An insight study into the parameters altering the emission of a covalent triazine framework

Bika, Panagiota; Giannakopoulou, T.; Osokin, Vitaly; Li, Mo; Todorova, N.; Kaidatzis, Andreas; Taylor, Robert A.; Trapalis, Christos; Dallas, Panagiotis

doi:10.1039/d1tc02985a

Cited by 4 publications

(13 citation statements)

References 78 publications

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“…Furthermore, our group demonstrated that the bulk layered network could undergo an exfoliation process toward few-layered sheets or nanostructures through sonication in aqueous or tetrahydrofuran dispersions. 35 With respect to the well-known tendency of pyridine moieties to form coordination complexes with divalent copper, we examined the ability of the frameworks to absorb copper. The networks reacted immediately with copper ions, and an insoluble precipitate was immediately formed.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Depending on the geometry of the central core, the network can grow in two or three dimensions. Furthermore, our group demonstrated that the bulk layered network could undergo an exfoliation process toward few-layered sheets or nanostructures through sonication in aqueous or tetrahydrofuran dispersions …”

Section: Results and Discussionmentioning

confidence: 99%

“…Exfoliation of the C 3 N 3 Network. The layered C 3 N 3 triazinebased network was exfoliated in an aqueous dispersion according to a previously published procedure by Bika et al 35 The exfoliated material is denoted as C 3 N 3 -EXF, and its respective copper complex is denoted as C 3 N 3 -EXF-Cu.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Τhe complexes were formed in aqueous solutions by mixing an aqueous dispersion of the COFs and the CuCl 2 solution in a 1:2 molar ratio, which was also dissolved in water. The pH of the COFs' dispersion is acidic with a value of 3.5, 35 thus excluding the presence of copper hydroxides. The complex of P 3 N 3 -BULK-Cu was formed and instantly precipitated, whereas the mixtures of C 3 N 3 -BULK-Cu and C 3 N 3 -EXF-Cu were left for 15 min under stirring at ambient conditions.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Copper Coordination and the Induced Morphological Changes in Covalent Organic Frameworks

et al. 2022

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In this work, we reveal the coordination of copper ions absorbed by a series of covalent organic frameworks. The frameworks were synthesized through the nucleophilic substitution of either cyanuric chloride or phosphonitrilic chloride trimer by 4,4′-bipyridine, and they were utilized as absorbers for the removal of copper ions from aqueous solutions. The exfoliated counterpart of the layered network was compared to the bulk materials in terms of the copper retention capacity and efficiency. The ion absorption capacity of copper ranged from 100 to 290 mg/g depending on the morphology and chemical structure of the framework. As evidenced by the SEM and XRD analysis, the copper absorption induced certain morphological changes in the networks. EPR spectroscopy revealed the key finding of this study: the trigonal bipyramidal configuration of the copper ions in their divalent state, coordinated with the nitrogen of the core units, 4,4′-bipyridine, and chlorine ions. The analysis of the thoroughgoing experiments bridges the gap between coordination molecular chemistry and the field of covalent organic frameworks. EPR explores how the unique trigonal bipyramidal coordination could be suppressed in the end by the environment and, more specifically, by the addition of glycerol to the aqueous dispersions of the covalent organic frameworks.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Copper Coordination and the Induced Morphological Changes in Covalent Organic Frameworks

et al. 2022

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“…The structure, morphology, and chemical composition of the g-C 3 N 4 material and the bCOF have been previously described in references of Papailias et al [25] and Bika et al [32]. The FTIR spectra of the pristine and heterojunction materials with the three different ratios are presented in the order of (i) g-C 3 N 4 , (ii) HJ(1:10), (iii) HJ(1:1), (iv) HJ(10:1), and (v) bCOF, in Figure 1a (range: 500-2000 cm −1 ) and Figure S2 (range: 400-4000 cm −1 ).…”

Section: Chemical and Structural Characterisationmentioning

confidence: 99%

Prominent COF, g-C3N4, and Their Heterojunction Materials for Selective Photocatalytic CO2 Reduction

Bika,

Papailias,

Giannakopoulou

et al. 2023

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New heterojunction materials (HJs) were synthesized in-situ by molecularly bonding the monomers of a triazine-based covalent organic framework (bulk COF) on the template of exfoliated carbon nitride (g-C3N4). The photocatalysts reduced carbon dioxide to carbon monoxide in aqueous dispersions under UV irradiation. The g-C3N4 showed production of 6.50 μmol CO g−1 h−1 and the bulk COF of 2.77 μmol CO g−1 h−1. The CO yield was evaluated in sustainability photoreduction cycles and their CO2 uptake capacity and isosteric heat of adsorption were estimated. All the heterojunction photocatalysts obtained ameliorated CO production rates compared to the bulk COF. Finally, the influence of the Pt co-catalyst on the photocatalytic activities was determined without the addition of any sacrificial agent, and the COF:g-C3N4 heterojunction with the ratio of 1:10 was proven to be a photocatalytic system with an optimum and selective, CO yield of 7.56 μmol g−1 h−1.

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Porous organic polymers: a progress report in China

et al. 2023

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An insight study into the parameters altering the emission of a covalent triazine framework

Abstract: Covalent triazine frameworks (CTFs) synthesized through nucleophilic substitution of 4,4’ bipyridine on the carbon atoms of cyanuric chloride were studied as fluorescent sensors. The band gap of the materials was...

Cited by 4 publications

References 78 publications

Copper Coordination and the Induced Morphological Changes in Covalent Organic Frameworks

Copper Coordination and the Induced Morphological Changes in Covalent Organic Frameworks

Prominent COF, g-C3N4, and Their Heterojunction Materials for Selective Photocatalytic CO2 Reduction

Porous organic polymers: a progress report in China

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