A stable luminescent hybrid mesoporous copper complex–silica

Rico, Marisa; Sepúlveda, Ángel E.; Ruiz, Santiago Gómez; Serrano, Elena; Berenguer, Jesús R.; Lalinde, Elena; García‐Martínez, Javier

doi:10.1039/c2cc32963h

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…MSU-X silica was synthesized at room temperature following previously reported procedures [29,30]. In a typical synthesis, 5.7 g of Triton X-100 (9 mmol) was magnetically stirred in 285 mL of distilled water until a clear solution was obtained.…”

Section: Synthesis Of Msu-x Silica Materialsmentioning

confidence: 99%

“…These values were consistent with the UV-Vis analysis performed in the filtrates. The FTIR spectra obtained for the MSU-X silica before and after the TOC loading (Figure 1) presented the characteristic silica absorption bands centred at~1040 cm −1 corresponding to the vibration stretching and bending modes of the Si-O-Si bonds, along with the absorptions at 970 cm −1 and 3500 cm −1 , corresponding to the vibrations of silanol groups [29,30]. The spectrum of the silica impregnated with TOC also showed the characteristic bands of the TOC centred at 3390 cm −1 (hydroxyl groups), 2927 and 2868 cm −1 (symmetric and asymmetric vibration of CH 2 and CH 3 , respectively), 1461 cm −1 (phenyl skeletal), 1379 cm −1 (methyl symmetric bending) and 1280 cm −1 (methylene groups).…”

Section: Characterization Of Msu-x-toc (Imp) Materialsmentioning

confidence: 99%

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Biodegradable Poly(ε-Caprolactone) Active Films Loaded with MSU-X Mesoporous Silica for the Release of α-Tocopherol

et al. 2020

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In this study, new active PCL (poly(ε-caprolactone)) films containing α-tocopherol (TOC) and MSU-X mesoporous silica were prepared by melt blending. The studied additives were directly incorporated into the polymer matrix or by impregnating TOC into MSU-X silica (PCL-IMP). Thermal, optical, oxygen and water barrier properties as well as oxidation onset parameters, were studied. Films containing MSU-X and/or TOC showed a significant increase in oxidative onset temperature (OOT) and oxidative induction time (OIT), improving thermal stability against materials oxidation by the addition of mesoporous silica and TOC into the polymer matrix. In addition, the effect of MSU-X addition on the migration behaviour of α-tocopherol from active films was investigated at 40 °C using 50% (v/v) ethanol as fatty food simulant, showing PCL-IMP films the lower release content and diffusion coefficient (3.5 × 10−15 cm2 s−1). Moreover, radical scavenging (DPPH and ABTS) and antibacterial activity against E. coli and S. aureus were favoured by the release of α-tocopherol in the developed films. The obtained results have demonstrated the potential of the new PCL-based active formulations for TOC controlled release in antioxidant and antibacterial food packaging applications.

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Section: Synthesis Of Msu-x Silica Materialsmentioning

confidence: 99%

Section: Characterization Of Msu-x-toc (Imp) Materialsmentioning

confidence: 99%

Biodegradable Poly(ε-Caprolactone) Active Films Loaded with MSU-X Mesoporous Silica for the Release of α-Tocopherol

et al. 2020

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“…Our approach, which is not based on the partial reduction of titania, consists of the incorporation of dyes into the anatase framework during their synthesis through the so‐called “Sol–Gel coordination chemistry” . By using this technique, we have synthesised a wide range of highly efficient and stable heterogeneous catalysts based on hybrid mesoporous metal complex–metal oxide systems . In the case of titania‐based materials, this novel synthetic approach takes advantage of organic or coordination compounds (dyes) able to coordinate to the Ti IV atom of titanium alkoxides to form multimetal coordination compounds, which will be subsequently used as organotitania precursors.…”

Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

et al. 2018

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A series of low‐temperature, visible‐light‐activated black organotitanias were synthesised through a sol–gel strategy that allowed the in situ incorporation of p‐phenylenediamine (PPD) into the framework of anatase nanoparticles. The effect of the synthetic conditions on the crystalline structure and photocatalytic activity of these materials was assessed by several characterisation techniques, which revealed a small crystalline domain size (4.6–5.5 nm), effective incorporation of PPD inside the nanoparticles, and a significant reduction in the band gap of these materials (from 3.2 to 2.7–2.9 eV). A systematic study of the synthetic parameters also allowed a significant reduction of the solvent used for the preparation of these black organotitanias (20‐fold), as well as the crystallisation time, without compromising the structural properties and photocatalytic activity of these materials. The organotitanias with the highest PPD content and high crystallinity result in the best performing materials in the photocatalytic degradation of rhodamine 6G under both UV‐ and visible‐light irradiation.

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“…So far, however, such an approach has been restricted to the use of rather expensive and non‐ecologically friendly metals. The possibility to replace the rare metals with more abundant emitters has recently been the subject of many studies and in particular copper complexes are promising candidates . The interest in Cu(I) compounds, beyond the availability of copper on earth, is related to their interesting properties: good tunability of their emission colors, long‐lived 3 MLCT excited states, low cost and a relatively friendly impact to the environment .…”

Section: Introductionmentioning

confidence: 99%

“…copper complexes are promising candidates. [15] The interest in Cu(I) compounds, beyond the availability of copper on earth, is related to their interesting properties: good tunability of their emission colors, [16 -18] long-lived 3 MLCT excited states, low cost and a relatively friendly impact to the environment. [19] Nevertheless, an improvement of their photoluminescence quantum yield (PLQY), and even more stringent, a better stability, are required in order to apply such emitters in optical devices.…”

Section: Introductionmentioning

confidence: 99%

Selective Encapsulation and Enhancement of the Emission Properties of a Luminescent Cu(I) Complex in Mesoporous Silica

Donato

Atoini

Prasetyanto

et al. 2018

Helvetica Chimica Acta

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We describe a synthetic approach to prepare new luminescent silica‐based materials through the encapsulation of a neutral copper(I) complex inside the pores of mesoporous silica nanoparticles (MSN). The copper(I) complex is present, in the solid state, as two polymorphs, blue and yellow emissive, and in solution it shows a pale yellow color that is also mirrored by an emission in the yellow‐orange region of the electromagnetic spectrum. The X‐ray structures of single crystals have been obtained for both polymorphs. The complex encapsulation in MSN is achieved by its entrapment inside micelles followed by condensation of the silica source. Interestingly, the entrapment leads to the isolation of only one species. Indeed, the compound inside the MSN exhibits remarkable photophysical properties, showing an intense blue emission in solution and in the solid state. Powder X‐ray diffraction of the hybrid materials proves that the complex entrapped in MSN is indeed the blue polymorph. The confinement provides not only a method to isolate only one form of the complex, but also a certain rigidity, more stability of the system by protection of the complex from undesirable oxidation, leading to a highly emissive material possessing a photoluminescence quantum yield of 65%.

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A stable luminescent hybrid mesoporous copper complex–silica

Abstract: Surfactant-assisted co-condensation of an emissive tetranuclear alkynyl-phosphine copper cluster with TEOS affords a hydrothermally stable blue-emitter mesoporous hybrid metal complex-silica material.

Cited by 15 publications

References 16 publications

Biodegradable Poly(ε-Caprolactone) Active Films Loaded with MSU-X Mesoporous Silica for the Release of α-Tocopherol

Biodegradable Poly(ε-Caprolactone) Active Films Loaded with MSU-X Mesoporous Silica for the Release of α-Tocopherol

Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

Selective Encapsulation and Enhancement of the Emission Properties of a Luminescent Cu(I) Complex in Mesoporous Silica

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