Light emitting mechanisms in an alternated fluorene EDOT copolymer—A theoretical and photophysical study

Cassemiro, Sandra M.; Zanlorenzi, Cristiano; Atvars, Teresa Dib Zambon; Santos, Gilmar Geraldo dos; Fonseca, Fernando Josepetti; Akcelrud, Leni

doi:10.1016/j.jlumin.2012.07.011

Cited by 7 publications

(9 citation statements)

References 43 publications

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“…In this particular case is noteworthy that EDOT is a much stronger donor than Th and Bz, in relation to fluorene which acts as the acceptor, just the opposite of the two preceding materials. This situation was already discussed in a previous paper [13]. The UV-vis absorption spectrum in diluted CHCl 3 solution of P (FBz) exhibited two major absorption peaks around 320 and 445 nm, attributable to the p-p* transition of the main chain and to the formation of an intrachain charge transfer complex (ICT) between the donor (fluorene) and the acceptor (benzothiadiazole), respectively.…”

Section: Optical Propertiessupporting

confidence: 65%

“…Bromination of 3,4-ethylenedioxythiophene with NBS gave monomer 2,5-dibromo-3,4-ethylenedioxythiophene [13] and 2,7-dibromo-9,9 0 -n-dihexylfluorene was synthesized according to a published procedure [3]. The copolymers were generated via the Suzuki polycondensation using tetrakis(triphenylphosphine) (Pd(PPh 3 ) 4 ) as a catalyst using an equimolecular mixture of the dibromide and of the diboronate.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Interplay among electronic characteristics, morphology and device efficiency in three fluorene alternated copolymers

et al. 2016

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Section: Optical Propertiessupporting

confidence: 65%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Interplay among electronic characteristics, morphology and device efficiency in three fluorene alternated copolymers

et al. 2016

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“…But the most striking feature is the high emission at 451 nm strongly red shifted in relation those of the other polymers. [46,[48][49][50] This spectral behavior is typical of aggregated structures that could be formed as a result of the absence of the bulky DBM substituents (as compared to LaPPS59Nd) and to the possibility of the Nd ion to complex with another phenanthroline unit from a neighboring chain. This would approximate the chains increasing the degree of the 𝜋-stacking, consequently red shifting the emission spectrum.…”

Section: Photophysical Propertiesmentioning

confidence: 91%

Magnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ions

Santana

Turchetti

Zanlorenzi

et al. 2021

Macro Chemistry & Physics

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The magnetic properties of a polyfluorene derivative, {Poly[9,9'-dihexylfluorene-2,7-yl)-3,8-(1,10-phenanthroline)]} and its complexes with neodymium ions are explored and discussed in the light of the macromolecular configuration and photophysical properties. The pristine noncomplexed material is a diamagnetic material, and the introduction of Nd atoms in the polymer leads to a paramagnetic behavior over the entire temperature range. The prominent role of the morphology is demonstrated by comparison of two forms, with different ligands to the metal: one with bulky 𝜷-diketone groups and another with small chorine as ligands. The large groups hinder interchain interaction, whereas the smaller salt forms favored interchain 𝝅-stacking, providing a better interaction of the magnetic field with the polymer backbone, resulting in enhanced magnetic properties. The form with the 𝜷-diketone groups exhibits a paramagnetic behavior whereas the one in the salt form presents ferromagnetic behavior at room temperature. This contribution brings solid confirmation to the importance of interchain interaction in the magnetic properties of conjugated polymers, opening a new way to the obtainment of magnetic conjugated polymers.

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“…2,5‐Dibromo‐3,4‐ethylenedioxythiophene, 2,7‐dibromo‐9,9'‐n‐dihexylfluorene, and the alternated copolymers P(FTh), P(FEDOT), and P(FBz) were prepared according to published procedures, and the characterizations are presented in supporting information . The block copolymers P(FEDOT ‐b‐ FTh) and P(FEDOT ‐b‐ FBz) were synthesized following the procedures described below.…”

Section: Methodsmentioning

confidence: 99%

Photophysical behavior of block copolymers containing EDOT, thiophene, and benzodiathiazole units linked to fluorene

Zanlorenzi

Cassemiro

Grova

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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The spectral properties of two block copolymers were investigated, based on the fluorene‐EDOT (FEDOT) segment linked either to fluorene‐thiophene (FTh) or to fluorene‐benzothiadiazole (FBz) units, in an alternated fashion. Experimental data revealed that in the first material, each block keeps the spectral absorption region observed in the individual copolymers, while in the other structure new spectral characteristics were observed, as compared with each individual segment. In order to elucidate this behavior, theoretical calculations using density functional theory methods were performed. The block copolymers were reduced to a minimal representative model and the following structures were modeled: (FEDOT)2, (FBz)2 e (FTh)2 relative to the alternated segments and (FEDOT)2‐(FBz)2 and (FEDOT)2‐(FTh)2 as miniblocks for the block copolymers. The theoretical results showed good agreement with experimental data and used to interpret the differences in electronic behavior of the block copolymers and their correlation with the observed photophysical behavior. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 908–915

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Light emitting mechanisms in an alternated fluorene EDOT copolymer—A theoretical and photophysical study

Cited by 7 publications

References 43 publications

Interplay among electronic characteristics, morphology and device efficiency in three fluorene alternated copolymers

Interplay among electronic characteristics, morphology and device efficiency in three fluorene alternated copolymers

Magnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ions

Photophysical behavior of block copolymers containing EDOT, thiophene, and benzodiathiazole units linked to fluorene

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