Layered hydroxide hybrid nanostructures: a route to multifunctionality

Rogez, Guillaume; Massobrio, Carlo; Rabu, Pierre; Drillon, Marc

doi:10.1039/c0cs00159g

Cited by 142 publications

(161 citation statements)

References 179 publications

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“…Indeed, atAt low pH only the more acidic phosphonic acid is bonded to the inorganic network as in compound (2) and (3). On the other hand, the addition of urea in the pressure vessel, increased the pH thus producing a hybrid in which both functional groups were connected via iono-covalent bonds to the inorganic network as illustrated with compound (1). These results also demonstrate the interest of using heterodifunctional organic precursors since hybrids with different topologies can be produced by simply adapting altering the pH of the reaction media.…”

Section: Resultsmentioning

confidence: 86%

“…respectively. With respect to the release capacity, the more open structure of compound (4), is the likely reason of its higher capacity to release silver ions in water solution when compared to compound (1). For the which only the phosphonic acid functional group is linked to the inorganic network, the quantity of silver the released in water was profoundly increased when compared to the behavior of explained by the presence of free carboxylic acid functional groups within the structure that could favor the initial hydration of the materials (2) and (3)leading to an enhancement in their Moreover, it is likely that the stability of these hybrids towards dissolution in polar solvents was is dependent on the number of functional groups that are connected with the inorganic network.…”

Section: Ag3(4-po3-c6h4-coo) (1) Ag(4-po3h-c6h4-cooh) (2) and Ag(3-mentioning

confidence: 99%

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Silver-Based Hybrid Materials from meta- or para-Phosphonobenzoic Acid: Influence of the Topology on Silver Release in Water

et al. 2015

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(Word Style "BD_Abstract").Three novel silver-based Metal Organic Frameworks materials which were synthesized from either 3-phosphono or 4-phosphonobenzoic acid and silver nitrate are reported. The novel hybrids were synthesized under hydrothermal conditions; the pH of the reaction media was controlled by adding different quantities of urea thereby producing different topologies.Compound 1 (Ag3(4-PO3-C6H4-COO)), synthesised in presence of urea, exhibits a compact 3D structure in which both phosphonic acid and carboxylic acid functional groups are linked to the silver-based inorganic network. Compound 2 (Ag(4-PO3H-C6H4-COOH)), which was synthesized at lower pH (without urea), has a layered structure in which only the phosphonic acid functional groups from 4-phosphonobenzoic acid moieties are linked to the silver inorganic network; the carboxylic acid groups being engaged in hydrogen bonds. Finally, material 3 (Ag(3-PO3H-C6H4-COOH)) was synthesised from 3-phosphonobenzoic acid and silver nitrate without urea. This material 3 features a layered structure exhibiting carboxylic acid functional groups linked via hydrogen bonds in the interlayer space. After the full characterization of these materials (single X-ray structure, IR, TGA), their ability to release silver salts in aqueous environment was measured. Silver release, determined in aqueous solution by cathodic stripping voltammetry, shows that the silver release capacity of these materials is dependent on the topology of the hybrids. The more compact structure 1 is extremely stable in water with only trace levels of silver ions being detected. On the other hand, compounds 2 and 3, in which only the phosphonic acid functional groups were bonded to the inorganic network, released larger quantities of silver ions into aqueous solution. These results which were compared with the silver release of the previously described compound 4 (Ag6(3-PO3-C6H4-COO)2). The results clearly show that the release capacity of silver-based metal organic framework can be tuned by 3 modifying their topology which, in the present study, is governed by the regio-isomer of the organic precursor and the synthetic conditions under which the hybrids are prepared.4

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Section: Resultsmentioning

confidence: 86%

Section: Ag3(4-po3-c6h4-coo) (1) Ag(4-po3h-c6h4-cooh) (2) and Ag(3-mentioning

confidence: 99%

Silver-Based Hybrid Materials from meta- or para-Phosphonobenzoic Acid: Influence of the Topology on Silver Release in Water

et al. 2015

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“…The first systems to be covered will be 1D molecules with alternating Gd and radicals which have unique spin frustration conditions and show chiral order, a property of large interest nowadays [20,21]. Similar phenomena are observed in 0D materials in the presence of non-collinear axes.…”

Section: A Nano History Of Molecular Magnetismmentioning

confidence: 73%

Lanthanides in the frame of Molecular Magnetism

Gatteschi

2014

EPJ Web of Conferences

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Abstract. Molecular magnetism is producing new types of materials which cover up to date aspects of basic science together with possible applications. This article highlights recent results from the point of view of lanthanides which are now intensively used to produce single molecule magnets, single chain and single ion magnets. After a short introduction reminding the main steps of development of molecular magnetism, the basic properties of lanthanides will be covered highlighting important features which are enhanced by the electronic structure of lanthanides, like spin frustration and chirality, anisotropy and non collinear axes in zero and one dimensional materials. A paragraph of conclusions will discuss what has been done and theperspectives to be expected. A Nano history of molecular magnetismMolecular magnetism is a relatively recent section of magnetism which evolved from magnetochemistry. Magnetochemistry is the use of magnetic measurements in order to obtain structural information. An example should explain. Nickel(II) has a configuration 3d 8 . A compound with four ligands can have either a tetrahedral or square planar coordination geometry. A ligand field description shows that the five degenerate d orbitals in cubic symmetry remove their degeneracy due to low symmetry effects. The tetrahedral field is weaker than the square planar and the latter forces the electron spins to pair, while the weak tetrahedral keeps two electrons unpaired. A simple magnetic measurement at room temperature decides about the coordination structure. In fact the tetrahedral nickel (II) complexes are paramagnetic and square planar are diamagnetic. A useful technique but nothing more.The change occurred from the 60s of last century when it was realized that molecular chemistry could yield new types of magnetic materials, following the same type of evolution which took place on conductors where the introduction of molecular techniques determined a technological breakthrough.The goal at the beginning was to design and synthesize high T organic ferromagnets, but the challenge appeared soon to be too difficult and in order to start from a less hard field the goal was broadened rapidly to molecular ferromagnets i.e. to materials which may contain metal ions together with organic molecules. The results were promising, teaching how to develop strategies to design and synthesize ferro-or ferri-magnetic coupled molecules. The result was the production of low dimensional magnets while 3D materials were more difficult and the number of molecular magnets working at room temperature did not exceed 2 [1-4]. The critical temperatures of pure organic ferromagnets are still in the 30 K range.Luckily in those years there was a keen interest among physicists towards low D magnets and the exotic molecular magnets attracted the interest of quite a few. The problem was the different languages of the two communities. Physicists for instance needed one-dimensional antiferro-magnets with S> ½ to test the Haldane theory, and the only systems they we...

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“…[21][22][23][24] Before functionalization with organosilanes, BEN was pre-expanded with distilled water. To this end, 5.0 g of clay was added to 100.0 mL of distilled water and vigorously stirred for 1 h. Next, 2.0 mL of one of the alkoxides was added, and the reaction was allowed to proceed under stirring at room temperature for 48 h. The material was then washed with ethanol and water, which was followed by drying at 100 °C for 24 h. The samples were kept in desiccators.…”

Section: Bentonite Functionalizationmentioning

confidence: 99%

Hybrid Materials Based on Bentonite Functionalized with Amine Groups via the Hydrolytic Sol-Gel Method

Gilberto¹,

Marçal²,

Silva³

et al. 2015

Journal of the Brazilian Chemical Society

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Bentonite is a natural clay that presents characteristics such as good capacity to exchange cations, large specific surface area, large porosity, and possibility to undergo intercalation and/or functionalization. This work reports on bentonite functionalization with organomodified alkoxides. Functionalization afforded hybrid materials displaying desirable properties for adsorption of chromium trivalent ions. Infrared absorption spectroscopy, X-ray powder diffraction, thermal analysis, specific surface area analysis, and adsorption experiments with methylene blue helped to characterize the materials and evaluate their cationic exchange capability. These techniques evidenced functionalization of the Brazilian bentonite. Kinetic and equilibrium experiments on the adsorption of chromium trivalent ions aided determination of the equilibrium time of kinetic adsorption isotherms and revealed whether the functionalized matrices adsorbed chromium trivalent ions. Chromium displayed S1 type adsorption isotherms, which confirmed that adsorption capacity originated from cooperative forces between the adsorbate and the hybrid adsorbents.

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Layered hydroxide hybrid nanostructures: a route to multifunctionality

Cited by 142 publications

References 179 publications

Silver-Based Hybrid Materials from meta- or para-Phosphonobenzoic Acid: Influence of the Topology on Silver Release in Water

Silver-Based Hybrid Materials from meta- or para-Phosphonobenzoic Acid: Influence of the Topology on Silver Release in Water

Lanthanides in the frame of Molecular Magnetism

Hybrid Materials Based on Bentonite Functionalized with Amine Groups via the Hydrolytic Sol-Gel Method

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