5 research outputs found
Soft Hydrogen-Bonded Organic Frameworks Constructed Using a Flexible Organic Cage Hinge.
Soft porous crystals combine flexibility and porosity, allowing them to respond structurally to external physical and chemical environments. However, striking the right balance between flexibility and sufficient rigidity for porosity is challenging, particularly for molecular crystals formed by using weak intermolecular interactions. Here, we report a flexible oxygen-bridged prismatic organic cage molecule, Cage-6-COOH, which has three pillars that exhibit "hinge-like" rotational motion in the solid state. Cage-6-COOH can form a range of hydrogen-bonded organic frameworks (HOFs) where the "hinge" can accommodate a remarkable 67Ā° dihedral angle range between neighboring units. This stems both from flexibility in the noncovalent hydrogen-bonding motifs in the HOFs and the molecular flexibility in the oxygen-linked cage hinge itself. The range of structures for Cage-6-COOH includes two topologically complex interpenetrated HOFs, CageHOF-2Ī± and CageHOF-2Ī². CageHOF-2Ī± is nonporous, while CageHOF-2Ī² has permanent porosity and a surface area of 458 m2 g-1. The flexibility of Cage-6-COOH allows this molecule to rapidly transform from a low-crystallinity solid into the two crystalline interpenetrated HOFs, CageHOF-2Ī± and CageHOF-2Ī², under mild conditions simply by using acetonitrile or ethanol vapor, respectively. This self-healing behavior was selective, with the CageHOF-2Ī² structure exhibiting structural memory behavior
Soft Hydrogen-Bonded Organic Frameworks Constructed Using a Flexible Organic Cage Hinge
Soft
porous crystals combine flexibility and porosity, allowing
them to respond structurally to external physical and chemical environments.
However, striking the right balance between flexibility and sufficient
rigidity for porosity is challenging, particularly for molecular crystals
formed by using weak intermolecular interactions. Here, we report
a flexible oxygen-bridged prismatic organic cage molecule, Cage-6-COOH, which has three pillars that exhibit āhinge-likeā
rotational motion in the solid state. Cage-6-COOH can
form a range of hydrogen-bonded organic frameworks (HOFs) where the
āhingeā can accommodate a remarkable 67Ā° dihedral
angle range between neighboring units. This stems both from flexibility
in the noncovalent hydrogen-bonding motifs in the HOFs and the molecular
flexibility in the oxygen-linked cage hinge itself. The range of structures
for Cage-6-COOH includes two topologically complex interpenetrated
HOFs, CageHOF-2Ī± and CageHOF-2Ī². CageHOF-2Ī± is nonporous, while CageHOF-2Ī² has permanent porosity and a surface area of 458 m2 gā1. The flexibility of Cage-6-COOH allows
this molecule to rapidly transform from a low-crystallinity solid
into the two crystalline interpenetrated HOFs, CageHOF-2Ī± and CageHOF-2Ī², under mild conditions simply
by using acetonitrile or ethanol vapor, respectively. This self-healing
behavior was selective, with the CageHOF-2Ī² structure
exhibiting structural memory behavior
Soft Hydrogen-Bonded Organic Frameworks Constructed Using a Flexible Organic Cage Hinge
Soft
porous crystals combine flexibility and porosity, allowing
them to respond structurally to external physical and chemical environments.
However, striking the right balance between flexibility and sufficient
rigidity for porosity is challenging, particularly for molecular crystals
formed by using weak intermolecular interactions. Here, we report
a flexible oxygen-bridged prismatic organic cage molecule, Cage-6-COOH, which has three pillars that exhibit āhinge-likeā
rotational motion in the solid state. Cage-6-COOH can
form a range of hydrogen-bonded organic frameworks (HOFs) where the
āhingeā can accommodate a remarkable 67Ā° dihedral
angle range between neighboring units. This stems both from flexibility
in the noncovalent hydrogen-bonding motifs in the HOFs and the molecular
flexibility in the oxygen-linked cage hinge itself. The range of structures
for Cage-6-COOH includes two topologically complex interpenetrated
HOFs, CageHOF-2Ī± and CageHOF-2Ī². CageHOF-2Ī± is nonporous, while CageHOF-2Ī² has permanent porosity and a surface area of 458 m2 gā1. The flexibility of Cage-6-COOH allows
this molecule to rapidly transform from a low-crystallinity solid
into the two crystalline interpenetrated HOFs, CageHOF-2Ī± and CageHOF-2Ī², under mild conditions simply
by using acetonitrile or ethanol vapor, respectively. This self-healing
behavior was selective, with the CageHOF-2Ī² structure
exhibiting structural memory behavior
Soft Hydrogen-Bonded Organic Frameworks Constructed Using a Flexible Organic Cage Hinge
Soft
porous crystals combine flexibility and porosity, allowing
them to respond structurally to external physical and chemical environments.
However, striking the right balance between flexibility and sufficient
rigidity for porosity is challenging, particularly for molecular crystals
formed by using weak intermolecular interactions. Here, we report
a flexible oxygen-bridged prismatic organic cage molecule, Cage-6-COOH, which has three pillars that exhibit āhinge-likeā
rotational motion in the solid state. Cage-6-COOH can
form a range of hydrogen-bonded organic frameworks (HOFs) where the
āhingeā can accommodate a remarkable 67Ā° dihedral
angle range between neighboring units. This stems both from flexibility
in the noncovalent hydrogen-bonding motifs in the HOFs and the molecular
flexibility in the oxygen-linked cage hinge itself. The range of structures
for Cage-6-COOH includes two topologically complex interpenetrated
HOFs, CageHOF-2Ī± and CageHOF-2Ī². CageHOF-2Ī± is nonporous, while CageHOF-2Ī² has permanent porosity and a surface area of 458 m2 gā1. The flexibility of Cage-6-COOH allows
this molecule to rapidly transform from a low-crystallinity solid
into the two crystalline interpenetrated HOFs, CageHOF-2Ī± and CageHOF-2Ī², under mild conditions simply
by using acetonitrile or ethanol vapor, respectively. This self-healing
behavior was selective, with the CageHOF-2Ī² structure
exhibiting structural memory behavior