A novel thermo-responsive supramolecular organogel based on dual acylhydrazone: fluorescent detection for Al<sup>3+</sup> ions

Ma, Xinxian; Liu, Shiwei; Zhang, Zhifeng; Niu, Yan-Bing; Wu, Jincai

doi:10.1039/c7sm02141k

Cited by 55 publications

(22 citation statements)

References 66 publications

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“…Typically, low molecular weight organogelators form networks through physical interactions, while polymeric organogelators form networks through chain entanglements or a combination of chemical and physical cross-linking . Organogels can be responsive to a number of external stimuli depending on the cross-linking chemistry, including light, , temperature, ,, redox agents, ,, and ultrasound . Light is a useful external trigger to induce responses in stimuli-responsive materials, as it can be applied locally without suffering from diffusion effects and be switched “on” and “off” easily .…”

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Reversibly Softening and Stiffening Organogels Using a Wavelength-Controlled Disulfide-Diselenide Exchange

et al. 2020

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Wavelength-dependent light-responsive seleno-sulfide dynamic covalent bonds were used to prepare organogels with reversible changes in stiffness. The disulfide cross-link organogels prepared from norbornene-terminated poly(ethylene glycol) (PEG-diNB) and poly(2-hydroxypropyl methacrylate-stat-mercaptoethyl acrylate) (PEG-diNB-poly(HPMA-stat-MEMA)) polymers underwent exchange reactions with 5,5′-diselenide-bis(2-aminobenzoic acid) upon irradiation with UV light. Following irradiation with visible light, the seleno-sulfide bonds were cleaved, reforming disulfide cross-links and the 5,5′-diselenide-bis(2-aminobenzoic acid). Reduction in G′ with disulfide–diselenide exchange was consistent with that observed following a thiol–disulfide exchange reaction. Recovery of G′ upon disulfide bond formation was 85–95% of the initial value in the as-prepared gel over five cycles of bond cleaving and reformation. This initial study shows the potential of the wavelength-controlled disulfide–diselenide chemistry to develop light-responsive reversible organogels. These organogels have the potential to be used in functional materials such as polymeric actuators or biomimetic soft robotics.

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Reversibly Softening and Stiffening Organogels Using a Wavelength-Controlled Disulfide-Diselenide Exchange

et al. 2020

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“…Ma et al obtained a Y 3+ enhanced blue light–emitting gel with an arylhydrazone‐functionalized dual benzimidazole derivative gelator (Figure , compound 20) in a N , N ′‐dimethylformamide (DMF)–water solution. They also found that Al 3+ ions can induce a blue light–emitting metallogel with a dual arylhydrazone‐functionalized gelator (Figure , compound 21) in dimethyl sulfoxide (DMSO) . Recently, a series of luminescent metallogels were synthesized from dinuclear platinum(II) bzimpy complexes ( Figure a) by Yam and co‐workers .…”

Section: Fundamental Applications Of Metallogelsmentioning

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Metallogels: Availability, Applicability, and Advanceability

et al. 2019

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amount of cross-linked solid. According to the nature of solvents, gels are categorized into hydrogel and organogel to indicate whether the solvent is water or organic solvent(s), respectively. As to the gelation driving forces, gels can be classified into physical gels in which intermolecular interactions are responsible for gel formation, and chemical gels in which the gel skeleton is cross-linked by covalent bonds.Incorporation of metal components (metal ions, metal-organic molecules, and metal nanoparticles) is an effective way to locally establish extra interactions among the building blocks and consequently trigger gel formation, [2][3][4] weaken [5] or enhance [6] gel strength, and modify gel morphology. [7,8] Moreover, addition of metal components is a straightforward way to integrate the specific properties of metals with the properties of organic matrix, therefore to tune properties like conductivity, [9] color, [10,11] rheological behavior, [12] adsorption, [13] emission, [14] photophysical properties, [15] magnetism, [16,17] antibacterial activities, [18,19] catalytic activities, [20][21][22][23] redox activities, [24,25] and selfhealing properties. [26][27][28] Therefore, a broad response range to physical and chemical stimuli can be achieved. For instance, the incorporation of multivalence ions such as Fe 2+ /Fe 3+ , [25,29] Co 2+ / Co 3+ , [30] Cu + /Cu 2+ , [31] results in redox reactive hydrogels; the incorporation of magnetic nanoparticles like Fe 3 O 4[17] causes the gel to respond to external magnetic fields. In addition to the abovementioned intrinsically functional superiorities, metallogels can also serve as ideal templates to generate new materials, [13,22,23,32,33] such as 3D networks, [34] porous structures, [35] chiral materials, [36][37][38] quantum dots, [39] and nanorods. [40] Following the rapid advancement of exploration on the knowledge acquisition toward the major roles that metallogels are playing in catalysis, sensing, biomedicine, electronics, and optical devices, the focus of research has been transferred to the design principles of metallogels in the last decade. Owing to the advancements in the instrumental characterizations and theoretical calculations, [41] a number of pioneering efforts on metallogel design have been made and several innovative reviews have summarized these inspiring contributions. [32,[42][43][44] Despite their extensively acknowledged application advantages in many fields, the discovery of new metallogels with expected functionalities is still highly dependent on experimental screening and serendipity. The challenge stems from the susceptible balance among those complicated intermolecular interactions and the elaborate structure requirements of metallogels.Another research niche that needs to be clarified before discussing recent development of metallogels is: how to sort Introducing metal components into gel matrices provides an effective strategy to develop soft materials with advantageous properties such as: optical activity, conductivity, magn...

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“…19,327,332,333 Furthermore, in some cases, a heat-cool operation was performed after addition of the guest analytes onto the gels. 326,[334][335][336][337][338][339][340] Here, we discuss the possibilities of modifying gel properties by various chemical analytes in a post-assembly pathway at room temperature. Yao et al explored an acylhydrazone functionalized benzimidazole gelator in multianalyte sensing in a gel-to-gel fashion (Fig.…”

Section: (Vii) Post Assembly Fabrication Of Gels By Chemical Analytesmentioning

confidence: 99%

Stimuli responsive dynamic transformations in supramolecular gels

2021

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A novel thermo-responsive supramolecular organogel based on dual acylhydrazone: fluorescent detection for Al³⁺ ions

Cited by 55 publications

References 66 publications

Reversibly Softening and Stiffening Organogels Using a Wavelength-Controlled Disulfide-Diselenide Exchange

Reversibly Softening and Stiffening Organogels Using a Wavelength-Controlled Disulfide-Diselenide Exchange

Metallogels: Availability, Applicability, and Advanceability

Stimuli responsive dynamic transformations in supramolecular gels

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A novel thermo-responsive supramolecular organogel based on dual acylhydrazone: fluorescent detection for Al3+ ions

Cited by 55 publications

References 66 publications

Reversibly Softening and Stiffening Organogels Using a Wavelength-Controlled Disulfide-Diselenide Exchange

Reversibly Softening and Stiffening Organogels Using a Wavelength-Controlled Disulfide-Diselenide Exchange

Metallogels: Availability, Applicability, and Advanceability

Stimuli responsive dynamic transformations in supramolecular gels

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A novel thermo-responsive supramolecular organogel based on dual acylhydrazone: fluorescent detection for Al³⁺ ions