Synthesis, characterization, and luminescent properties of two new Zr(IV) metal–organic frameworks based on anthracene derivatives

Rowe, Jennifer M.; Soderstrom, Erin M.; Usov, Pavel M.; Morris, Amanda J.

doi:10.1139/cjc-2017-0445

Cited by 8 publications

(2 citation statements)

References 22 publications

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“…In Fig. 5, we show the excitation spectra for Eu-TP, Eu-ND and Eu-AD, and also for an additionally fabricated Eu-ND(2,6) sample where we used 2,6napthalenedicarboxylic acid instead of 1,4napthalenedicarboxylic acid as the organic precursor to check whether the stereochemistry might play some role as well [29]; note that it turned out that the Eu-ND and Eu-ND(2,6) samples showed very similar luminescence characteristics except that the latter exhibited somewhat higher intensities. Our observation of extension of the excitation towards the higher wavelengths with increasing the ligand size is in accordance with the fact that the longer the conjugated hydrocarbon system is the longer is the absorption wavelength [30].…”

Section: Resultsmentioning

confidence: 99%

Effect of carbon backbone on luminescence properties of Eu-organic hybrid thin films prepared by ALD/MLD

et al. 2021

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Here we show that the backbone of the organic ligand has a profound impact on the luminescence characteristics of lanthanide-organic materials. We employ the emerging atomic/molecular layer deposition (ALD/MLD) technique to deposit europium-based thin films where the organic ligands vary in terms of the number of aromatic rings in their backbone (benzene, naphthalene and anthracene). Enlarging the backbone shifts the excitation towards visible wavelengths, but it simultaneously decreases the emission intensity. Moreover, for the Eu-terephthalate films with the single benzene ring as the organic backbone, we investigate the effects of diluting the Eu3+ concentration with Y3+ to reveal that the emission intensity is optimized around 12% Eu3+ concentration. Interestingly, such a dependence of luminescence intensity on the concentration of emitting species suggests that our (Eu,Y)-organic thin films behave more like ionic phosphors than discrete metal–ligand molecules. Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Effect of carbon backbone on luminescence properties of Eu-organic hybrid thin films prepared by ALD/MLD

et al. 2021

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“…As the optical absorption of lanthanide ions falls usually into the UV region, the visible-light absorption of the MOF should result primarily from the aromatic ADEBE (Figure S1). − In comparison with the transition absorption of ADBEB, the optical absorption of the prepared MOF is broadened, due possibly to a ligand to ligand charge transfer interaction. , The band gap energies of the MOF were estimated to be 2.23 eV for 1Gd , 2.26 eV for 1Eu , and 2.24 eV for 1Sm from Tauc plots (Figure d); it is believed that the electronic bands in the MOFs are contributed primarily from the HOMO–LUMO levels of the aromatic ligand. − …”

Section: Resultsmentioning

confidence: 99%

Photoactive Metal–Organic Frameworks for the Selective Synthesis of Thioethers: Coupled with Phosphine to Modulate Thiyl Radical Generation

et al. 2021

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Metal−organic framework (MOF) materials are intriguing photocatalysts to trigger radical-mediated chemical transformations. We report herein the synthesis and characterization of a series of isomorphic MOFs which show a novel structure, wide visible-light absorption, high chemical stability, and specific redox potential. The prepared MOFs were explored for the photoinduced single-electron oxidation of thiol compounds, generating reactive thiyl radicals to afford thioethers via a convenient thiol−olefin reaction. Importantly, we provide a widely applicable strategy by combing a photoactive MOF with phosphine to modulate the generation of thiyl radical in the reaction, thereby producing a single product of the thioether without the formation of a disulfide byproduct due to the dimerization of thiyl radicals. The photocatalytic reaction takes advantage of this strategy, showing great generality where tens of thiols and olefins have been examined as coupling partners. In addition, the strategy has also been demonstrated to be effective for the reactions catalyzed by other MOFs. Mechanism studies reveal that the selective synthesis of C−S products relies on a synergy between the photoinduced generation of a thiyl radical over the MOF and the in situ cleavage of S−S bond into a S−H bond by phosphine. It is notable that the synthesized MOFs show advanced performance in comparison with classical MOFs. The work not only provides a series of novel MOF photocatalysts that are capable of photoinduced thiol−olefin coupling but also indicates the great potential of MOFs for photochemical transformations mediated by reactive radicals.

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Nanosized Porphyrinic Metal–Organic Frameworks for the Construction of Transparent Membranes as a Multiresponsive Optical Gas Sensor

Moscoso,

Romero‐Guerrero,

Rodriguez‐Lucena

et al. 2024

Small Science

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The well‐known and excellent colorimetric sensing capacity of porphyrins, along with the exceptional structural properties of metal–organic frameworks (MOFs), make porphyrin‐based MOFs, such as PCN‐222, ideal candidates for the construction of a chemical sensor based on absorbance. However, to the best of authors’ knowledge, no high‐quality porphyrin‐based MOF gas sensors have been developed to date, most likely due to the difficulties in: 1) preparing nanosized porphyrin‐MOFs to minimize scattering in absorbance measurements; and 2) incorporating MOFs into transparent membranes for practical use. Herein, a simple and fast microwave‐assisted method for preparing high‐quality nanosized PCN‐222 crystals and their metalated derivatives PCN‐222(M) is reported to finely tune the sensing response. Next, the successful dispersion of these PCN‐222(M) nanoparticles into poly(dimethylsiloxane) to create flexible and transparent membranes is demonstrated. This integration yields a multiresponsive optical gas sensor exhibiting excellent sensitivity and the ability to discriminate between various volatile organic compounds via pattern recognition identification.

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Synthesis, characterization, and luminescent properties of two new Zr(IV) metal–organic frameworks based on anthracene derivatives

Cited by 8 publications

References 22 publications

Effect of carbon backbone on luminescence properties of Eu-organic hybrid thin films prepared by ALD/MLD

Effect of carbon backbone on luminescence properties of Eu-organic hybrid thin films prepared by ALD/MLD

Photoactive Metal–Organic Frameworks for the Selective Synthesis of Thioethers: Coupled with Phosphine to Modulate Thiyl Radical Generation

Nanosized Porphyrinic Metal–Organic Frameworks for the Construction of Transparent Membranes as a Multiresponsive Optical Gas Sensor

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