Strong Blue Photoluminescence and ECL from OH-Terminated PAMAM Dendrimers in the Absence of Gold Nanoparticles

Lee, Wan In; Bae, Yoonjung; Bard, Allen J.

doi:10.1021/ja0475914

Cited by 373 publications

(308 citation statements)

References 10 publications

(14 reference statements)

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“…While NH 2 -terminated PAMAM yielded gold clusters with indistinguishable fluorescence properties compared to clusters in PAMAM-OH, it failed to produce a fluorescent product upon similar persulfate oxidation, as similarly reported in Ref. (95). Furthermore, although addition of Na 2 S quenched the emission of both PAMAM-OH encapsulated Au 8 and persulfate-oxidized PAMAM-OH prepared according to Ref.…”

Section: Scaffold Dependence Of Emissionsupporting

confidence: 74%

“…Although there are no chromophores in PAMAM-OH, blue emission at 450 nm has recently been reported from these OH-terminated PAMAM dendrimers after oxidation with persulfate, leading to the suggestion that Au 3+ similarly oxidizes PAMAM to yield a non-auric fluorophore with similar emission to that which we reported for Au 8 (95). While NH 2 -terminated PAMAM yielded gold clusters with indistinguishable fluorescence properties compared to clusters in PAMAM-OH, it failed to produce a fluorescent product upon similar persulfate oxidation, as similarly reported in Ref.…”

Section: Scaffold Dependence Of Emissionsupporting

confidence: 62%

“…Furthermore, although addition of Na 2 S quenched the emission of both PAMAM-OH encapsulated Au 8 and persulfate-oxidized PAMAM-OH prepared according to Ref. (95), the resulting species displayed distinctly different emission spectra, thereby clearly distinguishing these species ( Figure 7). Au nanodot emission is simply quenched with addition of Na 2 S without spectral changes until 500-fold excess of Na 2 S is added.…”

Section: Scaffold Dependence Of Emissionmentioning

confidence: 96%

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Highly fluorescent, water-soluble, few-atom noble metal quantum dots have been created that behave as multi-electron artificial atoms with discrete, size-tunable electronic transitions throughout the visible and near IR. These "molecular metals" exhibit highly polarizable transitions and scale in size according to the simple relation, E fermi /N 1/3 , predicted by the free electron model of metallic behavior. This simple scaling indicates that fluorescence arises from intraband transitions of free electrons and that these conduction electron transitions are the low number limit of the plasmonthe collective dipole oscillations occurring when a continuous density of states is reached. Providing the "missing link" between atomic and nanoparticle behavior in noble metals, these emissive, watersoluble Au nanoclusters open new opportunities for biological labels, energy transfer pairs, and light emitting sources in nanoscale optoelectronics.

show abstract

Section: Scaffold Dependence Of Emissionsupporting

confidence: 74%

Section: Scaffold Dependence Of Emissionsupporting

confidence: 62%

Section: Scaffold Dependence Of Emissionmentioning

confidence: 96%

See 1 more Smart Citation

Highly Fluorescent Noble-Metal Quantum Dots

Zheng

Nicovich

Dickson

2007

Annu. Rev. Phys. Chem.

1,220

1,115

View full text Add to dashboard Cite

show abstract

“…In addition, some dendritic polymers without any fluorophores were investigated to show strong fluorescence, such as poly (amido amines) (PAMAM) dendrimer, poly(propylene imine) (PPI) dendrimer and hyperbranched poly(amino ester). [11][12][13] However, as far as we know, a dendritic polymer with both light-sensitive and thermal-sensitive properties has not been reported before.…”

Section: 2mentioning

confidence: 99%

Thermal sensitive fluorescent hyperbranched polymer without fluorophores

Wang

Meng

et al. 2008

J. Polym. Sci. A Polym. Chem.

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“…[5] Another effective strategy is developing nonconventional luminogens only containing nonconventional chromophores such as an aliphatic tertiary amine, [6] amide, [7] nitrile,…”

mentioning

confidence: 99%

Nonconventional Luminescence Enhanced by Silicone‐Induced Aggregation

Feng

2017

Chemistry An Asian Journal

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Nonconventional organic luminogens have attracted ag reat deal of interestso wing to their intriguing properties (e.g.,unusualfluorescence emission) and promising applications. According to previous studies, it was found that introduction of Si-O could enhancet he fluorescence emission of the luminogens. Herein, we have synthesized somefluorescent siloxanederivatives and similar moleculesw ithout Si-O units by simple and efficient modificationt oi nvestigate the role of Si-O units in the emission. It was found that the strong emission could be observed in dilute solutions of siloxane derivatives, but not in the carbon compounds. UV/Vis absorption, fluorescence spectra, nuclear magnetic resonance spectra,a nd theoreticalc alculations indicated that the heteroatom and the Si-Ou nit formed the coordination bond in the siloxane derivatives, resulting in enhanced fluorescencee mission.Recently,o rganic luminogens have rapidlyd eveloped in the fields of organic light-emitting diodes (OLEDs), biological materials, sensors, and drug delivery.[1] However,c onventionalo rganic luminogens have an obvious disadvantage,c oncentration quenching, also called aggregation-caused quenching (ACQ) effect, limiting their applications. To overcome this drawback, one effective strategyi sd eveloping, aggregation-induced emission (AIE) or aggregation-enhanced emission (AEE), which was proposed by Ta ng and co-workersin2 001.[2] Instead of an ACQ effect, AIE luminogens can emit unexpected bright fluorescencei nc oncentrated solutionso re ven in solid states. [3] For example, tetraphenylethene (TPE)-based derivatives, as at ypicalc lass of AIE luminogens,a re non-emissive in molecularly dissolved state buth ighlye missive in aggregated state, because the ACQ effect can be inhibited by the propellershaped structure.[4] Moreover,t heir optical properties can be fine-tuned by modifying the aryl rings with various multiple functional groups.[5] Another effective strategy is developing nonconventional luminogens only containing nonconventional chromophores such as an aliphatic tertiary amine, [6] amide, [7] nitrile,[10] C = C, [11] epoxy, [12] or heteroatoms.[13]Generally,n onconventional luminogens are not composed of traditional aromatic units or constructed by bulky conjugation. Compared to AIE luminogens, these compounds possess specific advantages including facile synthesis, low toxicitya nd biocompatibility,w hich can lead to applicationsi nm aterial science, biology, chemistry and optic materials. Therefore, designing nonconventional luminescentm aterials with improved performance becomes an impending task and has attracted ag reat deal of interest. [8,10, 14] Since the unexpected luminescence from archetypal poly(amidoamine)s (PAMAM) was reported, more and more nonconventional fluorescent polymers have been designed and synthesized. The nonconventional organic luminogens always exist as dendrimers, [15] hyperbranched polymers, [16] or even linear polymers, [17] such as polyurea dendrimers, [9] poly(aminoester)s (PAE), [8]...

show abstract

Strong Blue Photoluminescence and ECL from OH-Terminated PAMAM Dendrimers in the Absence of Gold Nanoparticles

Cited by 373 publications

References 10 publications

Highly Fluorescent Noble-Metal Quantum Dots

Highly Fluorescent Noble-Metal Quantum Dots

Thermal sensitive fluorescent hyperbranched polymer without fluorophores

Nonconventional Luminescence Enhanced by Silicone‐Induced Aggregation

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