A Bismuth Metal–Organic Framework as a Contrast Agent for X-ray Computed Tomography

Abstract New composite materials containing metal-organic framework (MOF-5) particles were manufactured by 3D printing. The optimal composition of the photopolymer formulation and printing conditions ensuring the highest quality of printing were selected. Retention of the metal-organic framework (MOF) structure in the resulting composite objects was demonstrated by powder X-ray diffraction. The distribution of MOF-5 particles over the whole bulk of the 3D product was studied by X-ray computed tomography. In the future, composite materials of this type containing catalytically active MOFs, with their structure and properties being controllable at the micro and macro levels, could find application as catalysts of various chemical processes.

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Synthesis and Structure of a Clathrated Two-Dimensional Metal-Organic Framework: [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2·H2O (L = Bis(1-pyrazinylethylidene)hydrazine)

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20080024 ◽

2008 ◽

Vol 73 (1) ◽

pp. 24-31

Author(s):

Dayu Wu ◽

Genhua Wu ◽

Wei Huang ◽

Zhuqing Wang

Keyword(s):

Metal Organic Framework ◽

Channel Structure ◽

Two Dimensional ◽

X Ray Diffraction ◽

Guest Molecules ◽

X Ray ◽

Square Planar ◽

Metal Organic ◽

Aqueous Meoh ◽

Organic Framework

The compound [Cd(4,4'-bpy)2(H2O)2](ClO4)2·(L)2 was obtained by the reaction of Cd(ClO4)2, bis(1-pyrazinylethylidene)hydrazine (L) and 4,4'-bipyridine in aqueous MeOH. Single-crystal X-ray diffraction has revealed its two-dimensional metal-organic framework. The 2-D layers superpose on each other, giving a channel structure. The square planar grids consist of two pairs of shared edges with Cd(II) ion and a 4,4'-bipyridine molecule each vertex and side, respectively. The square cavity has a dimension of 11.817 × 11.781 Å. Two guest molecules of bis(1-pyrazinylethylidene)hydrazine are clathrated in every hydrophobic host cavity, being further stabilized by π-π stacking and hydrogen bonding. The results suggest that the hydrazine molecules present in the network serve as structure-directing templates in the formation of crystal structures.

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Backbonding contributions to small molecule chemisorption in a metal–organic framework with open copper(i) centers

Chemical Science ◽

10.1039/d0sc06038k ◽

2021 ◽

Author(s):

Gregory M. Su ◽

Han Wang ◽

Brandon R. Barnett ◽

Jeffrey R. Long ◽

David Prendergast ◽

...

Keyword(s):

Fine Structure ◽

Small Molecule ◽

Metal Organic Framework ◽

X Ray ◽

Metal Site ◽

Absorption Fine ◽

Metal Organic ◽

X Ray Absorption ◽

Organic Framework

In situ near edge X-ray absorption fine structure spectroscopy directly probes unoccupied states associated with backbonding interactions between the open metal site in a metal–organic framework and various small molecule guests.

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Large anisotropic negative thermal expansion in Cu-TDPAT metal-organic framework: A combined in situ X-ray diffraction and DRIFTS study

Nano Research ◽

10.1007/s12274-020-2792-y ◽

2020 ◽

Vol 14 (2) ◽

pp. 404-410 ◽

Cited By ~ 2

Author(s):

Mehrdad Asgari ◽

Ilia Kochetygov ◽

Hassan Abedini ◽

Wendy L. Queen

Keyword(s):

Thermal Expansion ◽

Metal Organic Framework ◽

Negative Thermal Expansion ◽

X Ray Diffraction ◽

X Ray ◽

Metal Organic ◽

Organic Framework

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Single Crystal X-ray Diffraction Studies of Carbon Dioxide and Fuel-Related Gases Adsorbed on the Small Pore Scandium Terephthalate Metal Organic Framework, Sc2(O2CC6H4CO2)3

Langmuir ◽

10.1021/la803788u ◽

2009 ◽

Vol 25 (6) ◽

pp. 3618-3626 ◽

Cited By ~ 74

Author(s):

Stuart R. Miller ◽

Paul A. Wright ◽

Thomas Devic ◽

Christian Serre ◽

Gérard Férey ◽

...

Keyword(s):

Carbon Dioxide ◽

Single Crystal ◽

Metal Organic Framework ◽

X Ray Diffraction ◽

X Ray ◽

Small Pore ◽

Metal Organic ◽

Organic Framework

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Highly Efficient Adsorption of Aqueous Pb(II) with Mesoporous Metal-Organic Framework-5: An Equilibrium and Kinetic Study

Journal of Nanomaterials ◽

10.1155/2016/8095737 ◽

2016 ◽

Vol 2016 ◽

pp. 1-9 ◽

Cited By ~ 21

Author(s):

José María Rivera ◽

Susana Rincón ◽

Cherif Ben Youssef ◽

Alejandro Zepeda

Keyword(s):

Kinetic Study ◽

Photoelectron Spectroscopy ◽

Metal Organic Framework ◽

Isotherm Models ◽

Ionic Exchange ◽

Order Kinetic ◽

X Ray ◽

Metal Organic ◽

Mesoporous Metal ◽

Organic Framework

Mesoporous metal-organic framework-5 (MOF-5), with the composition Zn4O(BDC)3, showed a high capacity for the adsorptive removal of Pb(II) from 100% aqueous media. After the adsorption process, changes in both morphology and composition were detected using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) system, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) analysis. The experimental evidence showed that Zn(II) liberation from MOF-5 structure was provoked by the water effect demonstrating that Pb(II) removal is not due to ionic exchange with Zn. A kinetic study showed that Pb(II) removal was carried out in 30 min with a behavior of pseudo-second-order kinetic model. The experimental data on Pb(II) adsorption were adequately fit by both the Langmuir and BET isotherm models with maximum adsorption capacities of 658.5 and 412.7 mg/g, respectively, at pH 5 and 45°C. The results of this work demonstrate that the use of MOF-5 has great potential for applications in environmental protection, especially regarding the removal of the lead present in industrial wastewaters and tap waters.

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