Effects of terthiophene as the end-groups in triblock copolymers consisting of poly(fluorene vinylene) and oligo(phenylene vinylene): Time-resolved fluorescence and its anisotropy

Asano, Motoko S.; Yasuda, Yoshifumi; Kagota, Daichi; Haque, Tahmina; Nomura, Kotohiro

doi:10.1016/j.jphotochem.2017.08.039

Cited by 6 publications

(15 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…79 For all three polymers, time dependence of fluorescence signal behaviors can be understood basically with the same model as we reported previously. 81 This argument was supported by the results of time-resolved fluorescence anisotropy measurements (Figure S4-2).…”

Section: Resultsmentioning

confidence: 57%

“…21 More recently, on the basis of time-resolved fluorescence and anisotropy studies, the longer decay component can be ascribed to a species of which π-system of the excited PFV part is expanded over the end group after coplanarization of the terthiophene unit upon excitation. 81…”

Section: Resultsmentioning

confidence: 99%

“…Significantly intense higher vibronic bands relative to the fluorescence (0, 0) band were observed in terthiophene end-modified copolymers as well as block copolymers involving three-repeat phenylenevinylene. 78,81 Time-resolved fluorescence measurements showed that these polymers exhibit time-dependent fluorescence spectra, and the origin of the higher vibronic bands is basically species that undergoes a structural distortion in the excited state. Figure 4 shows time-resolved fluorescence spectra for poly( 1 – 3 ).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Terthiophene Functionalized Conjugated Triarm Polymers Containing Poly(fluorene-2,7-vinylene) Arms Having Different Cores—Synthesis and Their Unique Optical Properties

et al. 2018

Self Cite

View full text Add to dashboard Cite

Optical properties of three types of terthiophene (3T) functionalized conjugated triarm (star-shaped) polymers consisting of poly(9,9-di- n -octyl-fluorene-2,7-vinylene) (PFV) arms and different [2,4,6-tri(biphenyl)benzene (TBP), 1,3,5-tri(benzyl)benzene (TBB), and triphenylamine (TPA)] cores, prepared by combined olefin metathesis with Wittig coupling, have been studied. Relative intensities [increases in the higher vibronic bands, (0, 1) fluorescence (FL)] of the fully conjugated TPA-core polymers, TPA(PFV-3T) 3 , in the fluorescence (FL) spectra in tetrahydrofuran (toluene) solution were higher than those in the other triarm polymers, TBP(PFV-3T) 3 , TBB(PFV-3T) 3 , whereas no significant differences were observed in their UV–vis spectra; notable temperature dependences were not observed in the UV–vis and FL spectra (at −5, 25, and 55 °C). Remarkable differences were not observed in the spectra in these polymer thin films, whereas λ max values red-shifted due to the formation of J -type aggregates. The observation for the time-resolved study well corresponds to results for the steady-state fluorescence measurements. The observed unique emission by the star-shaped (triarm) polymer containing the TPA core would be assumed to be due to a difference in nature of the core (higher coplanarity) compared to that of the others.

show abstract

Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Terthiophene Functionalized Conjugated Triarm Polymers Containing Poly(fluorene-2,7-vinylene) Arms Having Different Cores—Synthesis and Their Unique Optical Properties

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…In general, quantum yields and lifetimes can be expressed as below 49 where k r and k nr are radiative and nonradiative rate constants, respectively. Based on the observed quantum yields and fluorescence lifetimes by using eqs 1 and 2 , values of k r and k nr can be calculated, and the results are presented in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

Star-Shaped ROMP Polymers Coated with Oligothiophenes That Exhibit Unique Emission

et al. 2022

Self Cite

View full text Add to dashboard Cite

A series of oligo(thiophene)-modified “soluble” star-shaped ring-opening metathesis polymerization (ROMP) polymers were prepared by sequential living ROMP of norbornene and a cross-linking agent using a molybdenum-alkylidene catalyst, followed by Wittig-type coupling for termination with oligo(thiophene) carboxaldehydes. The resultant star-shaped ROMP polymers displayed unique emission properties affected by the core size and arm repeat units as well as the kind of oligothiophene coated. The effects of the thiophene groups on photophysical properties of star-shaped/linear polymers were studied via time-resolved fluorescence spectroscopy. Fluorescence lifetimes were determined in THF as 400, 640, 730, and 820 ps for Star 3TPh , Linear 3TPh , Star 4T, and Linear 4T , respectively. A significant enhancement of the nonradiative rate constants k nr in the star-shaped polymers results in relatively lower fluorescence quantum yields and shorter fluorescence lifetimes compared to the corresponding linear polymers.

show abstract

“…In contrast, no significant differences in the spectra were observed with various solvents (THF, chloroform, toluene at 25 °C, Figure b) and temperatures (in THF at −5 – 50 °C), and the excitation wavelengths . Recent time‐resolved fluorescence and anisotropy study revealed that terthiophene (3T) end groups in the PFV undergoes structural change in the excited state; the longer decay component was ascribed to a species of which π‐system of the excited PFV part is expanded over the end group after the co‐planarization upon the excitation …”

Section: Precise Synthesis Of End‐functionalized Conjugated Polymersmentioning

confidence: 99%

Well‐Defined End‐Functionalized Conjugated Polymers/Oligomers Exhibiting Unique Emission Properties through the End Groups: The Exclusive Synthesis by Combined Olefin Metathesis with Wittig‐type Coupling

Nomura

2019

Macro Materials & Eng

Self Cite

View full text Add to dashboard Cite

Acyclic diene metathesis polymerization using ruthenium–carbene catalysts affords defect‐free, high molecular weight poly(arylene vinylene)s containing all trans olefinic double bonds. The exclusive end‐functionalization in the resultant poly(fluorene vinylene)s or poly(phenylene vinylene)s can be attained by treating the vinyl end groups using a molybdenum–alkylidene catalyst/reagent (through olefin metathesis) followed by addition of various aldehydes (Wittig‐type coupling). Some of these end‐modified conjugated materials display unique emission properties, which are different from the original ones, through an interaction (energy transfer or structural change in the excited state) between the conjugated main chain and the end groups [oligo(thiophene)s, F‐BODIPY, etc.]. Exclusive synthesis of well‐defined, all‐trans end‐functionalized oligo(2,5‐dialkoxy‐1,4‐phenylene vinylene)s [(oligo(phenylene vinylene), alkoxy = O(CH2)2OSii Pr3, up to 31 repeat units] is demonstrated by adopting a stepwise synthetic approach (olefin metathesis and the subsequent Wittig‐type cleavage). It is clearly demonstrated that their optical properties (especially the fluorescence spectra including photoluminescence quantum yields) are strongly affected by the end groups as well as the conjugation repeat units.

show abstract

Effects of terthiophene as the end-groups in triblock copolymers consisting of poly(fluorene vinylene) and oligo(phenylene vinylene): Time-resolved fluorescence and its anisotropy

Cited by 6 publications

References 42 publications

Terthiophene Functionalized Conjugated Triarm Polymers Containing Poly(fluorene-2,7-vinylene) Arms Having Different Cores—Synthesis and Their Unique Optical Properties

Terthiophene Functionalized Conjugated Triarm Polymers Containing Poly(fluorene-2,7-vinylene) Arms Having Different Cores—Synthesis and Their Unique Optical Properties

Star-Shaped ROMP Polymers Coated with Oligothiophenes That Exhibit Unique Emission

Well‐Defined End‐Functionalized Conjugated Polymers/Oligomers Exhibiting Unique Emission Properties through the End Groups: The Exclusive Synthesis by Combined Olefin Metathesis with Wittig‐type Coupling

Contact Info

Product

Resources

About