6 research outputs found
A Dual-Responsive Supra-Amphiphilic Polypseudorotaxane Constructed from a Water-Soluble Pillar[7]arene and an Azobenzene-Containing Random Copolymer
Macromolecular supra-amphiphiles
refer to a kind of macromolecular
amphiphiles whose hydrophlic and hydrophobic parts are connected by
noncovalent forces. They have applications in various fields, such
as drug delivery, sensor systems, and biomedical materials. Here we
report a novel molecular recognition motif between a new thermoresponsive
water-soluble pillar[7]arene (<b>WP7</b>) and an azobenzene
derivative. Furthermore, we utilized this recognition motif to construct
the first pillararene-based supra-amphiphilic polypseudorotaxane which
can self-assemble to form vesicles in water. Due to the dual-responsiveness
of the molecular recognition motif (the thermoresponsiveness of <b>WP7</b> and photoresponsiveness of azobenzene), the reversible
transformations between solid nanospheres based on the self-assembly
of the polymer backbone and vesicles based on the self-assembly of
the supra-amphiphilic polypseudorotaxane were achieved by adjusting
the solution temperature or UV–visible light irradiation. These
dual-responsive aggregation behaviors were further used in the controlled
release of water-soluble dye calcein molecules
Dual-Responsive [2]Pseudorotaxane On the basis of a pH-Sensitive Pillar[5]arene and Its Application in the Fabrication of Metallosupramolecular Polypseudorotaxane
Metallosupramolecular
polymer, an appealing polymeric material,
plays important roles in many fields including catalysis, electrochemical
devices, conducting materials and so on. As a class of metallosupramolecular
polymers, metallosupramolecular polypseudorotaxane has attracted great
attention not only because of its wide applications but also due to
its facile synthesis which is by metal coordination between metal
and macrocycle-based pseudorotaxane. The introducing of stimuli-responsive
property into the metallosupramolecular polypseudorotaxane system
will enrich their functionality. Herein, a triple stimuli-responsive
metallosupramolecular polypseudorotaxane constructed by pillararene-based
host–guest interaction and copper coordination. First, a new
pH-sensitive pillar[5]arene host (<b>H</b>) was synthesized.
An azastilbenzene derivative, <i>trans</i>- 4,4′-vinylenedipyridine
(<i><b>trans</b></i>-<b>G</b>) was chosen as
the guest molecule to construct a [2]pseudorotaxane based on <b>H</b> and <i><b>trans</b></i>-<b>G</b>.
The [2]pseudorotaxane displayed pH- and photo- dual stimuli-responsiveness.
Then the [2]pseudorotaxane was used to construct a pH-, photo- and
cyanide-triple stimuli-responsive metallosupramolecular polypseudorotaxane
based on Cu(II) ion coordination
Dual-Responsive [2]Pseudorotaxane On the basis of a pH-Sensitive Pillar[5]arene and Its Application in the Fabrication of Metallosupramolecular Polypseudorotaxane
Metallosupramolecular
polymer, an appealing polymeric material,
plays important roles in many fields including catalysis, electrochemical
devices, conducting materials and so on. As a class of metallosupramolecular
polymers, metallosupramolecular polypseudorotaxane has attracted great
attention not only because of its wide applications but also due to
its facile synthesis which is by metal coordination between metal
and macrocycle-based pseudorotaxane. The introducing of stimuli-responsive
property into the metallosupramolecular polypseudorotaxane system
will enrich their functionality. Herein, a triple stimuli-responsive
metallosupramolecular polypseudorotaxane constructed by pillararene-based
host–guest interaction and copper coordination. First, a new
pH-sensitive pillar[5]arene host (<b>H</b>) was synthesized.
An azastilbenzene derivative, <i>trans</i>- 4,4′-vinylenedipyridine
(<i><b>trans</b></i>-<b>G</b>) was chosen as
the guest molecule to construct a [2]pseudorotaxane based on <b>H</b> and <i><b>trans</b></i>-<b>G</b>.
The [2]pseudorotaxane displayed pH- and photo- dual stimuli-responsiveness.
Then the [2]pseudorotaxane was used to construct a pH-, photo- and
cyanide-triple stimuli-responsive metallosupramolecular polypseudorotaxane
based on Cu(II) ion coordination
Dual-Responsive [2]Pseudorotaxane On the basis of a pH-Sensitive Pillar[5]arene and Its Application in the Fabrication of Metallosupramolecular Polypseudorotaxane
Metallosupramolecular
polymer, an appealing polymeric material,
plays important roles in many fields including catalysis, electrochemical
devices, conducting materials and so on. As a class of metallosupramolecular
polymers, metallosupramolecular polypseudorotaxane has attracted great
attention not only because of its wide applications but also due to
its facile synthesis which is by metal coordination between metal
and macrocycle-based pseudorotaxane. The introducing of stimuli-responsive
property into the metallosupramolecular polypseudorotaxane system
will enrich their functionality. Herein, a triple stimuli-responsive
metallosupramolecular polypseudorotaxane constructed by pillararene-based
host–guest interaction and copper coordination. First, a new
pH-sensitive pillar[5]arene host (<b>H</b>) was synthesized.
An azastilbenzene derivative, <i>trans</i>- 4,4′-vinylenedipyridine
(<i><b>trans</b></i>-<b>G</b>) was chosen as
the guest molecule to construct a [2]pseudorotaxane based on <b>H</b> and <i><b>trans</b></i>-<b>G</b>.
The [2]pseudorotaxane displayed pH- and photo- dual stimuli-responsiveness.
Then the [2]pseudorotaxane was used to construct a pH-, photo- and
cyanide-triple stimuli-responsive metallosupramolecular polypseudorotaxane
based on Cu(II) ion coordination
Cyclo[4]carbazole, an Iodide Anion Macrocyclic Receptor
A novel preorganized
and rigid iodide anion macrocyclic receptor,
cyclo[4]carbazole (<b>Cy[4]C</b>), is reported here. The structure
of <b>Cy[4]C</b> was confirmed by single-crystal X-ray analysis.
The binding affinity of <b>Cy[4]C</b> for iodide anion was investigated
by UV–vis and <sup>1</sup>H NMR spectroscopic techniques. The
crystal structure of the complex between <b>Cy[4]C</b> and chloroform
also provided evidence for the recognition ability of <b>Cy[4]C</b> toward iodide anion. Furthermore, the 1:1 complexation stoichiometry
between <b>Cy[4]C</b> and iodide anion was confirmed by high-resolution
mass spectrometry and molecular modeling
Cyclo[4]carbazole, an Iodide Anion Macrocyclic Receptor
A novel preorganized
and rigid iodide anion macrocyclic receptor,
cyclo[4]carbazole (<b>Cy[4]C</b>), is reported here. The structure
of <b>Cy[4]C</b> was confirmed by single-crystal X-ray analysis.
The binding affinity of <b>Cy[4]C</b> for iodide anion was investigated
by UV–vis and <sup>1</sup>H NMR spectroscopic techniques. The
crystal structure of the complex between <b>Cy[4]C</b> and chloroform
also provided evidence for the recognition ability of <b>Cy[4]C</b> toward iodide anion. Furthermore, the 1:1 complexation stoichiometry
between <b>Cy[4]C</b> and iodide anion was confirmed by high-resolution
mass spectrometry and molecular modeling