Annealing-Induced Circular Dichroism Enhancement in Luminescent Conjugated Polymers with an Intramolecular Stack Structure

Young Jae Jin; Kyo Un Seo; Young Ghil Choi; Masahiro Teraguchi; Toshiki Aoki; Giseop Kwak

doi:10.1021/acs.macromol.7b01283

Annealing-Induced Circular Dichroism Enhancement in Luminescent Conjugated Polymers with an Intramolecular Stack Structure

Young Jae Jin, Kyo Un Seo, Young Ghil Choi, Masahiro Teraguchi, Toshiki Aoki, Giseop Kwak

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11 Scopus citations

Abstract

Two poly(diphenylacetylene) derivatives containing identical chiral pinanyl groups on the para- and meta-positions of the side phenyl ring were prepared, and their circular dichroism (CD) and photoluminescence (PL) spectra were compared. The magnitudes of circular polarization (g_CD) of the para- and meta-polymers were determined to be 3.1 × 10^-3 and 1.4 × 10^-3, respectively. The PL quantum yield (PLQY) of the para-polymer was much greater (27.8%) than that of the meta-polymer (2.61%). When the two polymers were annealed at 80 °C in toluene, their CD spectra were remarkably enhanced and reached equilibrium at g_CD values of 9.6 × 10^-3 and 6.0 × 10^-3, respectively. The para-polymer was kinetically more favored for the CD enhancement as known from the fact that the activation energies for the reactions of para- and meta-polymers were determined to be 88 and 187 kJ mol^-1, respectively. The PLQYs of both polymers were unaffected by annealing.

Original language	English
Pages (from-to)	6433-6438
Number of pages	6
Journal	Macromolecules
Volume	50
Issue number	17
DOIs	https://doi.org/10.1021/acs.macromol.7b01283
State	Published - 12 Sep 2017

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title = "Annealing-Induced Circular Dichroism Enhancement in Luminescent Conjugated Polymers with an Intramolecular Stack Structure",

abstract = "Two poly(diphenylacetylene) derivatives containing identical chiral pinanyl groups on the para- and meta-positions of the side phenyl ring were prepared, and their circular dichroism (CD) and photoluminescence (PL) spectra were compared. The magnitudes of circular polarization (gCD) of the para- and meta-polymers were determined to be 3.1 × 10-3 and 1.4 × 10-3, respectively. The PL quantum yield (PLQY) of the para-polymer was much greater (27.8%) than that of the meta-polymer (2.61%). When the two polymers were annealed at 80 °C in toluene, their CD spectra were remarkably enhanced and reached equilibrium at gCD values of 9.6 × 10-3 and 6.0 × 10-3, respectively. The para-polymer was kinetically more favored for the CD enhancement as known from the fact that the activation energies for the reactions of para- and meta-polymers were determined to be 88 and 187 kJ mol-1, respectively. The PLQYs of both polymers were unaffected by annealing.",

author = "Jin, {Young Jae} and Seo, {Kyo Un} and Choi, {Young Ghil} and Masahiro Teraguchi and Toshiki Aoki and Giseop Kwak",

note = "Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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doi = "10.1021/acs.macromol.7b01283",

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T1 - Annealing-Induced Circular Dichroism Enhancement in Luminescent Conjugated Polymers with an Intramolecular Stack Structure

AU - Jin, Young Jae

AU - Seo, Kyo Un

AU - Choi, Young Ghil

AU - Teraguchi, Masahiro

AU - Aoki, Toshiki

AU - Kwak, Giseop

PY - 2017/9/12

Y1 - 2017/9/12

N2 - Two poly(diphenylacetylene) derivatives containing identical chiral pinanyl groups on the para- and meta-positions of the side phenyl ring were prepared, and their circular dichroism (CD) and photoluminescence (PL) spectra were compared. The magnitudes of circular polarization (gCD) of the para- and meta-polymers were determined to be 3.1 × 10-3 and 1.4 × 10-3, respectively. The PL quantum yield (PLQY) of the para-polymer was much greater (27.8%) than that of the meta-polymer (2.61%). When the two polymers were annealed at 80 °C in toluene, their CD spectra were remarkably enhanced and reached equilibrium at gCD values of 9.6 × 10-3 and 6.0 × 10-3, respectively. The para-polymer was kinetically more favored for the CD enhancement as known from the fact that the activation energies for the reactions of para- and meta-polymers were determined to be 88 and 187 kJ mol-1, respectively. The PLQYs of both polymers were unaffected by annealing.

AB - Two poly(diphenylacetylene) derivatives containing identical chiral pinanyl groups on the para- and meta-positions of the side phenyl ring were prepared, and their circular dichroism (CD) and photoluminescence (PL) spectra were compared. The magnitudes of circular polarization (gCD) of the para- and meta-polymers were determined to be 3.1 × 10-3 and 1.4 × 10-3, respectively. The PL quantum yield (PLQY) of the para-polymer was much greater (27.8%) than that of the meta-polymer (2.61%). When the two polymers were annealed at 80 °C in toluene, their CD spectra were remarkably enhanced and reached equilibrium at gCD values of 9.6 × 10-3 and 6.0 × 10-3, respectively. The para-polymer was kinetically more favored for the CD enhancement as known from the fact that the activation energies for the reactions of para- and meta-polymers were determined to be 88 and 187 kJ mol-1, respectively. The PLQYs of both polymers were unaffected by annealing.

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U2 - 10.1021/acs.macromol.7b01283

DO - 10.1021/acs.macromol.7b01283

M3 - Article

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SN - 0024-9297

VL - 50

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EP - 6438

JO - Macromolecules

JF - Macromolecules

IS - 17

ER -

Annealing-Induced Circular Dichroism Enhancement in Luminescent Conjugated Polymers with an Intramolecular Stack Structure

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