Fluorescent dyes as model ‘hydrophobic modifiers’ of polyelectrolytes: a study of poly(acrylic acid)s labelled with pyrenyl and naphthyl groups

Anghel, Dan F.; Alderson, Valerie; Winnik, Françoise M.; Mizusaki, Masanobu; Morishima, Yotaro

doi:10.1016/s0032-3861(97)10126-4

Cited by 93 publications

(166 citation statements)

References 13 publications

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“…Second, optical microscopy reveals that this return to green fluorescence is accompanied by the development of large dye aggregates in the blends (see Supporting Information). Increased self-quenching of excimer emission due to the formation of large aggregates has previously been found to cause increases in the ratio of monomer to excimer emission, [57][58][59][60][61] and a similar self-quenching effect in the large aggregates (which are only developed at temperatures well above T g ) appears to be responsible for the green color developed in the blends investigated here. The use of simple arrays comprising blends of different T g allows one to create sensor systems that provide an accurate account of thermal history within a selected temperature range (Figure 7).…”

Section: Polymer T Gsupporting

confidence: 63%

Threshold Temperature Sensors with Tunable Properties

Crenshaw

Kunzelman

Sing

et al. 2007

Macro Chemistry & Physics

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Thermochromic polymer/dye blends based on small amounts (0.6–2.3 wt.‐%) of chromogenic sensor dyes and glassy amorphous polymers were prepared. Subjecting melt‐processed, quenched blends to temperatures above Tg leads to permanent and pronounced changes of their absorption and fluorescence spectra as a result of phase separation and assembly of dye aggregates. The influence of dye structure and polymer Tg on the aggregation kinetics of these blends was investigated. It is shown that increasing the length of the dye's rigid core leads to slower aggregation rates due to limited mobility in the polymer. The threshold of the color change can be tailored by adjusting the polymer Tg, as was shown by the systematic investigation of blends based on poly(alkyl methacrylate) copolymers of varying composition.magnified image

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Section: Polymer T Gsupporting

confidence: 63%

Threshold Temperature Sensors with Tunable Properties

Crenshaw

Kunzelman

Sing

et al. 2007

Macro Chemistry & Physics

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“…These tendencies could be quantified by monitoring the monomer to aggregate/excimer intensity ratio I M /I E [37][38] at different temperatures (Table 1).…”

Section: Hna-skeleton Probes (A 1 *)mentioning

confidence: 99%

Detection of RNA Hybridization by Pyrene‐Labeled Probes

et al. 2009

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Powerful pyrene probes: Two kinds of pyrene-labeled oligonucleotides (HNA- and RNA-skeleton probes) were explored. The enhanced fluorescence intensity in the monomer region and the disappearance of aggregate/excimer emission in duplexes has been successfully used to detect the hybridization of oligonucleotides. By covalently attaching pyrene chromophores with different linkers onto altritol nucleotides or ribonucleotides, and by varying the number of these pyrene modified altritol nucleotides and ribonucleotides in HNA (hexitol nucleic acid) and RNA, respectively, we have explored the general applicability of pyrene absorbance and especially fluorescence as a probe to monitor RNA hybridization. The results reveal that the backbone of the probes, the number of pyrene units attached and the nature of the tether can all substantially affect the absorbance and fluorescence properties of the probes both in single strand and double strand form. Moreover, the strength of hybridization is also affected. The disappearance of pyrene aggregate/excimer emission and simultaneous increase in monomer emission intensity of the multipyrene-labeled probes has been successfully used to monitor the hybridization of oligonucleotides, including a hairpin structure. Differences in optical response between the HNA- and RNA-skeleton probes upon hybridization indicate that the interaction of pyrene with the nucleobases in both types of duplexes is different.

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“…2,12,19,20 Fischer-Scientific. Two ethylene-propylene copolymers were supplied by Afton Chemical Corporation.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Level of Intermacromolecular Interactions in Ethylene–Propylene Copolymers by Using Pyrene Excimer Formation

Pirouz

Duhamel

Sheng³

et al. 2015

Macromolecules

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A unique methodology based on fluorescence measurements is introduced to quantitatively measure the actual level of interpolymeric association between ethylene-propylene (EP) copolymers used as viscosity index improvers (VIIs) in engine oils. To this end, two EP copolymers, one amorphous (EP(AM)) and the other semicrystalline (EP(SM)), were maleated and then fluorescently labeled with 1-pyrenemethylamine and 2-(2-naphthyl)ethylamine to yield increased upon decreasing the temperature and increasing the polymer concentration as would have been expected from such a polymer. This result suggests that pyrene excimer formation provides a reliable method to quantitatively determine finter for EP copolymers used as VIIs, an information which is otherwise difficult to extract from standard FRET experiments.2

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Fluorescent dyes as model ‘hydrophobic modifiers’ of polyelectrolytes: a study of poly(acrylic acid)s labelled with pyrenyl and naphthyl groups

Cited by 93 publications

References 13 publications

Threshold Temperature Sensors with Tunable Properties

Threshold Temperature Sensors with Tunable Properties

Detection of RNA Hybridization by Pyrene‐Labeled Probes

Quantifying the Level of Intermacromolecular Interactions in Ethylene–Propylene Copolymers by Using Pyrene Excimer Formation

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