Synthesis, structure and band gap energy of a series of thermostable alkaline earth metal based metal–organic frameworks

Rao, Purna Chandra; S, Asha K.; Mandal, Sukhendu

doi:10.1039/c4ce01505c

Cited by 19 publications

(12 citation statements)

References 43 publications

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“…The samples were compressed onto a KBr backed pellet for analysis. Spectra were treated using Kubelka-Munk function [38] in order to eliminate any tailing contribution from the DR-UV-vis spectra. The following equation was applied:…”

Section: Materials Characterisation Methodsmentioning

confidence: 99%

CO 2 capture and photocatalytic reduction using bifunctional TiO 2 /MOF nanocomposites under UV–vis irradiation

Crake

Christoforidis

Kafizas

et al. 2017

Applied Catalysis B: Environmental

319

170

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Section: Materials Characterisation Methodsmentioning

confidence: 99%

CO 2 capture and photocatalytic reduction using bifunctional TiO 2 /MOF nanocomposites under UV–vis irradiation

Crake

Christoforidis

Kafizas

et al. 2017

Applied Catalysis B: Environmental

319

170

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“…These Ba-O-Ba inorganic chains are furtherc onnected by the carboxylic acids to form a3 Ds tructure with an I 1 O 2 connectivity.F ormation of al ayeredM -O polyhedral structure for heavy metal ions is often common as reported in litertratures. [21,23] For Ba-2, three crystallographically independent barium ions are connectedb yt hree water molecules and two carboxylate oxygen atomsofHBPTC 3À ligands to constructa0D [Ba3O20] inorganic cluster,i nw hich coordinated numberso fb arium ions are 9, 7, 9, respectively.F urthermore, partlyd eprotonated H 4 BPTC ligands further connect these polyhedra, and the final structure can be classified as I 0 O 2 type. A1 DB a-O-Ba connectivity in [Ba 2 (BTPC)(H 2 O) 2 ] n [26] has been previously prepared using the same startingm aterials at the higher reaction temperature (140 8C).…”

Section: Resultsmentioning

confidence: 99%

“…[20][21][22] On the other hand, their low density and toxicity,a nd high stability to water and air,a sw ell as relatively low cost, attract many researchers to explore their potentiala pplicationsa sf unctional materials. [21,[23][24][25] It is worth investigating the step-by-steps tructural transformationo ff inal crystal compounds containing alkaline earth metal ions to meet the need of their controllable synthesis.…”

Section: Introductionmentioning

confidence: 99%

Structural Transformation Pathways of Alkaline Earth Family Coordination Polymers Containing 3,3′,5,5′‐Biphenyl Tetracarboxylic Acid

Zhang

Tong

et al. 2019

Chemistry An Asian Journal

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The understanding of crystal stepwise transformation is very important to enclose the "black box" in the preparation of crystal materials. In this work, different structural intermediates were isolated prior to the formation of the final alkali earth coordination polymers (CPs) during the preparation of three pairs of alkali earth CPs through solvothermal methoda nd convenient oil-bath reactions. Single crystal X-ray diffraction analysisd emonstrated the structural transformation from a0Dt o1D inorganic connectivity for the Ca-CPs and Sr-CPs, buta1Dto 0Dinorganic connectivity for Ba-CPs, involving the breakage/formation of chemical bonds in the reaction solutions. Furthera nalyses indicated that these two different structural transformation pathways are determined by the deprotonation of organic acid, competitiveb alance between the inorganic and organic connectivity,a nd the twist of the linker.F T-IR spectra, thermogravimetric and luminescence behaviors agree with their structural characteristics.

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“…Spectral band width was set to 2 nm, with Spectralon as a standard. Spectra were treated using Kubelka–Munk function to eliminate any tailing contribution from the DR‐UV–vis spectra. The following equation was applied

F (R) = \frac{{(1 - R)}^{2}}{2 R}

where R is the reflectance.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

Crake

Christoforidis

Gregg

et al. 2019

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researchers need to identify efficient routes toward solar fuels production. Solar fuels refer to fuels produced by action of sunlight, particularly H 2 produced from water and C 1 or C 1+ energized molecules (i.e., CO, CH 4 , CH 3 OH) produced from CO 2 . [1] The latter reaction, i.e., CO 2 photo reduction, is the focus of this study. Photo catalysis represents one route toward CO 2 photo reduction. In that case, the design and manufacturing of a costeffective, sustainable, efficient, and robust photo catalyst is of paramount importance and remains a highly challenging task com bining aspects of materials science, photo chemistry, and reactor design engineering.The most widely researched photocata lysts for CO 2 reduction are semiconduc tors. Of which, TiO 2 has inspired intense research since the first demonstration in 1972, [2] owing to its high stability, low cost, and nontoxic nature. These studies have shown that the TiO 2 morphology (e.g., 1D structures), crystalline form (e.g., anatase, rutile, brookite, and titanate), and com position (e.g., heterojunction, heterostuc ture formation) all are critical factors for improved photocatalytic activity. [3] Another example of semicon ductor, considered as a derivative of titania, is titanate. Titanate materials are photocatalytically active, with a crystalline struc ture similar to anatase TiO 2 and a 1D morpho logy. Compared to conventional TiO 2 , they exhibit attractive properties for photoca talysis such as a high surface area, a welldefined morphology, an improved photogenerated charge separation, and a small bandgap. [4] Titanates have been used for photocatalysis, [5] and in particular, we note two studies on CO 2 photoreduction. [6] Recent photocatalytic improvements routes using titanate-not limited to CO 2 photoreduction-include the formation of composite mate rials for improved charge separation [4b,5d,7] and the conversion to a mixed phase anatase/titanate material hydrothermally, while retaining the fiber morphology. [8] Specifically, mixed phase TiO 2 can enhance charge separation and catalytic activity. [9] Despite these improvements, the photocatalytic activity of TiO 2 remains below acceptable levels for large scale deployment due to its large bandgap, rapid photogenerated charge recombination, and low CO 2 adsorption capacity. [10] Metal-organic frameworks (MOFs) have also recently been explored as photocatalysts for CO 2 reduction, with their CO 2 photoreduction to C 1 /C 1+ energized molecules is a key reaction of solar fuel technologies. Building heterojunctions can enhance photocatalysts performance, by facilitating charge transfer between two heterojunction phases. The material parameters that control this charge transfer remain unclear. Here, it is hypothesized that governing factors for CO 2 photoreduction in gas phase are: i) a large porosity to accumulate CO 2 molecules close to catalytic sites and ii) a high number of "points of contact" between the heterojunction components to enhance charge transfer. The former requirement ca...

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Synthesis, structure and band gap energy of a series of thermostable alkaline earth metal based metal–organic frameworks

Cited by 19 publications

References 43 publications

CO 2 capture and photocatalytic reduction using bifunctional TiO 2 /MOF nanocomposites under UV–vis irradiation

CO 2 capture and photocatalytic reduction using bifunctional TiO 2 /MOF nanocomposites under UV–vis irradiation

Structural Transformation Pathways of Alkaline Earth Family Coordination Polymers Containing 3,3′,5,5′‐Biphenyl Tetracarboxylic Acid

The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

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Synthesis, structure and band gap energy of a series of thermostable alkaline earth metal based metal–organic frameworks

Cited by 19 publications

References 43 publications

CO 2 capture and photocatalytic reduction using bifunctional TiO 2 /MOF nanocomposites under UV–vis irradiation

CO 2 capture and photocatalytic reduction using bifunctional TiO 2 /MOF nanocomposites under UV–vis irradiation

Structural Transformation Pathways of Alkaline Earth Family Coordination Polymers Containing 3,3′,5,5′‐Biphenyl Tetracarboxylic Acid

The Effect of Materials Architecture in TiO2/MOF Composites on CO2 Photoreduction and Charge Transfer

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The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer