High aspect ratio, processable coordination polymer gel nanotubes based on an AIE-active LMWG with tunable emission

Suresh, Venkata M.; De, Anangsha; Maji, Tapas Kumar

doi:10.1039/c5cc05453b

Cited by 53 publications

(43 citation statements)

References 44 publications

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“…Thus, the CPPP ligand in the solid state has a more planar structure than that in Ag 12 CPPP , resulting in better conjugation and longer wavelength emission . These structural analyses suggest that the fluorescence turn‐on and blueshift from CPPP to Ag 12 CPPP originate from the coordinative immobilization of fluorescent CPPP cores inside rigid SCAM matrices, that is, the MCIE effect . More evidence for the MCIE effect can be found in Table ; the lifetime of CPPP in Ag 12 CPPP is shorter than that of CPPP in CH 3 CN or the solid state, demonstrating that CPPP in Ag 12 CPPP has a more rigid structure than that of CPPP in CH 3 CN or the solid state.…”

Section: Resultsmentioning

confidence: 99%

Matrix Coordination Induced Emission in a Three‐Dimensional Silver Cluster‐Assembled Material

Wang

Luo

et al. 2019

Chemistry A European J

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Developing highly luminescent and extensively stable silver cluster‐assembled materials (SCAMs) from the inferior luminogens and unstable silver cluster is an important and challenging issue. Herein, a new luminescent three‐dimensional SCAM (Ag12CPPP, [Ag12(StBu)6(CF3COO)6(CPPP)2(DMAc)12]n; CPPP=2,5‐bis(4‐cyanophenyl)‐1,4‐bis(4‐(pyridine‐4‐yl)‐phenyl)‐1,4‐dihydropyrrolo[3,2‐b]pyrrole, DMAc=dimethylacetamide) was designed and synthesized with a quadridentate rigid emission ligand (CPPP) and a silver–chalcogenolate cluster (SCC) containing 12 AgI atoms. The luminescence study indicates that CPPP is an aggregation‐caused quenching (ACQ) molecule with twisted intramolecular charge transfer (TICT) character. Benefiting from the strong immobilization effect in the robust framework, the quantum yield of CPPP is greatly enhanced in Ag12CPPP compared with that of CPPP in solution or in the solid state. As a result, Ag12CPPP exhibits typical matrix coordination induced emission (MCIE) effect. Such efficient rigidifying methodology provides a promising approach for enhancing luminescence of ACQ molecules in an aggregated state and strengthening the silver cluster in an unstable state.

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Section: Resultsmentioning

confidence: 99%

Matrix Coordination Induced Emission in a Three‐Dimensional Silver Cluster‐Assembled Material

Wang

Luo

et al. 2019

Chemistry A European J

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“…These results implied that the π–π stacking of benzene units in the gel was strengthened with increasing concentration. The chemical shift of proton in imine (−C H = N −) was also affected in the gelation, which shifted downfield from 8.36 to 8.38 ppm, implying the driving forces were van der Waals forces and π–π interactions in the gelation …”

Section: Resultsmentioning

confidence: 99%

“…The AIE behavior of the gelator was evaluated by using a fluorescence assay (Figure D). When the gelator molecules self‐assembled into a gel, the intramolecular motion and rotations of triphenylamine were restricted to suppress the energy consumption and resulted in the fluorescence emergence . The AIE effect was further used to detect the thermal‐sensitive sol–gel transition (Figure E).…”

Section: Resultsmentioning

confidence: 99%

A Multiple Stimuli‐Sensitive Low‐Molecular‐Weight Gel with an Aggregate‐Induced Emission Effect for Sol–Gel Transition Detection

Wang

Liu

et al. 2018

ChemistryOpen

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A low‐molecular‐weight gel (LMWG) with a hydrazone moiety and an aggregate‐induced emission (AIE) unit was fabricated; the self‐assembly and disassembly of the LMWG under different stimuli conditions were studied. The LMWG exhibited multiple stimuli sensitivity with temperature, light, ions, and ionic strength. The hydrazone was integrated into the gelator to act as ion sensing sites and hydrogen bond donor groups to fulfil the task of ion recognition of Ni2+, BH4 −, and OH−, as well as ion‐controlled reversible sol–gel recovery by adding H+ for deprotonation; it also broke under UV irradiation to evoke light‐sensitivity. In addition, the sol–gel transition of the gel was detected by the AIE effect. The research provided an effective strategy in fabricating multiple stimuli‐sensitive LMWGs for potential biomedical applications.

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“…1−3 Such probes can sense and photophysically respond to the friction generated by intermolecular forces, thereby acting as tools to measure viscosity (η) at the nanoscale. 2,4−6 As molecules self-assemble in solution, there are a myriad of factors which can control fibril and fiber growth, their directional and hierarchical architectures, and the resultant dynamic properties of these structures. 7,8 To better understand both the static nature of the structuring gellant and dynamic nature of a gel’s bulk liquid, several different techniques have been developed to study both viscosity and flow.…”

Section: Introductionmentioning

confidence: 99%

Unique Photophysical Behavior of Coumarin-Based Viscosity Probes during Molecular Self-Assembly

et al. 2019

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Intermolecular interactions impact self-assembly phenomena having a variety of bio/chemical, physical, and mechanical consequences. Nevertheless, the underlying mechanisms leading to a controlled stereo- and chemo-specific aggregation at the molecular level often remain elusive because of the intrinsically dynamic nature of these processes. Herein, we describe two 3-styryl coumarin molecular rotors capable of probing subtle intermolecular interactions controlling the self-assembly of a small-molecule organogelator. Complementing the characterization of the gel via circular dichroism and atomic force microscopy, thorough spectroscopic investigations on these sensors were carried out to prove their high chemical and spatial affinity toward the 3D supramolecular network. The results were further supported by molecular dynamics simulations to reveal further critical insights into the gelator’s dynamic self-assembly mechanism. These sensors could potentially serve as templates to study a variety of soft-supramolecular architectures and the ways in which they assemble.

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High aspect ratio, processable coordination polymer gel nanotubes based on an AIE-active LMWG with tunable emission

Cited by 53 publications

References 44 publications

Matrix Coordination Induced Emission in a Three‐Dimensional Silver Cluster‐Assembled Material

Matrix Coordination Induced Emission in a Three‐Dimensional Silver Cluster‐Assembled Material

A Multiple Stimuli‐Sensitive Low‐Molecular‐Weight Gel with an Aggregate‐Induced Emission Effect for Sol–Gel Transition Detection

Unique Photophysical Behavior of Coumarin-Based Viscosity Probes during Molecular Self-Assembly

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