A novel nanostructured composite formed by interaction of copper octa(3-aminopropyl)octasilsesquioxane with azide ligands: Preparation, characterization and a voltammetric application

Carmo, Devaney Ribeiro do; Paim, Leonardo Lataro; Metzker, Gustavo; Filho, Newton Luiz Dias; Stradiotto, Nelson Ramos

doi:10.1016/j.materresbull.2010.05.005

Cited by 23 publications

(8 citation statements)

References 38 publications

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“…If a POSS is inserted between layered perovskites, it may enhance their properties and functionality. To date, complexes of POSS and metal halides or metals have been reported, − and the formation of random siloxane networks between perovskite layers has been attempted. , However, this report presents a completely different approach. We form layered POSS–metal halide hybrid perovskites using a propylammonium-functionalized POSS (A–POSS) and several metal halides under ambient conditions and then evaluate the physical properties of the resultant layered perovskites.…”

Section: Introductionmentioning

confidence: 95%

Layered Hybrid Perovskites with Micropores Created by Alkylammonium Functional Silsesquioxane Interlayers

et al. 2015

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Layered organic-inorganic hybrid perovskites that consist of metal halides and organic interlayers are a class of low-dimensional materials. Here, we report the fabrication of layered hybrid perovskites using metal halides and silsesquioxane with a cage-like structure. We used a silsesquioxane as an interlayer to produce a rigid structure and improve the functionality of perovskite layers. Propylammonium-functionalized silsesquioxane and metal halide salts (CuCl2, PdCl2, PbCl2, and MnCl2) were self-assembled to form rigid layered perovskite structures with high crystallinity. The rigid silsesquioxane structure produces micropores between the perovskite layers that can potentially be filled with different molecules to tune the dielectric constants of the interlayers. The obtained silsesquioxane-metal halide hybrid perovskites exhibit some characteristic properties of layered perovskites including magnetic ordering (CuCl4(2-) and MnCl4(2-)) and excitonic absorption/emission (PbCl4(2-)). Our results indicate that inserting silsesquioxane interlayers into hybrid perovskites retains and enhances the low-dimensional properties of the materials.

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Section: Introductionmentioning

confidence: 95%

Layered Hybrid Perovskites with Micropores Created by Alkylammonium Functional Silsesquioxane Interlayers

et al. 2015

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“…For the synthesis of PAA-13 the procedure in the literature 144 was followed with slight modification, and the results obtained were compared to the reported ones, which were quite close to the expected results.…”

Section: Synthesis Of Paa-13: Si 8 O 12 [(Ch 2 ) 3 Nh 2 ]supporting

confidence: 70%

Functionalized polyhedral oligomeric silsesquioxane (POSS) for incorporation of chemically pendant chains = Utilização de silsesquioxanos oligoméricos poliédricos funcionalizados (POSS) no ancoramento de cadeias orgânicas à superfície

Riaz¹,

Simoni²

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This report presents the synthesis and characterization of POSS compounds having cubic silsesquioxane cage to which the organic pendant chains are anchored. The project was started with the idea to synthesize the cubic silsesquioxanes with organofunctionalized pendant chains, which are able to capture heavy metals, dyes and some acids like CO 2 . But in the beginning the hurdles like low % yields (30-37 %) and long reaction times (5-35 days) were to be faced. The reactions were worked out to enhance the % yields as well as to reduce the reaction time. Some modifications in reaction routes have been introduced, which brought up remarkable improvements in the results, where yield was increased upto 64 % and reaction time was reduced to 1 day. All the synthesized products were then characterized for their structure elucidations using different physical techniques like FTIR, CHN, TGA, 13 CNMR & 29 SiNMR in solid state, where Si-O cages of all compounds were elaborated through 29 Si-NMR in solid state as well as through their respective FTIR patterns, while the pendant chains anchored to the POSS cages were confirmed using 13 C-NMR results along with their respective FTIR spectra. The synthesized compounds were then tested for their thermal stability using the TGA technique. After optimizing the synthesis of cubic silsesquioxanes, hybrids PAA-13-3, PAA-MTC and PAA-Ph were worked out for their abilities of capturing divalent cations like Cu 2+ , Cd 2+ and Pb 2+ from their aqueous solutions, where Cu 2+ showed higher affinity of sorption than other two bivalent metals. These sorption systems were analyzed using the ICP-OES. To explain the sorption behaviour of these samples some statistical models like Langmuir, Freundlich, Sips, Temkin and Redlich-Peterson were applied to the sorption data, where the data for Cu 2+ on to PAA-13-3 was best fitted by Langmuir adsorption isotherm model showing the sorption to be monolayer, while in case of PAA-MTC and PAA-Ph Freundlich model was found to be a best fit, confirming multilayer sorption. One of the synthesized materials (PAA-13-3) was also evaluated for its ability to adsorb gaseous CO 2 and was proved to be promising in removing CO 2 , even at low pressures (max. 100 mmHg). The adsorption of CO 2 in the material is also studied by solid-gas adsorption calorimetry through a calorimeter especially developed for this system, where enthalpy of adsorption values were found to be between -7 and -36 kJ mol -1 . xiv xv Resumo:Este trabalho apresenta a síntese e caracterização de compostos silsesquioxanos gaiola cúbica (POSS) com cadeias orgânicas pendentes. O projeto foi iniciado com a idéia de sintetizar os silsesquioxanos cúbicos com cadeias organofuncionalizadas ancoradas, capazes de capturar os metais pesados, corantes e CO 2 . Mas foram enfrentadas algumas dificuldades como baixo rendimento (30-37%) e longo tempo de reação (5-35 dias). As reações foram investigadas para melhorar o rendimento, bem como para reduzir o tempo de reação. Algumas modificações em rotas de reação foram...

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“…was prepared according to the procedure described in the literature [19] with some modifications. The preparation of octa (3-aminopropyl)octasilsesquioxane used a two-step process.…”

Section: Preparation Of Octa(3-aminopropylmentioning

confidence: 99%

Determination of Copper in Different Ethanolic Matrices Using a Chloropropyl Silica Gel Modified with a Nanostructured Cubic Octa(3‐aminopropyl)octasilsesquioxane

Carmo

Bicalho

Silveira

et al. 2013

Journal of Chemistry

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The chloropropyl silica gel was modified with octa(3-aminopropyl)octasilsesquioxane and characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), spectroscopies, and surface and area porosity. The specific sorption capacity of metallic ions (Cu2+and Ni2+) increases in the following solvent order: water<ethanol 42%<ethanol<ketone. The high values of the constant (K) in the order of 103 L mol−1suggested the high adsorbent capacity of the modified silica (SGAPC) for Cu2+and Ni2+. SGAPC was applied to a separation column and shows recoveries of around 100% of copper in samples of sugar cane spirit, vodka, ginger brandy, and ethanol fuel.

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A novel nanostructured composite formed by interaction of copper octa(3-aminopropyl)octasilsesquioxane with azide ligands: Preparation, characterization and a voltammetric application

Cited by 23 publications

References 38 publications

Layered Hybrid Perovskites with Micropores Created by Alkylammonium Functional Silsesquioxane Interlayers

Layered Hybrid Perovskites with Micropores Created by Alkylammonium Functional Silsesquioxane Interlayers

Functionalized polyhedral oligomeric silsesquioxane (POSS) for incorporation of chemically pendant chains = Utilização de silsesquioxanos oligoméricos poliédricos funcionalizados (POSS) no ancoramento de cadeias orgânicas à superfície

Determination of Copper in Different Ethanolic Matrices Using a Chloropropyl Silica Gel Modified with a Nanostructured Cubic Octa(3‐aminopropyl)octasilsesquioxane

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