Preparation of Poly(silylene-<i>p</i>-phenylene)s Bearing a Benzo Crown Pendant Group and Their Iono- and Solvatochromic Behavior in the Emission Spectra

Ohshita, Joji; Uemura, Taisuke; Inoue, Takahiro; Hino, and Koichi; Kunai, Atsutaka

doi:10.1021/om0506015

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…An extensive range of - conjugated copolymers with an alternating arrangement of an organosilicon unit and a -conjugated unit such as ethenylene [1], ethynylene [2][3][4][5][6], phenylene [7][8][9][10][11], and thienylene [12][13][14][15] have been synthesized. These - conjugated materials display conductivities in the range 10 5 -10 0 S cm 1 after being doped with strong electron acceptors such as SbF 5 and AsF 5 [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Charge doping effect on σ-π conjugated copolymers

et al. 2011

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The charge-doping effect on the geometric and the electronic structures of organosilicon oligomers nSi x (C=C) y + has been studied using density functional theory. Charge-doping can significantly lower the excitation energies. Interchain hole hopping mainly occurs between the -conjugated units. A doped nSi x (C=C) y + oligomer can undergo a structural rearrangement. The simulated UV/vis absorption peak of the rearranged structure is located at higher energy than the non-rearranged one. The hole transfer rate is significantly decreased if a doped molecule undergoes a rearrangement. These results offer a basis to explain previously observed experimental phenomena.

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Section: Introductionmentioning

confidence: 99%

Charge doping effect on σ-π conjugated copolymers

et al. 2011

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“…The π‐conjugated polymers are also applicable to some kinds of sensors, such as ion sensor, bio molecules sensor, etc 2–31. Some conjugated polymers having crown ether groups have been developed for the chemosensor of metal ions 2–9. The crown ether groups of the polymers capture the metal ions, and the captured ions would induce the change of photophysical properties of the polymers.…”

Section: Introductionmentioning

confidence: 99%

Miscibility of styrene/unsaturated polyester quasibinary systems: Unsaturated polyester chemical composition and molecular weight influence

Buffa

Borrajo

2006

J of Applied Polymer Sci

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Unsaturated polyester prepolymers were synthesized with different chemical compositions and molecular weights. Cloud-point curves (CPC) were measured in St-UP quasibinary solutions, showing UCST behavior in all cases. The miscibility of the first UP samples series in St comonomer was enhanced when AA chemical comonomer concentration in UP prepolymer increased. In the second series, UP prepolymer miscibility increased with the molecular weight up to a maximum and, after that, the miscibility decreased. A thermodynamic analysis of experimental CPCs was performed using the Flory-Huggins (F-H) theory for polydisperse polymer solutions. A simple relationship between the interaction parameter and the temperature inverse could fit the measured CPCs in wide concentrations and molecular weight ranges. In the temperature interval where this fit took place, the positive enthalpic contribution to the interaction parameters determined the miscibility dependence with temperature in both UP sample series. The St-UP miscibility behavior was also correlated with UPs structural chemical parameters as: (a) the final HOÀ À and HOOCÀ À high polar groups concentration, (b) the chain backbone polar adipate and phthalate groups concentration, and (c) the UP size dependent mixing entropy. All these parameters are molecular weight dependent.

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Synthesis and chemosensing behavior of fluorene‐based alternating copolymers containing ether side chains and Si–vinylene units in the main chain

Naga

Ohkura

Tagaya

et al. 2011

J. Polym. Sci. A Polym. Chem.

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Alternating copolymerization of 9,9‐bis(3,6,9‐trioxadecyl)‐2,7‐dibromofluorene (ODFl) or 9,9‐bis(3,6‐dioxaheptyl)‐2,7‐dibromofluorene with Si containing divinyl compounds, divinyldiphenylsilane (VPS), or divinyldimethylsilane (VMS) is investigated using the Mizoroki–Heck reaction with palladium(II) acetate. The corresponding alternating copolymer is obtained in the copolymerization of ODFl with VPS. The copolymerization of ODFl with VMS yields low molecular weight oligomers. Optical properties of the ODFl–VPS copolymer have been investigated with UV–vis absorption and photoluminescence (PL) spectroscopy. The ODFl–VPS copolymer shows absorption peaks due to π–π* transition and intramolecular charge transfer through σ–π moiety at around 330 and 360–400 nm, respectively. An emission peak is observed at 450 nm in the PL spectrum of the ODFl–VPS copolymer, and the PL quantum yield is 0.19. The PL spectroscopy of ODFl–VPS copolymer is investigated in the presence of Li+, Na+, and K+, and the intensity of emission peak is decreased by those metal cations, especially by Na+. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011.

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Preparation of Poly(silylene-p-phenylene)s Bearing a Benzo Crown Pendant Group and Their Iono- and Solvatochromic Behavior in the Emission Spectra

Cited by 12 publications

References 21 publications

Charge doping effect on σ-π conjugated copolymers

Charge doping effect on σ-π conjugated copolymers

Miscibility of styrene/unsaturated polyester quasibinary systems: Unsaturated polyester chemical composition and molecular weight influence

Synthesis and chemosensing behavior of fluorene‐based alternating copolymers containing ether side chains and Si–vinylene units in the main chain

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