Water‐Binding‐Mediated Gelation/Crystallization and Thermosensitive Superchirality

Xing, Pengyao; Li, Yongxin; Wang, Yang; Li, Pei‐Zhou; Chen, Hongzhong; Phua, Soo Zeng Fiona; Zhao, Yanli

doi:10.1002/anie.201802825

Cited by 52 publications

(39 citation statements)

References 32 publications

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“…Thus, crystal formation can lead to increased gel fluidity or its complete collapse. Whereas gel–crystal transitions can be induced in some systems by modulating an environmental factor or introducing an external stimulus, most reports describe its spontaneous occurrence over time periods that vary between months and hours. There are also uncommon reports of rapid transitions occurring in transient gels within minutes …”

Section: Introductionmentioning

confidence: 99%

Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition

et al. 2019

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Supramolecular gels often become destabilizedb y the transition of the gelator into amore stable crystalline phase, but often the long timescale and sporadic localization of the crystalline phase preclude ap ersistent observation of this process.W epresent apentapeptide gel-crystal phase transition amenable for continuous visualization and quantification by common microscopic methods,a llowing the extraction of kinetics and visualization of the dynamics of the transition. Using optical microscopya nd microrheology,w es howt hat the transition is as poradic event in whichg el dissolution is associated with microcrystalline growth that follows as igmoidal rate profile.The two phases are based on b-sheets of similar yet distinct configuration. We also demonstrate that the transition kinetics and crystal morphology can be modulated by extrinsic factors,i ncluding temperature,s olvent composition, and mechanical perturbation. This work introduces an accessible model system and methodology for studying phase transitions in supramolecular gels.

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Section: Introductionmentioning

confidence: 99%

Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition

et al. 2019

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“…This result indicated that the water plays important role in the assembly process. The water may supply assembly driving forces based on the solvent effect, hydrogen bonding interactions as well as hydrophobic interactions [15] . The critical gelation concentration (CGC) was found to be 0.3 % in H 2 O: DMF (v: v,3 : 7, 10 mg mL −1 =1 %) or 0.5 % in H 2 O: DMSO (v: v, 2 : 8), respectively.…”

Section: Resultsmentioning

confidence: 99%

Theoretical and Experimental Insights into the Self‐Assembly and Ion Response Mechanisms of Tripodal Quinolinamido‐Based Supramolecular Organogels

Yang

Adam

et al. 2021

ChemPlusChem

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The exploration and understanding of self-assembly and stimuli-responsive mechanisms of supramolecular systems are of fundamental importance for researchers to plan syntheses reasonably. Herein, the self-assembly and ions responsive mechanisms of a tripodal quinolinamido-based supramolecular organogel (TBT-gel) were investigated through experiments and theoretical calculations including independent gradient model (IGM), localized orbitals locator (LOL) and hole-electron theory. According to these studies, the self-assembly mechanism of TBT-gel was based on strong threefold H-bonding and π-π interactions, which induced the TBT forming helical, onedimensional supramolecular polymer. After addition of Fe 3 + into the TBT-gel, the one-dimensional supramolecular polymer had been crosslinked by the Fe 3 + through coordination interaction and formed a metallogel (TBT-Fe-gel). Interestingly, the TBT-gel showed selective fluorescent response for Fe 3 + and F À based on a competitive coordination mechanism. Moreover, the study on fluorescence responsive mechanism of TBT-gel for Fe 3 + and F À implied the ICT mode governs both the electron excitation and de-excitation processes. The calculated results were in agreement with the corresponding experimental results. Notably, the quantum chemical calculations provided a deep understanding and visualized presentation of the assembly and stimuli-responsive mechanisms.

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“…[9] Furthermore,r esponsive gel-to-crystal and gel-to-solution phase transitions can be triggered by various external and internal stimuli, such as light, pH, temperature,ionic strength, and the choice of solvents. [10] Water has very limited solubility in oils like benzene, toluene,a nd trichloromethane. [11] Theh igh surface tension makes water transportation in such media difficult [12] and phase separations will usually occur.…”

Section: Introductionmentioning

confidence: 99%

The Ultrafast Assembly of a Dipeptide Supramolecular Organogel and its Phase Transition from Gel to Crystal

Yuan

Fei

et al. 2019

Angew Chem Int Ed

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Ag el-to-crystal phase transition of ad ipeptide supramolecular assembly mediates active water transportation in oils.T he addition of water into ultrafast-assembling dipeptide organogels can induce al amellar-to-hexagonal structural transformation of dipeptide molecular arrangement. Consequently,aphase transition from gel to crystal occurs and in turn water is transported in the dipeptide crystal via welldefined channels.O namacroscopic scale,w ater transport in the bulk system exhibits an anisotropic characteristic, which can be tuned by the presence of ions in the Hofmeister series. These favorable features enable the automatic separation of dispersed nanoparticles from dissolved electrolytes in aqueous solution. These findings demonstrate the potential of this assembled system for active filtration without external pressure.

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Water‐Binding‐Mediated Gelation/Crystallization and Thermosensitive Superchirality

Cited by 52 publications

References 32 publications

Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition

Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition

Theoretical and Experimental Insights into the Self‐Assembly and Ion Response Mechanisms of Tripodal Quinolinamido‐Based Supramolecular Organogels

The Ultrafast Assembly of a Dipeptide Supramolecular Organogel and its Phase Transition from Gel to Crystal

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