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Physical Properties of Ethers

Physical Properties of Ethers

Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...

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Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

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Water-Stable etb-MOFs for Methane and Carbon Dioxide Storage.

Constantinos Tsangarakis¹, Ali Azmy², Christos Tampaxis³

¹Department of Chemistry, University of Crete, Heraklion 71003, Greece.

Inorganic Chemistry

|March 28, 2023

Summary

New metal-organic frameworks (MOFs) with amide groups show high methane and carbon dioxide uptake. These materials demonstrate excellent gas storage capacities, comparable to established porous materials.

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Area of Science:

Materials Science
Chemistry
Chemical Engineering

Background:

Metal-organic frameworks (MOFs) are crystalline porous materials with tunable structures.
Developing MOFs with high gas storage capacities is crucial for energy applications.
Amide functionalization can influence the adsorption properties of MOFs.

Purpose of the Study:

To synthesize and characterize new water-stable MOFs using the etb platform.
To evaluate the methane (CH4) and carbon dioxide (CO2) storage capacities of the synthesized MOFs.
To investigate the adsorption mechanism of CH4 in the MOFs.

Main Methods:

Synthesis of two new MOFs, Al(L1) and Al(L2), using amide-functionalized organic linkers and Al3+ ions.
Gas adsorption measurements for CH4 and CO2 at various pressures and ambient temperature.
Theoretical calculations to understand the CH4 adsorption mechanism.

Main Results:

The mesoporous Al(L1) MOF exhibited high CH4 uptake (192 cm3 (STP) cm-3, 0.254 g g-1 at 100 bar and 298 K).
Al(L1) demonstrated significant CO2 adsorption (50 wt%, 304 cm3 (STP) cm-3 at 50 bar and 298 K).
Theoretical calculations revealed strong CH4 adsorption sites near amide groups.

Conclusions:

Amide-functionalized mesoporous etb-MOFs show excellent CH4 and CO2 storage capacities.
These MOFs offer a promising platform for designing materials for gas storage applications.
The performance of these MOFs is comparable to high-surface-area microporous MOFs.