Self-Threading of a Poly(ethylene glycol) Chain in a Cyclodextrin-Ring:  Control of the Exchange Dynamics by Chain Length

Inoue, Youhei; Miyauchi, Masahiko; Nakajima, Hiroki; Takashima, Yoshinori; Yamaguchi, Hiroyasu; Harada, Akira

doi:10.1021/ja061095t

Cited by 48 publications

(32 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, a mixed self‐assembled monolayer (mSAM) strategy involving both L1 and a hydrophilic ligand L2 was employed to prepare water‐soluble hybrid AuNPs. L2 bears a polyethylene glycol moiety that has been proven to be unable to complex with the β‐CD ring 13. Upon optimization, an appropriate molar ratio ( L1 / L2 =1:7, see the Supporting Information, Figure S3) facilitated the formation of an mSAM on the AuNP surface.…”

Section: The Rate Of Hydrolysis Of Na and Bnpc As Catalyzed By Differmentioning

confidence: 99%

Photoswitchable Supramolecular Catalysis by Interparticle Host–Guest Competitive Binding

Zhu

Yan

Ang

et al. 2012

Chemistry A European J

View full text Add to dashboard Cite

On and off: ester hydrolysis catalyzed by a Zn(II) -coordinated β-cyclodextrin dimer can be switched on and off using light in the presence of gold nanoparticles with azobenzene units attached to their surfaces. Under visible light, the azobenzene units are trans and bind tightly to the dimer, thus leading to reduced catalysis. Under UV light, the azobenzene units are cis and bind loosely to the dimer, thus allowing substrates to bind and hydrolysis to occur.

show abstract

Section: The Rate Of Hydrolysis Of Na and Bnpc As Catalyzed By Differmentioning

confidence: 99%

Photoswitchable Supramolecular Catalysis by Interparticle Host–Guest Competitive Binding

Zhu

Yan

Ang

et al. 2012

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…To further probe the nature of these interactions, b-cyclodextrin was added to L-100/X-45 aqueous blends. As mentioned earlier, b-cyclodextrin and its derivatives have been shown to disrupt hydrophobic interactions in solution [38][39][40][41][42][43][44]. In our studies, b-cyclodextrin was added at 1.0 wt% concentration to a series of solutions having HEAT L-100 between 0.1 and 4.0 wt% concentration.…”

mentioning

confidence: 83%

Shear-thickening in aqueous surfactant-associative thickener mixtures

2011

View full text Add to dashboard Cite

Associative thickeners represent an important class of rheology modifiers used in waterborne coatings. Understanding molecular level interactions between associative thickeners and surfactants has been the subject of a number of prior studies. Our recent studies focused on the behavior of a hydrophobically modified, aminoplast ether (HEAT) associative thickener and a highly hydrophobic ethoxylated octylphenol surfactant in aqueous solution. Aqueous blends of these two materials exhibit shear-thinning, as well as rarely reported, transient, shear-induced thickening behavior. In addition, the same compositions exhibit both thixotropy and antithixotropy. The shear-induced thickening is shown to be the result of transient aggregated structures formed under shear. Addition of a third component, b-cyclodextrin-a molecule known to disrupt hydrophobic associations-to the mixture helped us advance the understanding of the nature of associative thickener-surfactant interactions that cause the transient shear-thickening behavior. Results indicate that, while overall viscosity of the HEAT/surfactant mixtures is decreased by b-cyclodextrin, the shear-induced thickening is unaffected. An intermolecular interaction model to describe the transient thickening mechanism is presented.

show abstract

“…Inoue and colleagues, connected β‐CD and cinnamoyl moiety carrying oligo(ethylene glycol) (OEG), in which the β‐CD moiety included strongly the cinnamoyl moiety. When a half equivalent of 1‐adamantanecarboxylic acid (AdCA) was added to the β‐CD modified with cinnamoyl OEG, the exchange between inclusion and dissociation states was observed by NMR (Scheme ).…”

Section: Rotaxanes and Pseudorotaxanesmentioning

confidence: 99%

Cyclodextrin‐Based Rotaxanes: from Rotaxanes to Polyrotaxanes and Further to Functional Materials

2019

Self Cite

View full text Add to dashboard Cite

This minireview overviews rotaxanes and pseudorotaxanes containing cyclodextrins (CDs) as the rotor component. Since CDs interact with molecules, e.g., hydrophobic compounds of the size and shape matching their cavity, to form inclusion complexes in aqueous media, CDs are an important class of macrocyclic compounds as rotor components of rotaxanes and pseudorotaxanes. Research on CD‐based rotaxanes has begun with the synthesis of rotaxanes from low molecular weight axis molecules and then developed into the construction of molecular machines and polyrotaxanes. Recently, the research has further developed into macroscopic functional materials, e.g., slide‐ring gels, macromolecular assemblies, self‐healing materials, and soft actuators. In the present article, typical examples of CD‐based rotaxanes and pseudorotaxanes are described; synthesis of rotaxane and construction of molecular machine are described in Section 2, synthesis of polyrotaxanes is dealt with in Section 3, and development of macroscopic functional materials based on rotaxane structure is discussed in Section 4.

show abstract

Self-Threading of a Poly(ethylene glycol) Chain in a Cyclodextrin-Ring: Control of the Exchange Dynamics by Chain Length

Cited by 48 publications

References 20 publications

Photoswitchable Supramolecular Catalysis by Interparticle Host–Guest Competitive Binding

Photoswitchable Supramolecular Catalysis by Interparticle Host–Guest Competitive Binding

Shear-thickening in aqueous surfactant-associative thickener mixtures

Cyclodextrin‐Based Rotaxanes: from Rotaxanes to Polyrotaxanes and Further to Functional Materials

Contact Info

Product

Resources

About