to Lu), actinides (An, from Ac to Lr), Ti, and Zr (Figure 1). Group 3 metal cations are generally found in the oxidation state of +3 in the MOF structures, while group 4 metal cations mainly exist in the oxidation state of +4, leading to the formation of much stronger coordination bonds with carboxylates. [12] Therefore, group 4 metal-based MOFs (M IV-MOFs) generally have enhanced stability compared with MOFs constructed from metals of group 3 and other groups. This series of MOFs stands out because the involved metals can generally coordinate with carboxylates to form frameworks with strong coordination bonds, according to the Pearson's hard/soft acid/base principle, where group 3 and 4 metal cations are regarded as hard acids while carboxylate ligands are hard bases. [11] One remarkable feature of MOFs with group 3 and 4 metals is that they generally can form phases containing M 6 O 8 (M = Y, Ln, An, Zr and Hf) clusters, regardless of their atomic numbers, charges and radius. This series of M 6-based MOFs is best represented by UiO series such as UiO-66 with fcu topology. [13] Under different synthetic conditions, UiO-66(M, M = An, Zr and Hf) constructed from [M 6 (μ 3-O) 4 (μ 3-OH) 4 ] clusters and linear carboxylates can be obtained, while UiO-66(M, M = Y, Ln) is assembled from Metal-organic frameworks (MOFs) based on group 3 and 4 metals are considered as the most promising MOFs for varying practical applications including water adsorption, carbon conversion, and biomedical applications. The relatively strong coordination bonds and versatile coordination modes within these MOFs endow the framework with high chemical stability, diverse structures and topologies, and interesting properties and functions. Herein, the significant progress made on this series of MOFs since 2018 is summarized and an update on the current status an...

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Nanoscale Metal–Organic Frameworks and Metal–Organic Layers with Two-Photon-Excited Fluorescence

Cited by 16 publications

References 30 publications

Preparation of Eu0.075Tb0.925-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe3+ and Cr2O72−

Preparation of Eu0.075Tb0.925-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe3+ and Cr2O72−

Phase engineering of metal‐organic frameworks

Metal–Organic Frameworks Based on Group 3 and 4 Metals

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