16 research outputs found
A Chemically Cross-Linked NbO-Type Metal–Organic Framework: Cage or Window Partition?
By
using a presynthetically cross-linked octacarboxylate ligand, a chemically
cross-linked version of the NbO-type metal–organic framework
(MOF) <b>NOTT-101</b> (<b>ZJNU-80</b>) was prepared. Single-crystal
X-ray structure analysis showed that <b>ZJNU-80</b> adopts the
same topology as the parent compound <b>NOTT-101</b>, and the
tethering groups take part in the window partition, not the cage partition.
The gas adsorption studies showed that, despite the lower porosity, <b>ZJNU-80a</b> exhibits low-pressure gas adsorption behavior similar
to that of the parent MOF <b>NOTT-101a</b> toward CO<sub>2</sub>, CH<sub>4</sub>, and N<sub>2</sub> at ambient temperature because
of the fact that the window partition as a result of chemical cross-linking
does not almost alter the pore-size distributions. However, different
adsorption behaviors toward 1-butene, a molecule with even larger
kinetic diameter than that of the aforementioned adsorbates, were
observed because the window partition alters the efficiency with which
1-butene molecules pack within <b>ZJNU-80a</b> and <b>NOTT-101a</b> at conditions close to saturation. This work provides a fundamental
understanding on the effect of chemical cross-linking on the MOF’s
structure and gas adsorption properties
Exploring the Effect of Ligand-Originated MOF Isomerism and Methoxy Group Functionalization on Selective Acetylene/Methane and Carbon Dioxide/Methane Adsorption Properties in Two NbO-Type MOFs
Investigation of
the impact of ligand-originated MOF (metal–organic framework)
isomerism and ligand functionalization on gas adsorption is of vital
importance because a study in this aspect provides valuable guidance
for future fabrication of new MOFs exhibiting better performance.
For the abovementioned purpose, two NbO-type ligand-originated MOF
isomers based on methoxy-functionalized diisophthalate ligands were
solvothermally constructed in this work. Their gas adsorption properties
toward acetylene, carbon dioxide, and methane were systematically
investigated, revealing their promising potential for the adsorptive
separation of both acetylene/methane and carbon dioxide/methane gas
mixtures, which are involved in the industrial processes of acetylene
production and natural gas sweetening. In particular, compared to
its isomer <b>ZJNU-58</b>, <b>ZJNU-59</b> displays larger
acetylene and carbon dioxide uptake capacities as well as higher acetylene/methane
and carbon dioxide/methane adsorption selectivities despite its lower
pore volume and surface area, demonstrating a very crucial role that
the effect of pore size plays in acetylene and carbon dioxide adsorption.
In addition, the impact of ligand modification with a methoxy group
on gas adsorption was also evaluated. <b>ZJNU-58</b> exhibits
slightly lower acetylene and carbon dioxide uptake capacities but
higher acetylene/methane and carbon dioxide/methane adsorption selectivities
as compared to its parent compound NOTT-103. By contrast, enhanced
adsorption selectivities and uptake capacities were observed for <b>ZJNU-59</b> as compared to its parent compound <b>ZJNU-73</b>. The results demonstrated that the impact of ligand functionalization
with a methoxy group on gas adsorption might vary from MOF to MOF,
depending on the chosen parent compound. The results might shed some
light on understanding the impact of both ligand-originated MOF isomerism
and methoxy group functionalization on gas adsorption
Exploring the Effect of Ligand-Originated MOF Isomerism and Methoxy Group Functionalization on Selective Acetylene/Methane and Carbon Dioxide/Methane Adsorption Properties in Two NbO-Type MOFs
Investigation of
the impact of ligand-originated MOF (metal–organic framework)
isomerism and ligand functionalization on gas adsorption is of vital
importance because a study in this aspect provides valuable guidance
for future fabrication of new MOFs exhibiting better performance.
For the abovementioned purpose, two NbO-type ligand-originated MOF
isomers based on methoxy-functionalized diisophthalate ligands were
solvothermally constructed in this work. Their gas adsorption properties
toward acetylene, carbon dioxide, and methane were systematically
investigated, revealing their promising potential for the adsorptive
separation of both acetylene/methane and carbon dioxide/methane gas
mixtures, which are involved in the industrial processes of acetylene
production and natural gas sweetening. In particular, compared to
its isomer <b>ZJNU-58</b>, <b>ZJNU-59</b> displays larger
acetylene and carbon dioxide uptake capacities as well as higher acetylene/methane
and carbon dioxide/methane adsorption selectivities despite its lower
pore volume and surface area, demonstrating a very crucial role that
the effect of pore size plays in acetylene and carbon dioxide adsorption.
In addition, the impact of ligand modification with a methoxy group
on gas adsorption was also evaluated. <b>ZJNU-58</b> exhibits
slightly lower acetylene and carbon dioxide uptake capacities but
higher acetylene/methane and carbon dioxide/methane adsorption selectivities
as compared to its parent compound NOTT-103. By contrast, enhanced
adsorption selectivities and uptake capacities were observed for <b>ZJNU-59</b> as compared to its parent compound <b>ZJNU-73</b>. The results demonstrated that the impact of ligand functionalization
with a methoxy group on gas adsorption might vary from MOF to MOF,
depending on the chosen parent compound. The results might shed some
light on understanding the impact of both ligand-originated MOF isomerism
and methoxy group functionalization on gas adsorption
Exploring the Effect of Ligand-Originated MOF Isomerism and Methoxy Group Functionalization on Selective Acetylene/Methane and Carbon Dioxide/Methane Adsorption Properties in Two NbO-Type MOFs
Investigation of
the impact of ligand-originated MOF (metal–organic framework)
isomerism and ligand functionalization on gas adsorption is of vital
importance because a study in this aspect provides valuable guidance
for future fabrication of new MOFs exhibiting better performance.
For the abovementioned purpose, two NbO-type ligand-originated MOF
isomers based on methoxy-functionalized diisophthalate ligands were
solvothermally constructed in this work. Their gas adsorption properties
toward acetylene, carbon dioxide, and methane were systematically
investigated, revealing their promising potential for the adsorptive
separation of both acetylene/methane and carbon dioxide/methane gas
mixtures, which are involved in the industrial processes of acetylene
production and natural gas sweetening. In particular, compared to
its isomer <b>ZJNU-58</b>, <b>ZJNU-59</b> displays larger
acetylene and carbon dioxide uptake capacities as well as higher acetylene/methane
and carbon dioxide/methane adsorption selectivities despite its lower
pore volume and surface area, demonstrating a very crucial role that
the effect of pore size plays in acetylene and carbon dioxide adsorption.
In addition, the impact of ligand modification with a methoxy group
on gas adsorption was also evaluated. <b>ZJNU-58</b> exhibits
slightly lower acetylene and carbon dioxide uptake capacities but
higher acetylene/methane and carbon dioxide/methane adsorption selectivities
as compared to its parent compound NOTT-103. By contrast, enhanced
adsorption selectivities and uptake capacities were observed for <b>ZJNU-59</b> as compared to its parent compound <b>ZJNU-73</b>. The results demonstrated that the impact of ligand functionalization
with a methoxy group on gas adsorption might vary from MOF to MOF,
depending on the chosen parent compound. The results might shed some
light on understanding the impact of both ligand-originated MOF isomerism
and methoxy group functionalization on gas adsorption
A Homochiral Microporous Hydrogen-Bonded Organic Framework for Highly Enantioselective Separation of Secondary Alcohols
A homochiral microporous hydrogen-bonded
organic framework (HOF-2)
based on a BINOL derivative has been synthesized and structurally
characterized to be a uninodal 6-connected {3<sup>3</sup>5<sup>5</sup>6<sup>6</sup>7} network. This new HOF exhibits not only a permanent
porosity with the BET of 237.6 m<sup>2</sup> g<sup>–1</sup> but also, more importantly, a highly enantioselective separation
of chiral secondary alcohols with ee value up to 92% for 1-phenylethanol
A Homochiral Microporous Hydrogen-Bonded Organic Framework for Highly Enantioselective Separation of Secondary Alcohols
A homochiral microporous hydrogen-bonded
organic framework (HOF-2)
based on a BINOL derivative has been synthesized and structurally
characterized to be a uninodal 6-connected {3<sup>3</sup>5<sup>5</sup>6<sup>6</sup>7} network. This new HOF exhibits not only a permanent
porosity with the BET of 237.6 m<sup>2</sup> g<sup>–1</sup> but also, more importantly, a highly enantioselective separation
of chiral secondary alcohols with ee value up to 92% for 1-phenylethanol