<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Two well defined, blue luminescent homopolymers containing 9,9-diethylfluorene core with electron withdrawing pendant pyridine, Suzuki-coupled with the corresponding borolane of decoxy phenyl (PFPA) and naphthalene (PFNA) have been designed and synthesized efficiently. The obtained rod-coil polymers have the average molecular weight of 15212 (PFPA) and 15130 (PFNA) with polydispersity indices (PDIs) 1.07 and 1.3, respectively. The polymers have good solubility and high thermal stability with the decomposition temperature of 362 °C (PFPA) and 367 °C (PFNA) correspondingly. Furthermore the optical and electrochemical properties of the polymers have been investigated. The polymers exhibited photoluminescence (PL) maxima at 410 nm (PFPA) and 414 nm (PFNA) excited at 340 nm, as stable blue luminescence polymers at low concentration of 10<sup>−6</sup> M with a quantum yield of 0.64 and 0.62, respectively. In addition the annealed (150 °C) polymer films showed better stability of its photoluminescence spectra. Absorbance and fluorescence emission spectra of PFPA and PFNA were compared in order to evaluate the effects of substituent, phenyl and naphthalene in pyridine pendant fluorene moieties.</p></abstract>

Two well defined, blue luminescent homopolymers containing 9,9-diethylfluorene core with electron withdrawing pendant pyridine, Suzuki-coupled with the corresponding borolane of decoxy phenyl (PFPA) and naphthalene (PFNA) have been designed and synthesized efficiently. The obtained rod-coil polymers have the average molecular weight of 15212 (PFPA) and 15130 (PFNA) with polydispersity indices (PDIs) 1.07 and 1.3, respectively. The polymers have good solubility and high thermal stability with the decomposition temperature of 362 °C (PFPA) and 367 °C (PFNA) correspondingly. Furthermore the optical and electrochemical properties of the polymers have been investigated. The polymers exhibited photoluminescence (PL) maxima at 410 nm (PFPA) and 414 nm (PFNA) excited at 340 nm, as stable blue luminescence polymers at low concentration of 10−6 M with a quantum yield of 0.64 and 0.62, respectively. In addition the annealed (150 °C) polymer films showed better stability of its photoluminescence spectra. Absorbance and fluorescence emission spectra of PFPA and PFNA were compared in order to evaluate the effects of substituent, phenyl and naphthalene in pyridine pendant fluorene moieties.

Synthesis and electro-optical properties of fluorene containing blue luminescent rod-coil homopolymers with pendant pyridine

Materials Science-Poland

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Two well defined, blue luminescent homopolymers containing 9,9-diethylfluorene core with electron withdrawing pendant pyridine, Suzuki-coupled with the...

Polymer	M_n	M_w	PDI	T_d [°C] Temperature of 5 % weight loss
PFPA	14215	15212	1.07	352
PFNA	13349	15130	1.13	359

Polymer	Soluition		Film		E_ox/onset	HOMO	E_g	LUMO
Polymer
	λ_max (abs in nm)	λ_max (PL in nm)	λ_max (abs in nm)	λ_max (PL in nm)	[V] Onset oxidation and reduction potentials measured by cyclic voltammetry in solid films	[eV] HOMO = [−(E_onset − 0.45) − 4.8] eV, where 0.45 V is the value for ferrocene versus Ag/Ag⁺ and 4.8 eV is the energy level of ferrocene below the vacuum	[eV]	[eV] LUMO has been calculated from optical band gap
PFPA	335	404	342	410	0.96	−5.31	3.09	−2.22
PFNA	339	407	346	414	0.93	−5.28	3.10	−2.18

Synthesis and electro-optical properties of fluorene containing blue luminescent rod-coil homopolymers with pendant pyridine

Publié en ligne: 24 févr. 2017

Pages: 217 - 224

Reçu: 08 mars 2016

Accepté: 25 janv. 2017

DOI: https://doi.org/10.1515/msp-2017-0034

Mots clés
radical polymerization, blue luminescence, rod-coil homopolymer, fluorene, electro-optical properties

© 2017 Duryodhan Sahu, Subhendu Chakroborty

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Molecular weight and thermal properties of PFPA and PFNA.

Optical and Electrochemical properties.

Synthesis and electro-optical properties of fluorene containing blue luminescent rod-coil homopolymers with pendant pyridine

Publié en ligne: 24 févr. 2017

Pages: 217 - 224

Reçu: 08 mars 2016

Accepté: 25 janv. 2017

DOI: https://doi.org/10.1515/msp-2017-0034

Mots clésradical polymerization, blue luminescence, rod-coil homopolymer, fluorene, electro-optical properties

© 2017 Duryodhan Sahu, Subhendu Chakroborty

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Molecular weight and thermal properties of PFPA and PFNA.

Optical and Electrochemical properties.

Mots clés
radical polymerization, blue luminescence, rod-coil homopolymer, fluorene, electro-optical properties