The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Ben Zhong Tang - One of the best experts on this subject based on the ideXlab platform.
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ferrocene based poly aroxycarbonyltriazole s synthesis by metal free click polymerization and use as precursors to magnetic ceramics
Polymer Chemistry, 2013Co-Authors: Jacky Wing Yip Lam, Ben Zhong Tang, Anjun Qin, Jing Zhi SunAbstract:Ferrocene-based poly(aroxycarbonyltriazole)s with high molecular weights and regioregularities were prepared in high yields by the efficient metal-free click polymerization of dipropiolates and the ferrocene-containing diazide under mild reaction conditions. The resulting polytriazoles are redox active, and could be used as precursors to generate soft magnetic ceramics with high magnetizability and low coercivity when pyrolyzed at elevated temperatures.
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hyperbranched poly aroxycarbonyltriazole s metal free click polymerization light refraction aggregation induced emission explosive detection and fluorescent patterning
Macromolecules, 2013Co-Authors: Engui Zhao, Anjun Qin, Jing Zhi Sun, Ben Zhong TangAbstract:The metal-free click polymerization (MFCP) of azide and alkyne has become a powerful tool for the synthesis of functional polytriazoles. Among which, the MFCP of propiolate and azide has been used to prepare functional linear poly(aroxycarbonyltriazole)s (PACTs). Their hyperbranched analogues, however, have been rarely prepared. In this paper, hyperbranched PACTs with satisfactory molecular weights and high regioregularities were synthesized in high yields by the MFCP of tripropiolates (1) and tetraphenylethene (TPE)-containing diazide (2) under the optimized reaction conditions without protection from oxygen and moisture. The resultant polymers are soluble in common organic solvents and thermally stable, with 5% loss of their weights at temperatures higher than 330 °C. The polymers exhibit high refractive indices with low chromatic dispersion. Thanks to their contained TPE units, the polymers show the unique feature of aggregation-induced emission, and their aggregates can function as fluorescent sensors...
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ethynyl capped hyperbranched conjugated polytriazole click polymerization clickable modification and aggregation enhanced emission
Macromolecules, 2012Co-Authors: Jian Wang, Ben Zhong Tang, Anjun Qin, Engui Zhao, Jing Zhi Sun, Ju Mei, Zhegang SongAbstract:Cu(I)-catalyzed azide–alkyne click polymerization, developed based on the click reaction, has become a powerful tool for the construction of functional polytriazoles with linear and hyperbranched structures. This method has, however, rarely been used for the preparation of functional hyperbranched conjugated polytriazoles (hb-CPTA). In this paper, soluble ethynyl-capped hb-CPTA with weight-averaged molecular weight of 39 500 was synthesized in high yield (84.4%) by the Cu(I)-catalyzed azide–alkyne click polymerization of tetraphenylethene containing diazide [1,2-bis(4-azidophenyl)-1,2-diphenylethene] and tetrayne [1,1,2,2-tetrakis(4-ethynylphenyl)ethane] in equal concentration. By taking advantage of the ethynyl groups on its periphery, the polymer could be efficiently postfunctionalized by azide–alkyne and thiol–yne click reactions. The polymers are thermally stable and loss 5% of their weights at temperatures higher than 340.0 °C. hb-CPTA also possesses high char yield (74.8%) at 800 °C. The polymers fe...
Helge Willner - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of sulfuryl diazide o2s n3 2
ChemInform, 2011Co-Authors: Xiaoqing Zeng, Helmut Beckers, Eduard Bernhardt, Helge WillnerAbstract:The title compound (caution: explosive) is prepared by reaction of SO2Cl2 and NaN3 in MeCN at room temperature (≈12 h; isolated by fractional condensation in the -30 °C trap).
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synthesis and characterization of sulfuryl diazide o2s n3 2
Inorganic Chemistry, 2011Co-Authors: Xiaoqing Zeng, Helmut Beckers, Eduard Bernhardt, Helge WillnerAbstract:Sulfuryl diazide, O2S(N3)2, previously described as an “exceedingly explosive” compound, has been isolated and characterized by IR (Ar matrix, gas) and Raman (solid) spectroscopy, and its structure has been determined by X-ray crystallography. It has a melting point of −15 °C and can be handled in small quantities in gas, liquid, and solid states. Vibrational spectroscopic studies suggest the presence of only one conformer in both gas and solid states, and the X-ray crystallography revealed an anti conformation of the two azido groups with respect to the NSN plane. Calculations predict the anti (C2) conformer to be 6.6 kJ mol–1 lower in energy than the syn (Cs) one at the CBS-QB3 level of theory. The related chlorosulfuryl azide, ClSO2N3, has also been prepared and characterized by IR and Raman spectroscopy.
Xiaoqing Zeng - One of the best experts on this subject based on the ideXlab platform.
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Decomposition of Sulfonyl Azide Isocyanate and Sulfonyl Diazide: The Oxygen-Shifted Curtius Rearrangement via Sulfonyl Nitrenes
2018Co-Authors: Xuelin Dong, Guohai Deng, Xiaoqing ZengAbstract:Sulfonyl azide isocyanate, (OCN)S(O)2N3, was prepared and characterized by IR (gas, matrix-isolation), Raman (liquid), and UV–vis spectroscopy. Upon flash vacuum pyrolysis (FVP) at ca. 1000 K, gaseous (OCN)S(O)2N3 decomposes completely and yields fragments N2, SO2, SO3, NCN, N3, NCO, CO, CN, and NO. In contrast, the azide splits off N2 and furnishes a transient triplet sulfonyl nitrene intermediate (OCN)S(O)2N upon a 266 nm laser irradiation in solid Ne-matrix at 2.8 K. Subsequent photolysis of the nitrene with visible light (λ = 380–450 nm) results in oxygen-shifted Curtius rearrangement to a novel nitroso sulfoxide (OCN)S(O)NO. For comparison, the photodecomposition of the closely related sulfonyl diazide O2S(N3)2 in a solid Ar matrix was also studied. Upon an ArF excimer laser (193 nm) photolysis, O2S(N3)2 decomposes and yields N2, SO2, and OSNNO via the intermediacy of an elusive sufonyl nitrene N3S(O)2N. Further visible light irradiation (λ > 395 nm) leads to depletion of N3S(O)2N and OSNNO and concomitant formation of SO2 and N2. The identification of the intermediates in cryogenic matrixes by IR spectroscopy was supported by 15N-labeling experiments and quantum chemical calculations. The mechanism for the decomposition of both sulfonyl azides (OCN)S(O)2N3 and O2S(N3)2 was discussed on the basis of the observed intermediates and the calculated potential energy profiles
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Methoxyphosphinidene and Isomeric Methylphosphinidene Oxide
2018Co-Authors: Xianxu Chu, Yang Yang, Weiyu Qian, Chao Song, Manabu Abe, Xiaoqing ZengAbstract:A rare oxyphosphinidene (MeOP) has been generated in the triplet ground state through either photolysis (266 nm) or flash-vacuum pyrolysis (FVP, 700 °C) of methoxydiazidophosphine MeOP(N3)2. Upon ArF laser irradiation (193 nm), an unprecedented isomerization from MeOP to the long-sought methylphosphinidene oxide (MePO) occurs in cryogenic Ne- and N2-matrices. Alternatively, the latter can be efficiently generated through photolysis (193 nm) or FVP (ca. 700 °C) of methylphosphoryl diazide MeP(O)(N3)2, in which the elusive nitrene intermediate MeP(O)(N3)N in the triplet ground state has been also observed by IR (with 15N-labeling) and EPR (|D/hc| = 1.545 cm–1 and |E/hc| = 0.003 95 cm–1) spectroscopy
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synthesis and characterization of sulfuryl diazide o2s n3 2
ChemInform, 2011Co-Authors: Xiaoqing Zeng, Helmut Beckers, Eduard Bernhardt, Helge WillnerAbstract:The title compound (caution: explosive) is prepared by reaction of SO2Cl2 and NaN3 in MeCN at room temperature (≈12 h; isolated by fractional condensation in the -30 °C trap).
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synthesis and characterization of sulfuryl diazide o2s n3 2
Inorganic Chemistry, 2011Co-Authors: Xiaoqing Zeng, Helmut Beckers, Eduard Bernhardt, Helge WillnerAbstract:Sulfuryl diazide, O2S(N3)2, previously described as an “exceedingly explosive” compound, has been isolated and characterized by IR (Ar matrix, gas) and Raman (solid) spectroscopy, and its structure has been determined by X-ray crystallography. It has a melting point of −15 °C and can be handled in small quantities in gas, liquid, and solid states. Vibrational spectroscopic studies suggest the presence of only one conformer in both gas and solid states, and the X-ray crystallography revealed an anti conformation of the two azido groups with respect to the NSN plane. Calculations predict the anti (C2) conformer to be 6.6 kJ mol–1 lower in energy than the syn (Cs) one at the CBS-QB3 level of theory. The related chlorosulfuryl azide, ClSO2N3, has also been prepared and characterized by IR and Raman spectroscopy.
Anjun Qin - One of the best experts on this subject based on the ideXlab platform.
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ferrocene based poly aroxycarbonyltriazole s synthesis by metal free click polymerization and use as precursors to magnetic ceramics
Polymer Chemistry, 2013Co-Authors: Jacky Wing Yip Lam, Ben Zhong Tang, Anjun Qin, Jing Zhi SunAbstract:Ferrocene-based poly(aroxycarbonyltriazole)s with high molecular weights and regioregularities were prepared in high yields by the efficient metal-free click polymerization of dipropiolates and the ferrocene-containing diazide under mild reaction conditions. The resulting polytriazoles are redox active, and could be used as precursors to generate soft magnetic ceramics with high magnetizability and low coercivity when pyrolyzed at elevated temperatures.
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hyperbranched poly aroxycarbonyltriazole s metal free click polymerization light refraction aggregation induced emission explosive detection and fluorescent patterning
Macromolecules, 2013Co-Authors: Engui Zhao, Anjun Qin, Jing Zhi Sun, Ben Zhong TangAbstract:The metal-free click polymerization (MFCP) of azide and alkyne has become a powerful tool for the synthesis of functional polytriazoles. Among which, the MFCP of propiolate and azide has been used to prepare functional linear poly(aroxycarbonyltriazole)s (PACTs). Their hyperbranched analogues, however, have been rarely prepared. In this paper, hyperbranched PACTs with satisfactory molecular weights and high regioregularities were synthesized in high yields by the MFCP of tripropiolates (1) and tetraphenylethene (TPE)-containing diazide (2) under the optimized reaction conditions without protection from oxygen and moisture. The resultant polymers are soluble in common organic solvents and thermally stable, with 5% loss of their weights at temperatures higher than 330 °C. The polymers exhibit high refractive indices with low chromatic dispersion. Thanks to their contained TPE units, the polymers show the unique feature of aggregation-induced emission, and their aggregates can function as fluorescent sensors...
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ethynyl capped hyperbranched conjugated polytriazole click polymerization clickable modification and aggregation enhanced emission
Macromolecules, 2012Co-Authors: Jian Wang, Ben Zhong Tang, Anjun Qin, Engui Zhao, Jing Zhi Sun, Ju Mei, Zhegang SongAbstract:Cu(I)-catalyzed azide–alkyne click polymerization, developed based on the click reaction, has become a powerful tool for the construction of functional polytriazoles with linear and hyperbranched structures. This method has, however, rarely been used for the preparation of functional hyperbranched conjugated polytriazoles (hb-CPTA). In this paper, soluble ethynyl-capped hb-CPTA with weight-averaged molecular weight of 39 500 was synthesized in high yield (84.4%) by the Cu(I)-catalyzed azide–alkyne click polymerization of tetraphenylethene containing diazide [1,2-bis(4-azidophenyl)-1,2-diphenylethene] and tetrayne [1,1,2,2-tetrakis(4-ethynylphenyl)ethane] in equal concentration. By taking advantage of the ethynyl groups on its periphery, the polymer could be efficiently postfunctionalized by azide–alkyne and thiol–yne click reactions. The polymers are thermally stable and loss 5% of their weights at temperatures higher than 340.0 °C. hb-CPTA also possesses high char yield (74.8%) at 800 °C. The polymers fe...
Jing Zhi Sun - One of the best experts on this subject based on the ideXlab platform.
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ferrocene based poly aroxycarbonyltriazole s synthesis by metal free click polymerization and use as precursors to magnetic ceramics
Polymer Chemistry, 2013Co-Authors: Jacky Wing Yip Lam, Ben Zhong Tang, Anjun Qin, Jing Zhi SunAbstract:Ferrocene-based poly(aroxycarbonyltriazole)s with high molecular weights and regioregularities were prepared in high yields by the efficient metal-free click polymerization of dipropiolates and the ferrocene-containing diazide under mild reaction conditions. The resulting polytriazoles are redox active, and could be used as precursors to generate soft magnetic ceramics with high magnetizability and low coercivity when pyrolyzed at elevated temperatures.
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hyperbranched poly aroxycarbonyltriazole s metal free click polymerization light refraction aggregation induced emission explosive detection and fluorescent patterning
Macromolecules, 2013Co-Authors: Engui Zhao, Anjun Qin, Jing Zhi Sun, Ben Zhong TangAbstract:The metal-free click polymerization (MFCP) of azide and alkyne has become a powerful tool for the synthesis of functional polytriazoles. Among which, the MFCP of propiolate and azide has been used to prepare functional linear poly(aroxycarbonyltriazole)s (PACTs). Their hyperbranched analogues, however, have been rarely prepared. In this paper, hyperbranched PACTs with satisfactory molecular weights and high regioregularities were synthesized in high yields by the MFCP of tripropiolates (1) and tetraphenylethene (TPE)-containing diazide (2) under the optimized reaction conditions without protection from oxygen and moisture. The resultant polymers are soluble in common organic solvents and thermally stable, with 5% loss of their weights at temperatures higher than 330 °C. The polymers exhibit high refractive indices with low chromatic dispersion. Thanks to their contained TPE units, the polymers show the unique feature of aggregation-induced emission, and their aggregates can function as fluorescent sensors...
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ethynyl capped hyperbranched conjugated polytriazole click polymerization clickable modification and aggregation enhanced emission
Macromolecules, 2012Co-Authors: Jian Wang, Ben Zhong Tang, Anjun Qin, Engui Zhao, Jing Zhi Sun, Ju Mei, Zhegang SongAbstract:Cu(I)-catalyzed azide–alkyne click polymerization, developed based on the click reaction, has become a powerful tool for the construction of functional polytriazoles with linear and hyperbranched structures. This method has, however, rarely been used for the preparation of functional hyperbranched conjugated polytriazoles (hb-CPTA). In this paper, soluble ethynyl-capped hb-CPTA with weight-averaged molecular weight of 39 500 was synthesized in high yield (84.4%) by the Cu(I)-catalyzed azide–alkyne click polymerization of tetraphenylethene containing diazide [1,2-bis(4-azidophenyl)-1,2-diphenylethene] and tetrayne [1,1,2,2-tetrakis(4-ethynylphenyl)ethane] in equal concentration. By taking advantage of the ethynyl groups on its periphery, the polymer could be efficiently postfunctionalized by azide–alkyne and thiol–yne click reactions. The polymers are thermally stable and loss 5% of their weights at temperatures higher than 340.0 °C. hb-CPTA also possesses high char yield (74.8%) at 800 °C. The polymers fe...
