The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Takashi Kato - One of the best experts on this subject based on the ideXlab platform.
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Full-color tunable photoluminescent ionic liquid crystals based on tripodal pyridinium, Pyrimidinium, and quinolinium Salts.
Journal of the American Chemical Society, 2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C(3)-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λ(em) = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV-vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields.
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Full-Color Tunable Photoluminescent Ionic Liquid Crystals Based on Tripodal Pyridinium, Pyrimidinium, and Quinolinium Salts
2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C3-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λem = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV–vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields
Kana Tanabe - One of the best experts on this subject based on the ideXlab platform.
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Full-color tunable photoluminescent ionic liquid crystals based on tripodal pyridinium, Pyrimidinium, and quinolinium Salts.
Journal of the American Chemical Society, 2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C(3)-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λ(em) = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV-vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields.
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Full-Color Tunable Photoluminescent Ionic Liquid Crystals Based on Tripodal Pyridinium, Pyrimidinium, and Quinolinium Salts
2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C3-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λem = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV–vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields
Yuko Suzui - One of the best experts on this subject based on the ideXlab platform.
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Full-color tunable photoluminescent ionic liquid crystals based on tripodal pyridinium, Pyrimidinium, and quinolinium Salts.
Journal of the American Chemical Society, 2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C(3)-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λ(em) = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV-vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields.
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Full-Color Tunable Photoluminescent Ionic Liquid Crystals Based on Tripodal Pyridinium, Pyrimidinium, and Quinolinium Salts
2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C3-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λem = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV–vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields
Miki Hasegawa - One of the best experts on this subject based on the ideXlab platform.
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Full-color tunable photoluminescent ionic liquid crystals based on tripodal pyridinium, Pyrimidinium, and quinolinium Salts.
Journal of the American Chemical Society, 2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C(3)-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λ(em) = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV-vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields.
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Full-Color Tunable Photoluminescent Ionic Liquid Crystals Based on Tripodal Pyridinium, Pyrimidinium, and Quinolinium Salts
2012Co-Authors: Kana Tanabe, Yuko Suzui, Miki Hasegawa, Takashi KatoAbstract:Color-tunable luminescent ionic liquid crystals have been designed as a new series of luminescent materials. To achieve tuning of emission colors, intramolecular charge transfer (ICT) character has been incorporated into tripodal molecules. A series of the compounds has three chromophores in each molecule, incorporated with both electron-donating moieties such as alkylaminobenzene and alkoxybenzene, and electron-accepting moieties such as pyridinium, Pyrimidinium, and quinolinium parts. These C3-symmetrical molecules self-assemble into liquid-crystalline (LC) columnar (Col) structures over wide temperature ranges through nanosegregation between ionic moieties and nonionic aliphatic chains. Photoluminescent (PL) emissions of these tripodal molecules are observed in the visible region both in the self-assembled condensed states and in solutions. For example, a Pyrimidinium Salt with didodecylaminobenzene moieties exhibits yellowish orange emission (λem = 586 nm in a thin film). Multicolor PL emissions are successfully achieved by simple tuning of changing electron-donating and electron-accepting moieties of the compounds, covering the visible region from blue-green to red. It has been revealed that ICT processes in the excited states and weak intermolecular interactions play important roles in the determination of the PL properties of the materials, by measurements of UV–vis absorption and emission spectra, fluorescence lifetimes, and PL quantum yields
Christopher W. Bielawski - One of the best experts on this subject based on the ideXlab platform.
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An N,N′-Diamidocarbene: Studies in C−H Insertion, Reversible Carbonylation, and Transition-Metal Coordination Chemistry
Journal of the American Chemical Society, 2009Co-Authors: Todd W. Hudnall, Christopher W. BielawskiAbstract:Treatment of dimethylmalonyl dichloride with N,N'-bis(2,6-diisopropylphenyl)-N-trimethylsilylformamidine followed by trimethylsilyl triflate (TMS.OTf) afforded the Pyrimidinium Salt [1H][OTf] in >99% yield. Subsequent deprotonation of this Salt led to the formation of the corresponding free N-heterocyclic carbene (NHC) 1. Exhibiting a reactivity profile that is characteristic of traditional electrophilic carbenes, 1 was found to insert into a tertiary C-H bond and reversibly fix carbon monoxide (CO) under mild conditions to afford the first example of a diamidoketene. Remarkably, the aforementioned carbonylation reaction was found to be thermally reversible (K(eq) = 2.62 M(-1) at 30 degrees C; DeltaH degrees = -35.33 kJ mol(-1) and DeltaS degrees = -109.5 J mol(-1) K(-1)). NHC 1 also displayed nucleophilic characteristics. Treatment of 1 with [Ir(COD)Cl](2) (COD = 1,5-cyclooctadiene) afforded 1-[Ir(COD)Cl], a complex with bond lengths and angles that were in accord with known NHC analogues. Treatment of 1-[Ir(COD)Cl] with CO afforded the carbonyl complex 1-[Ir(CO)(2)Cl]. IR studies of this complex revealed a Tolman Electronic Parameter of 2057 cm(-1), a value similar to those for analogous metal complexes containing tricyclohexylphosphine.
