New symmetrical pi-conjugated molecules having large third-order optical nonlinearities

Kurihara, Takashi; Oba, Naoki; Mori, Yojiro; Tomaru, Satoru; Kaino, Toshikuni

doi:10.1063/1.350306

Cited by 23 publications

(4 citation statements)

References 12 publications

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“…The vibronic structure of SBAC is coupled with the electronic transition only when its molecular planarity is relatively high. 29 The structure observed in the spectrum of the /3-carotene solution indicates that /3-carotene can have a relatively high planarity even in DMF. This is supported by the spectra for /3-ionone and retinal, belonging to the /8-carotene series, which show a clearer vibronic structure under a high molecular planarity.31 This high molecular planarity of the /3-carotene series in DMF provided a linear «2 [THG] increase to a conjugated length of at least 20 Á, which is the conjugated length of /3-carotene.…”

Section: Resultsmentioning

confidence: 99%

Molecular-length dependence of third-order nonlinear optical properties in conjugated organic materials

Kanbara¹,

Kobayashi²,

Kaino³

et al. 1994

J. Phys. Chem.

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Molecular-length dependence of the third-order nonlinear optical properties in conjugated organic materials is systematically investigated by third-harmonic generation measurement and optical Ken; shutter measurement.The molecular length represents a very important factor in the third-order nonlinear optical properties. The third-harmonic generation measurement shows that the nonlinear refractive index related to the electronic polarization effect increases in proportion to the powers of a conjugated length or an absorption edge. The optical Kerr shutter measurement indicates that the application of longer molecules causes the nonlinearity of the solution medium to be dominated by the electronic polarization effect, reducing the contribution of the molecular orientation effect.

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Section: Resultsmentioning

confidence: 99%

Molecular-length dependence of third-order nonlinear optical properties in conjugated organic materials

Kanbara¹,

Kobayashi²,

Kaino³

et al. 1994

J. Phys. Chem.

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“…The effect of the π-conjugated bonding on electron transfer has also been previously reported. [26][27][28] In terms of the physical entrapment effect associated with GOx concentration, according to the enzyme activity data (Fig. 1), it is initially expected that the amount of GOx molecules immobilized will increase with an increase in GOx concentration.…”

Section: Evaluation Of the Bond Formation In The Enzymatic Catalystsmentioning

confidence: 99%

“…37) and the GA/[GOx/PANI/CNT] multilayer (Pt-C cathode) was 0.30 mW cm −2 . 27 Furthermore, the half and full cell EIS measurements were carried out to correlate the EBC performance and catalytic activity. The R ct s and R s s of the EBCs using the catalysts evaluated in Fig.…”

Section: Performance Of Ebcs Using Enzyme Catalystsmentioning

confidence: 99%

Development of a glucose oxidase-based biocatalyst adopting both physical entrapment and crosslinking, and its use in biofuel cells

et al. 2016

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New enzymatic catalysts prepared using physical entrapment and chemical bonding were used as anodic catalysts to enhance the performance of enzymatic biofuel cells (EBCs). For estimating the physical entrapment effect, the best glucose oxidase (GOx) concentration immobilized on polyethyleneimine (PEI) and carbon nanotube (CNT) (GOx/PEI/CNT) was determined, while for inspecting the chemical bonding effect, terephthalaldehyde (TPA) and glutaraldehyde (GA) crosslinkers were employed. According to the enzyme activity and XPS measurements, when the GOx concentration is 4 mg mL(-1), they are most effectively immobilized (via the physical entrapment effect) and TPA-crosslinked GOx/PEI/CNT(TPA/[GOx/PEI/CNT]) forms π conjugated bonds via chemical bonding, inducing the promotion of electron transfer by delocalization of electrons. Due to the optimized GOx concentration and π conjugated bonds, TPA/[GOx/PEI/CNT], including 4 mg mL(-1) GOx displays a high electron transfer rate, followed by excellent catalytic activity and EBC performance.

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“…The positive impact of the π-conjugated bond on the electron transfer was already reported in other references. [24][25][26][27] To check whether the bond formations hypothesized in Fig. 2 are appropriate, FTIR measurements are performed using a GOx/PEI/CNT structure that is cross-linked with GA The result is presented in Fig.…”

Section: Evaluation Of Chemical Structurementioning

confidence: 99%

Fabrication of a biofuel cell improved by the π-conjugated electron pathway effect induced from a new enzyme catalyst employing terephthalaldehyde

2016

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A model explaining the π-conjugated electron pathway effect induced by a novel cross-linker adopted enzyme catalyst is suggested and the performance and stability of an enzymatic biofuel cell (EBC) adopting the new catalyst are evaluated. For this purpose, new terephthalaldehyde (TPA) and conventional glutaraldehyde (GA) cross-linkers are adopted on a glucose oxidase (GOx), polyethyleneimine (PEI) and carbon nanotube (CNT)(GOx/PEI/CNT) structure. GOx/PEI/CNT cross-linked by TPA (TPA/[GOx/PEI/CNT]) results in a superior EBC performance and stability to other catalysts. It is attributed to the π bonds conjugated between the aldehyde of TPA and amine of the GOx/PEI molecules. By π conjugation, electrons bonded with carbon and nitrogen are delocalized, promoting the electron transfer and catalytic activity with an excellent EBC performance. The maximum power density (MPD) of an EBC adopting TPA/[GOx/PEI/CNT] (0.66 mW cm(-2)) is far better than that of the other EBCs (the MPD of EBC adopting GOx/PEI/CNT is 0.40 mW cm(-2)). Regarding stability, the covalent bonding formed between TPA and GOx/PEI plays a critical role in preventing the denaturation of GOx molecules, leading to an excellent stability. By repeated measurements of the catalytic activity, TPA/[GOx/PEI/CNT] maintains its activity to 92% of its initial value even after five weeks.

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New symmetrical pi-conjugated molecules having large third-order optical nonlinearities

Abstract: The third-order optical nonlinearities of carbon nanotube modified conjugated polymer in the femtosecond and nanosecond regimes Two-dimensionally conjugated molecules: The importance of low molecular symmetry for large third-order nonlinear optical effects

Cited by 23 publications

References 12 publications

Molecular-length dependence of third-order nonlinear optical properties in conjugated organic materials

Molecular-length dependence of third-order nonlinear optical properties in conjugated organic materials

Development of a glucose oxidase-based biocatalyst adopting both physical entrapment and crosslinking, and its use in biofuel cells

Fabrication of a biofuel cell improved by the π-conjugated electron pathway effect induced from a new enzyme catalyst employing terephthalaldehyde

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