The Experts below are selected from a list of 33366 Experts worldwide ranked by ideXlab platform
Masakatsu Matsumoto - One of the best experts on this subject based on the ideXlab platform.
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intramolecular charge transfer induced decomposition promoted by an aprotic Polar Solvent for bicyclic dioxetanes bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Journal of Organic Chemistry, 2011Co-Authors: Masatoshi Tanimura, Nobuko Watanabe, Hisako K Ijuin, Masakatsu MatsumotoAbstract:Bicyclic dioxetanes 3a−d bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl group decomposed to give the corresponding keto esters 4a−d accompanied by the emission of bright light when simply dissolved in an aprotic Polar Solvent such as N-methylpyrrolidone (NMP) or DMF at 50−100 °C. This Solvent-promoted decomposition (SPD) was effectively a chemiluminescence process caused by the hydrogen bonding of a phenolic OH with a Solvent molecule(s). The characteristics of the chemiluminescence in SPD resembled those in base-induced decomposition (BID), which occurs through an oxidoaryl-substituted dioxetane 5 by an intramolecular charge-transfer-induced decomposition (CTID) mechanism. Both free energies of activation, ΔG⧧SPD and ΔG⧧BID, increased in the order 3a < 3b < 3c < 3d, and were linearly correlated with each other. However, SPD showed features different from those of BID in terms of enthalpy of activation and entropy of activation. SPD had large negative values for ΔS⧧ (ca. −71 J mol−1 K−1) regardless of th...
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Solvent promoted chemiluminescent decomposition of a bicyclic dioxetane bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Tetrahedron Letters, 2008Co-Authors: Masakatsu Matsumoto, Masatoshi Tanimura, Nobuko Watanabe, Taichi Akimoto, Hisako K IjuinAbstract:An aprotic Polar Solvent such as N-methylpyrrolidone (NMP) promoted the thermal decomposition of bicyclic dioxetane bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl moiety 1 without the addition of any base. This Solvent-promoted decomposition (SPD) gave light as effectively as the base-induced decomposition (BID) in an aprotic Polar Solvent. SPD caused intramolecular CT-induced chemiluminescence similar to BID, but, in contrast to BID, SPD proceeded through a pathway with a large negative entropy of activation. Dioxetane 1 was also shown to give light due to excited state intramolecular proton transfer (ESIPT) upon heating in p-xylene.
Hisako K Ijuin - One of the best experts on this subject based on the ideXlab platform.
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intramolecular charge transfer induced decomposition promoted by an aprotic Polar Solvent for bicyclic dioxetanes bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Journal of Organic Chemistry, 2011Co-Authors: Masatoshi Tanimura, Nobuko Watanabe, Hisako K Ijuin, Masakatsu MatsumotoAbstract:Bicyclic dioxetanes 3a−d bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl group decomposed to give the corresponding keto esters 4a−d accompanied by the emission of bright light when simply dissolved in an aprotic Polar Solvent such as N-methylpyrrolidone (NMP) or DMF at 50−100 °C. This Solvent-promoted decomposition (SPD) was effectively a chemiluminescence process caused by the hydrogen bonding of a phenolic OH with a Solvent molecule(s). The characteristics of the chemiluminescence in SPD resembled those in base-induced decomposition (BID), which occurs through an oxidoaryl-substituted dioxetane 5 by an intramolecular charge-transfer-induced decomposition (CTID) mechanism. Both free energies of activation, ΔG⧧SPD and ΔG⧧BID, increased in the order 3a < 3b < 3c < 3d, and were linearly correlated with each other. However, SPD showed features different from those of BID in terms of enthalpy of activation and entropy of activation. SPD had large negative values for ΔS⧧ (ca. −71 J mol−1 K−1) regardless of th...
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Solvent promoted chemiluminescent decomposition of a bicyclic dioxetane bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Tetrahedron Letters, 2008Co-Authors: Masakatsu Matsumoto, Masatoshi Tanimura, Nobuko Watanabe, Taichi Akimoto, Hisako K IjuinAbstract:An aprotic Polar Solvent such as N-methylpyrrolidone (NMP) promoted the thermal decomposition of bicyclic dioxetane bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl moiety 1 without the addition of any base. This Solvent-promoted decomposition (SPD) gave light as effectively as the base-induced decomposition (BID) in an aprotic Polar Solvent. SPD caused intramolecular CT-induced chemiluminescence similar to BID, but, in contrast to BID, SPD proceeded through a pathway with a large negative entropy of activation. Dioxetane 1 was also shown to give light due to excited state intramolecular proton transfer (ESIPT) upon heating in p-xylene.
Masatoshi Tanimura - One of the best experts on this subject based on the ideXlab platform.
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intramolecular charge transfer induced decomposition promoted by an aprotic Polar Solvent for bicyclic dioxetanes bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Journal of Organic Chemistry, 2011Co-Authors: Masatoshi Tanimura, Nobuko Watanabe, Hisako K Ijuin, Masakatsu MatsumotoAbstract:Bicyclic dioxetanes 3a−d bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl group decomposed to give the corresponding keto esters 4a−d accompanied by the emission of bright light when simply dissolved in an aprotic Polar Solvent such as N-methylpyrrolidone (NMP) or DMF at 50−100 °C. This Solvent-promoted decomposition (SPD) was effectively a chemiluminescence process caused by the hydrogen bonding of a phenolic OH with a Solvent molecule(s). The characteristics of the chemiluminescence in SPD resembled those in base-induced decomposition (BID), which occurs through an oxidoaryl-substituted dioxetane 5 by an intramolecular charge-transfer-induced decomposition (CTID) mechanism. Both free energies of activation, ΔG⧧SPD and ΔG⧧BID, increased in the order 3a < 3b < 3c < 3d, and were linearly correlated with each other. However, SPD showed features different from those of BID in terms of enthalpy of activation and entropy of activation. SPD had large negative values for ΔS⧧ (ca. −71 J mol−1 K−1) regardless of th...
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Solvent promoted chemiluminescent decomposition of a bicyclic dioxetane bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Tetrahedron Letters, 2008Co-Authors: Masakatsu Matsumoto, Masatoshi Tanimura, Nobuko Watanabe, Taichi Akimoto, Hisako K IjuinAbstract:An aprotic Polar Solvent such as N-methylpyrrolidone (NMP) promoted the thermal decomposition of bicyclic dioxetane bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl moiety 1 without the addition of any base. This Solvent-promoted decomposition (SPD) gave light as effectively as the base-induced decomposition (BID) in an aprotic Polar Solvent. SPD caused intramolecular CT-induced chemiluminescence similar to BID, but, in contrast to BID, SPD proceeded through a pathway with a large negative entropy of activation. Dioxetane 1 was also shown to give light due to excited state intramolecular proton transfer (ESIPT) upon heating in p-xylene.
Jiamin Shieh - One of the best experts on this subject based on the ideXlab platform.
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thermoplasmonics assisted nanoheterostructured au decorated cuins2 nanoparticles matching solar spectrum absorption and its application on selective distillation of non Polar Solvent systems by thermal solar energy
Nano Energy, 2015Co-Authors: Chia Wei Chen, Ming Fang, Yu Ze Chen, Yichung Wang, Chang Hong Shen, Jiamin Shieh, Johnny C Ho, Yulun ChuehAbstract:Abstract In this work, enhanced broadband solar spectrum absorption and solar-thermal conversion efficiency (~ 8%) has realized and reported by Au-decorated CuInS 2 nanoparticles, namely Au@CIS NPs. The morphologies, compositions and absorptions were characterized by high resolution transmission electron microscopy (HR-TEM), UV–vis spectrometer and Finite-Difference Time-Domain (FDTD) numeric methods. The Au@CIS NPs shows a distinguished absorption perfectly matching AM1.5 G solar spectrum, compared with pure Au, CIS and CIS–Au mixture nanoparticles (NPs) owing to near field plasmonic-assisted effect. In addition, the Au@CIS NPs proves its practical applications on selective distillation in non-Polar Solvent systems, for which the selective distillation of methylcyclohexane from toluene as an example was demonstrated. The approach can evoke future developments of plasmonic-assisted heterostructure in nanoscale for thermal solar energy harvesting application.
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thermoplasmonics assisted nanoheterostructured au decorated cuins2 nanoparticles matching solar spectrum absorption and its application on selective distillation of non Polar Solvent systems by thermal solar energy
Nano Energy, 2015Co-Authors: Yu Ting Yen, Chia Wei Chen, Ming Fang, Yu Ze Chen, Yichung Wang, Chang Hong Shen, Chihchung Lai, Cheng Hung Hsu, Hao Lin, Jiamin ShiehAbstract:Abstract In this work, enhanced broadband solar spectrum absorption and solar-thermal conversion efficiency (~ 8%) has realized and reported by Au-decorated CuInS 2 nanoparticles, namely Au@CIS NPs. The morphologies, compositions and absorptions were characterized by high resolution transmission electron microscopy (HR-TEM), UV–vis spectrometer and Finite-Difference Time-Domain (FDTD) numeric methods. The Au@CIS NPs shows a distinguished absorption perfectly matching AM1.5 G solar spectrum, compared with pure Au, CIS and CIS–Au mixture nanoparticles (NPs) owing to near field plasmonic-assisted effect. In addition, the Au@CIS NPs proves its practical applications on selective distillation in non-Polar Solvent systems, for which the selective distillation of methylcyclohexane from toluene as an example was demonstrated. The approach can evoke future developments of plasmonic-assisted heterostructure in nanoscale for thermal solar energy harvesting application.
Nobuko Watanabe - One of the best experts on this subject based on the ideXlab platform.
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intramolecular charge transfer induced decomposition promoted by an aprotic Polar Solvent for bicyclic dioxetanes bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Journal of Organic Chemistry, 2011Co-Authors: Masatoshi Tanimura, Nobuko Watanabe, Hisako K Ijuin, Masakatsu MatsumotoAbstract:Bicyclic dioxetanes 3a−d bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl group decomposed to give the corresponding keto esters 4a−d accompanied by the emission of bright light when simply dissolved in an aprotic Polar Solvent such as N-methylpyrrolidone (NMP) or DMF at 50−100 °C. This Solvent-promoted decomposition (SPD) was effectively a chemiluminescence process caused by the hydrogen bonding of a phenolic OH with a Solvent molecule(s). The characteristics of the chemiluminescence in SPD resembled those in base-induced decomposition (BID), which occurs through an oxidoaryl-substituted dioxetane 5 by an intramolecular charge-transfer-induced decomposition (CTID) mechanism. Both free energies of activation, ΔG⧧SPD and ΔG⧧BID, increased in the order 3a < 3b < 3c < 3d, and were linearly correlated with each other. However, SPD showed features different from those of BID in terms of enthalpy of activation and entropy of activation. SPD had large negative values for ΔS⧧ (ca. −71 J mol−1 K−1) regardless of th...
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Solvent promoted chemiluminescent decomposition of a bicyclic dioxetane bearing a 4 benzothiazol 2 yl 3 hydroxyphenyl moiety
Tetrahedron Letters, 2008Co-Authors: Masakatsu Matsumoto, Masatoshi Tanimura, Nobuko Watanabe, Taichi Akimoto, Hisako K IjuinAbstract:An aprotic Polar Solvent such as N-methylpyrrolidone (NMP) promoted the thermal decomposition of bicyclic dioxetane bearing a 4-(benzothiazol-2-yl)-3-hydroxyphenyl moiety 1 without the addition of any base. This Solvent-promoted decomposition (SPD) gave light as effectively as the base-induced decomposition (BID) in an aprotic Polar Solvent. SPD caused intramolecular CT-induced chemiluminescence similar to BID, but, in contrast to BID, SPD proceeded through a pathway with a large negative entropy of activation. Dioxetane 1 was also shown to give light due to excited state intramolecular proton transfer (ESIPT) upon heating in p-xylene.