Synthesis and characterization of fluorescent poly[fluorene‐<i>co</i>‐phenylene‐1‐(di‐2‐pyridylamine)] copolymer and its Ru(II) complex

Dinakaran, K.; Chou, Chia-Hung; Hsu, So-Lin; Wei, Kung‐Hwa

doi:10.1002/pola.20317

Cited by 18 publications

(12 citation statements)

References 32 publications

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“…PFs containing covalently attached ''onchain'' dopants avoid phase separation and bleaching problems and seem, therefore, particularly useful and trendsetting. Consequently, a variety of PFs containing phosphorescent metal complexes have been described, including iridium, [182] platinum, [183] europium, [184] rhenium, [185] ruthenium, [186] and osmium, [187] and most of these polymers were prepared either via SPC or the Yamamoto methodology. Langecker and Rehahn, [188] for example analyzed the advantages and limitations of both approaches for precursor routes as well as for direct polymer syntheses where preformed iridium complexes were applied as the monomers (Scheme 13).…”

Section: Pfs Containing Phosphorescent Emittersmentioning

confidence: 99%

Suzuki Polycondensation: Polyarylenes à la Carte

Sakamoto

Rehahn

Wegner

et al. 2009

Macromol. Rapid Commun.

302

241

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This review draws a rather comprehensive picture of how Suzuki polycondensation was discovered in 1989 and how it was subsequently developed into the most powerful polymerization method for polyarylenes during the last 20 years. It combines insights into synthetic issues with classes of polymers prepared and touches upon aspects of this method's technological importance. Because a significant part of the developmental work was carried out in industry, the present review makes reference to an unusually large number of patents.

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Section: Pfs Containing Phosphorescent Emittersmentioning

confidence: 99%

Suzuki Polycondensation: Polyarylenes à la Carte

Sakamoto

Rehahn

Wegner

et al. 2009

Macromol. Rapid Commun.

302

241

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“…Typical intensity-normalized absorption and emission spectra, measured for solutions of PFX in THF and in water dispersions are shown in Figure b. PFX in THF exhibited an absorption spectrum (dashed black line) from 300 to 420 nm with a maximum at 350 nm, which is attributed to π–π* transition from the highest occupied molecular orbital (HOMO) to the first excited lowest unoccupied molecular orbital (LUMO) level in the fluorine-benzene polymeric backbones similar to poly(fluorene- alt -phenylene) absorption spectra − and PFO- co -PX in the literature . Compared with PFX in THF, the absorption spectrum of PFX NPs (solid black lines) exhibited similar behavior without any absorption peak shift observed but a low energy tail appears due to light scattering from NPs in suspension.…”

Section: Resultsmentioning

confidence: 89%

Photophysical Probing of Dye Microenvironment, Diffusion Dynamics, and Energy Transfer

2018

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The objective of this work was to apply an organic dye, tetraphenylporphrin (TPP), to probe the aggregation state, microviscosity, and diffusion dynamics of dye molecules within the interior microenvironment of conjugated polymer poly [(9,9dioctylfluorenyl-2,7-diyl)-co-(2,5-p-xylene)] nanoparticles (PFX NPs) which should open up further prospects in designing new porphyrin based nanoparticle materials and improve the knowledge of the better design of the nanophotonic devices based on dye-doped polymer NPs. This designed, aggregation-free TPP-doped PFX NPs system, exhibited remarkably high Forster resonance energy transfer (FRET) efficiency, leading to a potential application as a light harvesting system or a loadable drug carrier. To this end, different concentrations of TPP were doped into PFX NPs, prepared using a reprecipitation method. To compare TPP in organic solvent with TPP within the NP microenvironment, a successful doping of TPP into PFX NPs and no TPP aggregation formed inside of the NPs were indicated. Diffusion dynamics, location and degree of freedom of TPP in the PFX NPs were investigated using time-resolved anisotropy measurements fit with a "wobbling-in-cone and lateral diffusion" model. TPP molecules were found to wobble inside the core of NPs at a semiangle of ca. 70°and laterally diffuse on the NP surface with a diffusion coefficient of ca. 10 −4 cm 2 s −1 . The microviscosity of the nanoparticles was calculated from the wobbling model as 0.9−1.2 cP which is higher than the viscosity of THF (0.48 cP). By increasing the concentration of TPP from 0 to 5 wt %, the emission color could be gradually tuned from violet to red. Stern−Volmer analysis indicates that a single TPP molecule can quench 12 PFX polymer chains, and at 5 wt % TPP, PFX emission was almost completely quenched. The emission intensity of TPP in PFX NPs is 70 times higher than in organic solvent with the excitation wavelength at 350 nm which highlights the excellent sensitization properties of this system. The combined energy diffusion and Forster energy transfer model was used to simulate the relationship of nanoparticle sizes and the energy transfer efficiency. Both of the simulation and experimental results indicate that in this system, the FRET efficiency increases with the dye density increasing and they increase gradually for small particles range of 5−20 nm, approaching constant value for particle radii above 30 nm. The exciton diffusion length was estimated as 6.5 nm.

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“…PFs containing covalently attached “on‐chain” dopants avoid phase separation and bleaching problems and seem, therefore, particularly useful and trendsetting. Consequently, a variety of PFs containing phosphorescent metal complexes have been described, including iridium,182 platinum,183 europium,184 rhenium,185 ruthenium,186 and osmium,187 and most of these polymers were prepared either via SPC or the Yamamoto methodology. Langecker and Rehahn,188 for example analyzed the advantages and limitations of both approaches for precursor routes as well as for direct polymer syntheses where pre‐formed iridium complexes were applied as the monomers (Scheme ).…”

Section: Selected Classes Of Polyarylenes and Related Polymersmentioning

confidence: 99%

Rubredoxin reductase from Alcanivorax borkumensis: Expression and characterization

Teimoori¹,

Ahmadian²,

Madadkar-Sobhani³

et al. 2011

Biotechnology Progress

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Oil pollution is an environmental problem of increasing importance. Alcanivorax borkumensis, with a high potential for biotechnological applications, is a key marine hydrocarbonoclastic bacterium and plays a critical role in the bioremediation of oil-polluted marine systems. In oil degrading bacteria, the first step of alkane degradation is catalyzed by a monooxygenase. The reducing electrons are tunneled from NAD(P)H via rubredoxin, one of the most primitive metalloproteins, to the hydroxylase. Rubredoxin reductase is a flavoprotein catalyzing the reduction of rubredoxin. There are two rubredoxin genes, alkG and rubA, in A. borkumensis genome. In this work, the genes encoding rubredoxin reductase (ABO_0162, rubB) and AlkG(ABO_2708, alkG) were cloned and functionally overexpressed in E. coli. Our results demonstrate that RubB could reduce AlkG, therefore compensating for the absence of AlkT, also a rubredoxin reductase, missing in A. borkumensis SK2 genome. These results will increase our knowledge concerning biological alkane degradation and will lead us to design more efficient biotransformation and bioremediation systems.

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Synthesis and characterization of fluorescent poly[fluorene‐co‐phenylene‐1‐(di‐2‐pyridylamine)] copolymer and its Ru(II) complex

Cited by 18 publications

References 32 publications

Suzuki Polycondensation: Polyarylenes à la Carte

Suzuki Polycondensation: Polyarylenes à la Carte

Photophysical Probing of Dye Microenvironment, Diffusion Dynamics, and Energy Transfer

Rubredoxin reductase from Alcanivorax borkumensis: Expression and characterization

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