Fluorescence enhancement of a tetrazole-based pyridine coordination polymer hydrogel

Lee, Ji Ha; Lee, Hyejin; Seo, Sung Chul; Jaworski, Justyn; Seo, Moo Lyong; Kang, Sunwoo; Lee, Jin Yong; Jung, Jong Hwa

doi:10.1039/c0nj00840k

Cited by 34 publications

(23 citation statements)

References 45 publications

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“…27 Tetrazole derivatives, with multiple binding sites, promote cross-linking to form a polymer network, a condition that is critical for gelation. 28 We have undertaken the investigation of nanomaterials that combine tetrazole and pyridyl groups. [28][29][30] Recent investigations have focused on the templation of metallic and semiconductor nanoparticles using a gel network that functions not only as a coordinating substrate for preprepared nanoparticles, 31,32 but also serves as the medium that directs the in situ synthesis of the nanosized materials.…”

Section: Introductionmentioning

confidence: 99%

A tetrazole-based metallogel induced with Ag+ ion and its silver nanoparticle in catalysis

et al. 2012

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A tetrazole-based ligand forms a supramolecular metallogel in the presence of Ag + in aqueous solution at basic condition. The silver-induced metallogel has been characterized by SEM, TEM, XRD and rheometry. The metallogel exhibits a fiber structure. Upon standing, silver nanoparticles grow in the gel. TEM confirmed that the particles are exclusively formed in the gel fibers. The size of the silver nanoparticles formed on the gel fibers is dependent to the concentration of silver during gel formation. The silver nanoparticles show a face-centered cubic crystalline structure. The silver nanoparticles can effectively catalyze reduction of 4-nitrophenol by sodium borohydride in aqueous solution. The formation of Ag + -induced metallogels does not strongly depend on anions. According to DFT calculations, two silver cations are coordinated to nitrogen at the tetrazole moiety. The other silver cation is coordinated to the nitrogen of the pyridine and coordinated to the oxygen of the amide moiety. Furthermore, the rheological properties of the Ag + -tetrazole-based metallogel were strongly dependent on the concentration of AgClO 4 .

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Section: Introductionmentioning

confidence: 99%

A tetrazole-based metallogel induced with Ag+ ion and its silver nanoparticle in catalysis

et al. 2012

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“…37,38 This yields an opportunity to interconnect the particles with the aid of metal ions leading to a 3D structure. 39 This nonclassical gelation is a controllable and reversible method and has not been applied for silica gels so far. The resulting hydrogel is a very porous non-ordered network as can be seen in the TEM image (Figure 2 B).…”

Section: Resultsmentioning

confidence: 99%

3D assembly of silica encapsulated semiconductor nanocrystals

et al. 2015

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Non-ordered porous networks, so-called aerogels, can be achieved by the 3D assembly of quantum dots (QDs). These materials are well suited for photonic applications, however a certain quenching of the photoluminescence (PL) intensity is observed in these structures. This PL quenching is mainly attributed to the energy transfer mechanisms that result from the close contact of the nanoparticles in the network. Here, we demonstrate the formation of a novel aerogel material with non-quenching PL behaviour by non-classical, reversible gel formation from tetrazole capped silica encapsulated QDs. Monitoring of the gelation/degelation by optical spectroscopy showed that the optical properties of the nanocrystals could be preserved in the 3D network since no spectral shifts and lifetime shortening, which can be attributed to the coupling between QDs, are observed in the gels as compared to the original colloidal solutions. In comparison with other QD-silica monoliths, QDs in our gels are homogeneously distributed with a distinct and controllable distance. In addition we show that the silica shell is porous and allows metal ions to pass through the shell and interact with the QD core causing detectable changes of the emission properties. We further show the applicability of this gelation method to other QD materials which sets the stage for facile preparation of a variety of mixed gel structures.

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“…1, excitation at 270 nm leads to emission bands with maximum intensity at 294 nm for HL and 1 under the same conditions. The fluorescent emissions of HL and 1 can be tentatively assigned to intraligand fluorescence emission [29][30][31]. Compared to the free ligand, 2D polymeric structure lead to enhancement of fluorescent intensity, because in polymeric structure the rigidity of the ligands effectively increases and the loss of energy by radiation less decay reduces [32,33].…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

In situ hydrothermal synthesis of 2D zinc-tetrazolate framework and hydrothermal conversion of framework to ZnO nano and micro-structures

Jahani

Dehghanpour

Lipkowski

2015

Main Group Chemistry

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Fluorescence enhancement of a tetrazole-based pyridine coordination polymer hydrogel

Cited by 34 publications

References 45 publications

A tetrazole-based metallogel induced with Ag+ ion and its silver nanoparticle in catalysis

A tetrazole-based metallogel induced with Ag+ ion and its silver nanoparticle in catalysis

3D assembly of silica encapsulated semiconductor nanocrystals

In situ hydrothermal synthesis of 2D zinc-tetrazolate framework and hydrothermal conversion of framework to ZnO nano and micro-structures

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