Design of blue fluorescence emitter star-shaped macromolecules based on pyrene and anthracene

Abd‐El‐Aziz, Alaa S.; Abdelghani, Amani A.; Wagner, Brian D.; Pearson, Jason K.; Awad, Mohamed K.

doi:10.1016/j.polymer.2016.06.032

Cited by 18 publications

(24 citation statements)

References 72 publications

(64 reference statements)

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“…The AIE of the zero‐generation DEN‐TPE ( 156 ) and the first‐generation DEN‐TPE ( 157 ) was found to be quenched at higher water content. The authors attributed this observation to the change in the morphology of these dendrimers at high water content, possibly leading to an interaction of the iron centers with the TPE units, which would efficiently quench the fluorescence . By demetallating the dendrimers the results were improved, as expected.…”

Section: Aggregation Behavior Of Dendrimersmentioning

confidence: 58%

“…Along similar lines, star‐shaped macromolecules 173 and 174 capped with fluorescent species such as pyrene and anthracene have been synthesized, which exhibit aggregation enhanced excimer emission (AEEE) ( Figure ) . Only low emission intensities are observed in the visible region in dilute solution and this is due to the predominance of the monomer emission, which occurs mainly in the UV‐A part of the spectrum (invisible to the human eye).…”

Section: Aggregation Behavior Of Dendrimersmentioning

confidence: 92%

“…Abd‐El‐Aziz and coworkers have generated fluorescence from macromolecule‐based dendritic and star‐shaped structures . Their work has been focused on the redox active organoiron sandwich complex, η 6 ‐dichloro‐η 5 cyclopentadienyliron(II) as a functional and structural motif to create dendrimers which are photoactive in the aggregated and non‐aggregated states.…”

Section: Light‐harvesting Dendrimer Systemsmentioning

confidence: 99%

“…Representative fluorescence spectra of star‐shaped macromolecule with anthracene moieties 174 (10 µ m ), λ ex = 410 nm in pure THF and upon addition water fraction with ( I E / I M ) intensity ratios. Reproduced with permission . Copyright 2016, Elsevier Ltd.…”

Section: Aggregation Behavior Of Dendrimersmentioning

confidence: 99%

“…This process can also result in the useful formation of excimer and exciplex species within the dendrimer, which will exhibit vastly different emission wavelengths . Furthermore, dendrimers which contain metal ions have been generated to combine the redox properties of metals with other dendrimeric properties . In this review we will focus on light‐harvesting dendrimeric materials with many illustrative examples.…”

Section: Introductionmentioning

confidence: 99%

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Advances in Light‐Emitting Dendrimers

Abd‐El‐Aziz

Abdelghani

Wagner

et al. 2018

Macromol. Rapid Commun.

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with increasing generation), or even at the branching sites. Such dendrimeric structures with incorporated chromophores provide a mimic of the photosynthetic light-harvesting system, in which antenna chromophores surround the inner reaction center. [35][36][37][38] Each photoactive group within a dendrimer can show quite different emission and energy-transfer properties compared with those of the same chromophore within a small molecule (or as a separate free molecule itself), as a result of the close spatial proximity to neighboring moieties. For instance, in well-designed dendrimers, photoexcited chromophores can undergo energy transfer to other units, funneling the energy through the antenna framework toward the core, which can serve as the basis for solar energy conversion, [39,40] luminescent sensors, [41,42] and photoinduced electron transfer (PET) between units of the dendrimers. [43][44][45] This process can also result in the useful formation of excimer and exciplex species within the dendrimer, which will exhibit vastly different emission wavelengths. [46][47][48] Furthermore, dendrimers which contain metal ions have been generated to combine the redox properties of metals with other dendrimeric properties. [27,[49][50][51][52][53][54] In this review we will focus on light-harvesting dendrimeric materials with many illustrative examples. DendrimersThe design of dendrimers with various chromophores has attracted significant attention in light of the dual effect of the luminescence of the chromophores and the morphology of the synthesized dendrimers. Recent developments in this field stem from their wide potential applications, including organic light-emitting diodes, photonic switches and upconversion lasers, as well as sensors and electronic devices. The focus of this comprehensive review is on the design and properties of various classes of lightharvesting dendrimeric materials.

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Section: Aggregation Behavior Of Dendrimersmentioning

confidence: 58%

Section: Aggregation Behavior Of Dendrimersmentioning

confidence: 92%

Section: Light‐harvesting Dendrimer Systemsmentioning

confidence: 99%

Section: Aggregation Behavior Of Dendrimersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Advances in Light‐Emitting Dendrimers

Abd‐El‐Aziz

Abdelghani

Wagner

et al. 2018

Macromol. Rapid Commun.

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Nonionic Surfactants as Potential Carriers of a Synthesized Pyrimidine Derivative: Spectroscopic and Quantum Chemical Investigations

et al. 2018

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Currently, a major problem is the poor water solubility and bioavailability of many pharmaceuticals. Using different types of surfactants is an effective strategy to overcome this problem. Herein a pyrimidine-based Schiff base, 2-[2-(anthracen-9-ylmethylene) hydrazinyl]-4,6-dimethyl pyrimidine (ANHP), has been synthesized and characterized by different spectroscopic methods. A comparative study of drug carrier properties of cationic, anionic, and the nonionic surfactants with this pyrimidine derivative (ANHP) in aqueous solution is the key research interest of this work. From fluorescence studies, the interaction of ANHP with the different types of surfactants were [a]

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Pharmacological Evaluation of Novel Organoiron Dendrimers as Antimicrobial and Anti‐Inflammatory Agents

Abd‐El‐Aziz

Abdelghani

El-Ghezlani

et al. 2020

Macromolecular Bioscience

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The synthesis of a novel and attractive class of nonsteroidal anti‐inflammatory and antimicrobial organoiron dendrimers attached to the well‐known drug ibuprofen is achieved. The structures of these dendrimers are established by spectroscopic and analytical techniques. The antimicrobial activity of these dendrimers is investigated and tested against five human pathogenic Gram‐positive and Gram‐negative bacteria, and minimum inhibitory concentrations are reported. Some of these synthesized dendrimers exhibit higher inhibitory activity against methicillin‐resistant Staphylococcus aureus, vancomycin‐resistant Enterococcus faecium, and Staphylococcus warneri compare to the reference drugs. As well, the in vitro and in vivo anti‐inflammatory activities of these dendrimers are evaluated. The results of in vivo anti‐inflammatory activity and histopathology of inflamed paws show that all dendrimers display considerable anti‐inflammatory activity; however, second‐generation dendrimer (G2‐D6) shows the best anti‐inflammatory activity, which is more potent than the commercial drug ibuprofen at the same tested dose. Results of the toxicity study reveal that G2‐D6 is the safest drug on biological tissues.

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Design of blue fluorescence emitter star-shaped macromolecules based on pyrene and anthracene

Cited by 18 publications

References 72 publications

Advances in Light‐Emitting Dendrimers

Advances in Light‐Emitting Dendrimers

Nonionic Surfactants as Potential Carriers of a Synthesized Pyrimidine Derivative: Spectroscopic and Quantum Chemical Investigations

Pharmacological Evaluation of Novel Organoiron Dendrimers as Antimicrobial and Anti‐Inflammatory Agents

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