scholarly journals Uncovering a reconstructive solid–solid phase transition in a metal–organic framework

2017 ◽  
Vol 4 (11) ◽  
pp. 171355 ◽  
Author(s):  
L. Longley ◽  
N. Li ◽  
F. Wei ◽  
T. D. Bennett
Keyword(s):  
Density Functional ◽  
Solid Phase ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Scanning Calorimetry ◽  
Young’S Moduli ◽  
Metal Organic ◽  
Organic Framework

A nanoporous three-dimensional metal–organic framework (MOF), ZnPurBr undergoes a transition to a previously unreported high-temperature phase, ZnPurBr-ht. The transition, which proceeds without mass loss, is uncovered through the use of differential scanning calorimetry (DSC). The new crystal structure was solved using single-crystal X-ray diffraction, and the mechanical properties of both phases investigated by nanoindentation and density functional theory. The anisotropy of the calculated Young's moduli showed good agreement with the crystallographic alignment of the stiff purinate organic linker. The results provide a prototypical example of the importance of the use of DSC in the MOF field, where its use is not currently standard in characterization.

Self-Diffusion and Reorientation of Methylammonium Ions in (CH3NH3)2ZnCl4 Crystals as Studied by 1H-NMR

1989 ◽  
Vol 44 (8) ◽  
pp. 741-746 ◽  
Author(s):  
Hiroyuki Ishida ◽  
Tadashi Iwachido ◽  
Naomi Hayama ◽  
Ryuichi Ikeda ◽  
Mifune Terashima ◽  
...  
Keyword(s):  
Solid Phase ◽  
Relaxation Times ◽  
Three Dimensional ◽  
Lattice Relaxation ◽  
High Temperature Phase ◽  
Spin Lattice Relaxation ◽  
Temperature Phase ◽  
Scanning Calorimetry ◽  
Self Diffusion ◽  
H Nmr

Abstract Differential thermal analysis, differential scanning calorimetry, and measurements of the 1H spin-lattice relaxation times and second moments of 1H-NMR absorptions were performed on methylammonium tetrachlorozincate (II) crystals over a wide temperature range. A solid-solid phase transition was located at 477 K. From the 1H-NMR experiments it was found that the cations undergo overall reorientation as well as three dimensional translational self-diffusion in the high-temperature phase. In the low-temperature phase, a 120° reorientational motion of the CH3 and NH3+ groups of the cation about its C-N bond axis was detected. The parameters for the motional modes of the cations in the crystal were evaluated from the analysis of the 1H-NMR experimental results.

scholarly journals Selective capture of carbon dioxide from hydrocarbons using a metal-organic framework

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Omid T. Qazvini ◽  
Ravichandar Babarao ◽  
Shane G. Telfer
Keyword(s):  
Carbon Dioxide ◽  
Density Functional ◽  
Metal Organic Framework ◽  
Density Functional Theory Calculations ◽  
Time Lags ◽  
X Ray Crystallography ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
Short Time ◽  
Organic Framework

AbstractEfficient and sustainable methods for carbon dioxide capture are highly sought after. Mature technologies involve chemical reactions that absorb CO2, but they have many drawbacks. Energy-efficient alternatives may be realised by porous physisorbents with void spaces that are complementary in size and electrostatic potential to molecular CO2. Here, we present a robust, recyclable and inexpensive adsorbent termed MUF-16. This metal-organic framework captures CO2 with a high affinity in its one-dimensional channels, as determined by adsorption isotherms, X-ray crystallography and density-functional theory calculations. Its low affinity for other competing gases delivers high selectivity for the adsorption of CO2 over methane, acetylene, ethylene, ethane, propylene and propane. For equimolar mixtures of CO2/CH4 and CO2/C2H2, the selectivity is 6690 and 510, respectively. Breakthrough gas separations under dynamic conditions benefit from short time lags in the elution of the weakly-adsorbed component to deliver high-purity hydrocarbon products, including pure methane and acetylene.

Three-dimensional hierarchical C-Co-N/Se derived from metal-organic framework as superior cathode for Li-Se batteries

2017 ◽  
Vol 363 ◽  
pp. 103-109 ◽  
Author(s):  
Jiarui He ◽  
Weiqiang Lv ◽  
Yuanfu Chen ◽  
Jie Xiong ◽  
Kechun Wen ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Three Dimensional ◽  
Metal Organic ◽  
Organic Framework

Application of a Zn(ii) based metal–organic framework as an efficient solid-phase extraction sorbent for preconcentration of plasticizer compounds

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40211-40218 ◽  
Author(s):  
Elham Tahmasebi ◽  
Mohammad Yaser Masoomi ◽  
Yadollah Yamini ◽  
Ali Morsali
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Phase Extraction ◽  
Metal Organic ◽  
Organic Framework

A solid-phase extraction (SPE) sorbent, a Zn(ii) based metal–organic framework, was prepared via a simple, solventless, green and a low-cost mechanosynthesis process.

Electron transitions in a Ce(iii)-catecholate metal–organic framework

2022 ◽  
Author(s):  
Julia G. Knapp ◽  
Debmalya Ray ◽  
Paul B. Calio ◽  
Megan C. Wasson ◽  
Thais R. Scott ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Three Dimensional ◽  
Electron Transitions ◽  
Metal Organic ◽  
Organic Framework

Competitive electron transitions are present in a rare three-dimensional Ce(iii)-catecholate metal–organic framework.

Li-based MOF-derived multifunctional PEO polymer solid-state electrolyte for lithium energy storage

2022 ◽  
Author(s):  
Xiang Han ◽  
Tiantian Wu ◽  
Lanhui Gu ◽  
Dian Tian
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Isophthalic Acid ◽  
Solid State Electrolyte ◽  
Metal Organic ◽  
Solvothermal Conditions ◽  
Organic Framework

A three-dimensional (3D) metal-organic framework containing Li-oxygen clusters, namely {[Li2(IPA)]·DMF}n (1) (H2IPA = isophthalic acid), has been constructed under solvothermal conditions. The Li-based MOF can be applied to lithium energy...

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