β-Phase Formation of Poly(9,9-dioctylfluorene) Induced by Liposome Phospholipid Bilayers

Tapia, María J.; Monteserín, María; Melo, J. Sérgio Seixas de; Pina, João; Castro, Ricardo A. E.; Garcia, Sònia; Estelrich, Joan

doi:10.1021/jp2010666

Cited by 22 publications

(37 citation statements)

References 33 publications

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“…[12] Several studies have been reported, including mixing of polyfluorenes with different emissive materials and applying them in single or multiple layers. [13,14] We also know that many polyfluorenes form there own distinct phases in films, commonly known as the beta phase, [15,16,17] thus it is a ideal component of a blend to study. Polythiophenes and their regioregular forms are another class of well-known semiconductor polymers known to show complex morphology and morphological controlled pho-2 tophysics, where side chain structure and quality of solvent/environment also plays a significant role in their photophysical properties.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of different poly3hexylthiophene chain environments in a polyfluorene matrix

Santos

Cury

Dias

et al. 2016

Journal of Luminescence

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractOptical properties of blends made of Poly(9,9-dioctyl-fluorene-2,7-diyl) (PFO) and Poly(3-hexylthiophene-2,5-diyl) (P3HT) were investigated and compared to those of Poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) by steady state optical spectroscopy. In addition to the individual emissions of PFO and P3HT chromophores, the blends composed by these two polymers show a new peak emission around 590 nm. The new peak is attributed to well dissolved, "isolated", P3HT chains dispersed into the PFO matrix. It was observed that the well dissolved P3HT chains are activated by Förster energy transfer, where PFO and P3HT molecules act as donor and acceptor, respectively. Further, emission from ordered aggregates of P3HT are clearly observed and the interplay between aggregate and isolate P3HT chains was studied. In contrast to the PFO:P3HT blends, the emission spectra from F8T2 co-polymer shows clear interaction in the ground state between the dioctylfluorene and bithiophene monomer-units, giving rise to a wholly new chromophore conformation on the backbone.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of different poly3hexylthiophene chain environments in a polyfluorene matrix

Santos

Cury

Dias

et al. 2016

Journal of Luminescence

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“…The analysis of the diverse types of the interaction involved between DMPC and drugs can be performed by differential scanning calorimetry (DSC), a technique widely employed in several studies, because the thermodynamic properties and technical parameters can be accurately and easily monitored. The procedure for the formation of liposomes is relativity simple and allows to use phospholipids of several types as biomembrane models.…”

Section: Introductionmentioning

confidence: 99%

Anomalous interaction of tri-acyl ester derivatives of uridine nucleoside with al-α-dimyristoylphosphatidylcholine biomembrane model: a differential scanning calorimetry study

Escobar

Fernández

Giordani

et al. 2018

Journal of Pharmacy and Pharmacology

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Objectives Uridine was conjugated with fatty acids to improve the drug lipophilicity and the interaction with phospholipid bilayers. Methods The esterification reaction using carbodiimides compounds as coupling agents and a nucleophilic catalyst allowed us to synthesize tri‐acyl ester derivatives of uridine with fatty acids. Analysis of molecular interactions between these tri‐acyl ester derivatives and l‐α‐dimyristoylphosphatidylcholine (DMPC) multilamellar vesicles (MLV) – as a mammalian cell membrane model – have been performed by differential scanning calorimetry (DSC). Key findings The DSC thermograms suggest that nucleoside and uridine triacetate softly interact with phospholipidic multilamellar vesicles which are predominantly located between the polar phase, whereas the tri‐acyl ester derivatives with fatty acids (myristic and stearic acids) present a strongly interaction with the DMPC bilayer due to the nucleoside and aliphatic chains parts which are oriented towards the polar and lipophilic phases of the phospholipidic bilayer, respectively. However, the effects caused by the tri‐myristoyl uridine and tri‐stearoyl uridine are different. Conclusions We show how the structural changes of uridine modulate the calorimetric behaviour of DMPC shedding light on their affinity with the phospholipidic biomembrane model.

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“…18,19 The mechanism of the formation of the β-phase structure is poorly understood, but it has been found in both films and in solution. 20,21 There is also a third contribution to the emission spectra, a broad emission between 500 and 550 nm. This emission is attributed to either a charge transfer state of F8 or to photo-oxidized F8 keto-states.…”

Section: Introductionmentioning

confidence: 99%

“…This emission is attributed to either a charge transfer state of F8 or to photo-oxidized F8 keto-states. [18][19][20][21][22][23][24][25] Finally, UV/VIS absorption spectroscopy was used to quantify the presence of the α-and β-phases by a method proposed by Cone et al 24 …”

Section: Introductionmentioning

confidence: 99%

Comparing morphology in dip-coated and spin-coated polyfluorene:fullerene films

et al. 2016

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When preparing the active layer film for organic optoelectronic devices, e.g., solar cells, spin-coating is often used for the deposition of the solution of electron donor and acceptor molecules. An alternative, among others, is to use dipcoating, where the substrate is dipped into the solution and subsequently withdrawn, all at coordinated speeds and times. In order to develop knowledge on how the final active layer morphology is influenced by preparation parameters, different coating methods are compared. In this contribution, we report on a comparative study of thin deposited films from a model system. The investigated model system is poly(9,9-dioctylfluorene) (F8, also referred to as PFO) as donor and [6,6]-phenyl-C 61 -butyric acid methyl ester (PC 60 BM) as acceptor. Combining fluorescence and absorption spectroscopy with atomic force microscopy allows us to conclude that dipcoating offers increased possibilities to manipulate the film morphology, that the transition of the glassy F8 α-phase to the more ordered β-phase is influenced by the dipping speed as well as by the blend ratio, and that the long-wavelength emission of F8 cannot stem from the oxidized keto-F8 only.

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β-Phase Formation of Poly(9,9-dioctylfluorene) Induced by Liposome Phospholipid Bilayers

Cited by 22 publications

References 33 publications

Spectroscopic studies of different poly3hexylthiophene chain environments in a polyfluorene matrix

Spectroscopic studies of different poly3hexylthiophene chain environments in a polyfluorene matrix

Anomalous interaction of tri-acyl ester derivatives of uridine nucleoside with al-α-dimyristoylphosphatidylcholine biomembrane model: a differential scanning calorimetry study

Comparing morphology in dip-coated and spin-coated polyfluorene:fullerene films

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