Polymeric crown ethers: LCST behavior in water and stimuli-responsiveness

Huang, Dechun; Zhang, Qiao; Deng, Yan; Luo, Zheng; Li, Bo; Shen, Xin; Qi, Zhenhui; Dong, Shengyi; Gao, Yan; Chen, Wei

doi:10.1039/c8py00412a

Cited by 27 publications

(18 citation statements)

References 67 publications

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“…Herein, we report a new organoplatinum(II) supramolecular complex possessing thermo-/anion-sensitive properties. Simultaneously, benzo-21-crown-7 ( B21C7 ) and its derivatives display typical lower critical solution temperature (LCST) phase behavior in water according to previous work …”

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confidence: 61%

“…The glycol chains in B21C7 can form hydrogen bonds with water molecules at low temperature, while supramolecular interactions are destroyed when the temperature exceeds the critical point. It has been used in some small molecules and polymeric structures to investigate thermoresponsiveness . Thus, in this work B21C7 units were chosen as the thermosensitive cores.…”

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confidence: 99%

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Thermo/Anion Dual-Responsive Supramolecular Organoplatinum–Crown Ether Complex

Zhang

Zhao

et al. 2020

Org. Lett.

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Stimuli-responsive complexes have attracted significant interest in supramolecular chemistry and material science. In this study, a new organoplatinum–crown supramolecular complex has been successfully constructed via the coordination of benzo-21-crown-7 (B21C7) units and cis-Pt(PEt3)2(OTf)2. The resulting complex displays intriguing lower critical solution temperature (LCST) and anion-sensitive deassembly behavior. This organoplatinum–crown ether complex with dual-responsive behavior is a promising candidate for stimuli-responsive materials.

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confidence: 61%

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confidence: 99%

Thermo/Anion Dual-Responsive Supramolecular Organoplatinum–Crown Ether Complex

Zhang

Zhao

et al. 2020

Org. Lett.

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“…[ 25 ] It speculates that the hydration on the PAB polymer would be damaged upon heating, which makes the whole polymer hydrophobic and insoluble in the water. [ 26 ] Unexpectedly, the temperature‐dependent turbidity curve shows that the LCST of PAB polymers has a negative shift with increasing the content of hydrophilic acrylic acid. The PAB polymers with high content of benzo‐18‐crown‐6‐acrylamide groups are considered to cause significant steric hindrance impeding the polymer shrinking.…”

Section: Resultsmentioning

confidence: 99%

Pseudo Polyampholytes with Sensitively Ion‐Responsive Conformational Transition Based on Positively Charged Host–Guest Complexes

Qin

Liu

Yang

et al. 2022

Macromol. Rapid Commun.

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Biological polyampholytes are ubiquitous in living organisms with primary functions including serving as transporters for moving chemical molecular species across the cell membranes. Synthetic amphoteric macromolecules that can change their phase states depending on the environment to simulate some properties of natural polyampholytes are of great interest. Here, the implementation of synthetic pseudo polymeric ampholytes is explored with ion‐recognition‐triggered conformational change. The phase transition behaviors of the ion‐recognition‐creative polyampholytes that contain deprotonated carboxylic acid groups as negative charges and 18‐crown‐6 units for forming positively charged host–guest complexes are systematically investigated. The ion‐recognition‐triggered phase transition behaviors of pseudo polyampholytes significantly depend on cation species and concentrations. Only those specific ions such as K+, Ba2+, Sr2+ and Pb2+ ions that can form 1:1 host–guest complexes with 18‐crown‐6 units in polymers enable control over conformational change like that of traditional pH‐dependent polyampholytes. By regulating the content of carboxylic acid groups to match the content of ion‐recognized positive charges provided by the host–guest complexes, the pseudo polyampholytes are more sensitive to the recognizable cations. Such ion‐recognition‐triggered amphoteric characteristics make the pseudo polyampholytes act like biological proteins, nucleic acids, and enzymes as molecular transporters, genetic code storage, and biocatalysts in artificial systems.

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“…Importantly, the formation of supramolecular polymers can overcome issues related to the preparation of traditional polymers, since the latter methods tend to require an auxiliary initiator, high temperatures, and long reaction times. Furthermore, the introduction of host-guest interactions can also endow the constructed supramolecular polymers with dynamic and reversible properties (Dong et al, 2012 ; Yan et al, 2014 ; Zhan et al, 2014a , b ; Huang et al, 2018 ; Wang et al, 2020 ). For example, Dong and co-workers made a supramolecular polymer network with dynamic reversibility, good malleability, and processability that depended on the formation of host-guest interactions between crown ethers and ammonium motifs of H2G2-type monomer (Wang et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Supramolecular Polymers Formed by Crown Ether-Based Host-Guest Interaction

et al. 2020

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Inspired by the vast array of assemblies present in nature, supramolecular chemistry has attracted significant attention on account of its diverse supra-structures, which include micelles, vesicles, and fibers, in addition to its extensive applications in luminescent materials, sensors, bioimaging, and drug delivery over the past decades. Supramolecular polymers, which represent a combination of supramolecular chemistry and polymer science, are constructed by non-covalent interactions, such as host-guest interactions, hydrogen bonding, hydrophobic or hydrophilic interactions, metal-ligand interactions, π-π stacking, and electrostatic interactions. To date, numerous host-guest recognition systems have been reported, including crown ethers, cyclodextrins, calixarenes, cucurbituril, pillararenes, and other macrocyclic hosts. Among them, crown ethers, as the first generation of macrocyclic hosts, provide a promising and facile alternative route to supramolecular polymers. In addition, the incorporation of fluorophores into supramolecular polymers could endow them with multiple properties and functions, thereby presenting potential advantages in the context of smart materials. Thus, this review focuses on the fabrication strategies, interesting properties, and potential applications of fluorescent supramolecular polymers based on crown ethers. Typical examples are presented and discussed in terms of three different types of building blocks, namely covalently bonded low-molecular-weight compounds, polymers modified by hosts or guests, and supramolecular coordination complexes.

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Polymeric crown ethers: LCST behavior in water and stimuli-responsiveness

Abstract: A crown ether-functionalized poly(vinyl alcohol) (PVA) system shows lower critical solution temperature (LCST) phase separation behavior in water.

Cited by 27 publications

References 67 publications

Thermo/Anion Dual-Responsive Supramolecular Organoplatinum–Crown Ether Complex

Thermo/Anion Dual-Responsive Supramolecular Organoplatinum–Crown Ether Complex

Pseudo Polyampholytes with Sensitively Ion‐Responsive Conformational Transition Based on Positively Charged Host–Guest Complexes

Fluorescent Supramolecular Polymers Formed by Crown Ether-Based Host-Guest Interaction

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