Encapsulation and quantification of multiple dye guests in unmodified poly(amidoamine) dendrimers as a function of generation

Kline, Katrina K.; Morgan, Elizabeth J.; Norton, Lisa K.; Tucker, Sheryl A.

doi:10.1016/j.talanta.2009.01.051

Cited by 16 publications

(33 citation statements)

References 15 publications

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“…These differences in K bind values reveal that stronger interactions between the dyes and the bigger dendrimers are occurring, which could lead to the formation of the host/guest complex. Many reports deal with the inclusion of dyes inside both PAMAM and PPI dendrimers . In particular, G4 and G5 are assumed to be globular in solution and their structures have inner void cavities that are capable of accommodating small guest molecules, such as dyes …”

Section: Resultsmentioning

confidence: 99%

“…Kline et al. observed the formation of host/guest complexes between several dyes and PAMAM dendrimers . Other authors have also reported the selective uptake of dyes into dendrimers .…”

Section: Introductionmentioning

confidence: 99%

“…[7] Kline et al observed the formationo fh ost/guest complexes between several dyes and PAMAMdendrimers. [8] Other authors have also reported the selectiveu ptake of dyes into dendrimers. [2] However,c aution needs to be taken when using dye/dendrimer mixtures to determinec ellular uptake and fluorescencel ifetimes, due to the stochastic nature of the dye/dendrimer biodistribution.…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Photophysics and Photochemistry of Xanthene Dyes in the Presence of Polyamidoamine (PAMAM) Dendrimers

2018

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The photophysical and photochemical properties of the xanthene dyes Eosin Y, Erythrosin B, and Rose Bengal are evaluated in the presence of amino-terminated polyamidoamine (PAMAM) dendrimers of relatively high generation (G3-G5) in alkaline aqueous solution. UV/Vis absorption and fluorescence spectra of the dyes show bathochromic shifts, which correlate with the size of the dendrimer. Binding constants (K ) are calculated from absorption data. The resulting high K values indicate strong interactions between both molecules. Triplet-triplet absorption spectra of the dyes are recorded by laser flash photolysis, and a decrease in the triplet lifetimes is observed in the presence of dendrimers. At the same time, an increase in the absorption of the semireduced form of the dyes is observed. Rate constants for triplet quenching ( k ) and radical quantum yields (Φ ) are obtained. The results are explained by a very efficient electron-transfer process from PAMAM to xanthene dyes for all of the dye/dendrimer couples that are evaluated.

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Section: Resultsmentioning

confidence: 99%

“…Kline et al. observed the formation of host/guest complexes between several dyes and PAMAM dendrimers . Other authors have also reported the selective uptake of dyes into dendrimers .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Comparative Study on the Photophysics and Photochemistry of Xanthene Dyes in the Presence of Polyamidoamine (PAMAM) Dendrimers

2018

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“…One interesting application of dendrimers functionalized at the periphery is as light harvesters, as the number of terminal dyes doubles with each increase in generation. The study of the interactions amongst dendrimers and fluorescent probes is useful for the investigation of a number of important intermolecular processes, including binding, host/guest complexation, and electron or energy transfer . Furthermore, the fluorescent probe/dendrimer pairing may have relevant applications in the polymer field, such as visible light photo‐initiating systems.…”

Section: Dyes As Structural Probes Of Dendrimersmentioning

confidence: 99%

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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“…PAMAM dendrimers are nanoscopic spherical macromolecules composed of polyamidoamino units with repeating dendritic branching. PAMAM dendrimer can incorporate guest molecules, such as platina, gold, palladium nanoparticles, and organic compounds such as phenol blue, into the interior formed by the branch chains. PAMAM dendrimers incorporating inorganic particles can play a role in recyclable catalysis.…”

Section: Introductionmentioning

confidence: 99%

Preparation of amphiphilic diblock copolymers with pendant hydrophilic phosphorylcholine and hydrophobic dendron groups and their self-association behavior in water

Osawa

Imae

Ujihara

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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Generation 3.5 poly(amido amine) dendron (G3.5) with 16 n‐butyl terminal groups containing an acrylamide monomer (AaUG3.5) was prepared by condensation between an amino focal group in G3.5 and 11‐acrylamidoundecanoic acid. AaUG3.5 was polymerized using poly(2‐methacryloyloxyethyl phosphorylcholine) (pMPC)‐based macro‐chain transfer agent via reversible addition‐fragmentation chain transfer (RAFT) radical polymerization to obtain amphiphilic diblock copolymers with different compositions. The diblock copolymers (PmDn) were composed of a hydrophilic pMPC block and hydrophobic pendant dendron‐bearing block, where P and D represent pMPC and pAaUG3.5, respectively, and m and n represent the degree of polymerization for each block, respectively. P296D1 and P98D3 formed vesicles and large compound micelles and vesicles, respectively, which was confirmed by light scattering measurements and transmission electron microscopic (TEM) observations. The large compound micelles formed from P98D3 could not incorporate hydrophilic guest polymer molecules, because the aggregates did not have a hydrophilic hollow core. In contrast, the vesicles formed from P269D1 could incorporate hydrophilic guest polymer molecules into the hollow core. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4923–4931

show abstract

Encapsulation and quantification of multiple dye guests in unmodified poly(amidoamine) dendrimers as a function of generation

Cited by 16 publications

References 15 publications

A Comparative Study on the Photophysics and Photochemistry of Xanthene Dyes in the Presence of Polyamidoamine (PAMAM) Dendrimers

A Comparative Study on the Photophysics and Photochemistry of Xanthene Dyes in the Presence of Polyamidoamine (PAMAM) Dendrimers

Advances in Light‐Emitting Dendrimers

Preparation of amphiphilic diblock copolymers with pendant hydrophilic phosphorylcholine and hydrophobic dendron groups and their self-association behavior in water

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