A new benzoimidazole-naphthalimide derivative 4 was synthesized and its photophysical properties were studied. This compound showed highly selectively and sensitive colorimetric and ratiometric sensing ability for flu...A new benzoimidazole-naphthalimide derivative 4 was synthesized and its photophysical properties were studied. This compound showed highly selectively and sensitive colorimetric and ratiometric sensing ability for fluoride anion.展开更多
Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phen...Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phenyl-amine （BS2）, are investigated with one- and two-photon static spectroscopy, and the femtosecond fluorescence up-conversion technique. The molecules show branch-based fluorescence emission at low quantum yield. U1trafast non-radiative decay on a picosecond time scale is found and is attributed to intramolecular charge-transfer bridged by the central triphenylamine. The two-photon absorption cross-sections of BS1 and BS2 are 19.1 and 19.4 GM, respectively.展开更多
Aminochlorination of methylenecyclopropanes （MCPs） 1 can be achieved under CO2 atmosphere using N,N-dichlorotoluenesulfonamine （TsNCl2） as the nitrogen and halogen sources at room temperature to give the correspon...Aminochlorination of methylenecyclopropanes （MCPs） 1 can be achieved under CO2 atmosphere using N,N-dichlorotoluenesulfonamine （TsNCl2） as the nitrogen and halogen sources at room temperature to give the corresponding normal ring-remaining aminochlorinated products 2 along with/without the ring-opened aminochlorinated products 3 in moderate to good total yields. The present process takes the advantage of the green benign reaction conditions in the absence of any metal catalyst and solvent.展开更多
The microwave-assisted substitution of β-dicarbonyl compounds with secondary alcohols has been achieved efficiently, using very cheap fluoroboric acid （HBF4） as the catalyst. For various β-dicarbonyl compounds and...The microwave-assisted substitution of β-dicarbonyl compounds with secondary alcohols has been achieved efficiently, using very cheap fluoroboric acid （HBF4） as the catalyst. For various β-dicarbonyl compounds and a series of secondary alcohols, the direct substitution gives high yields after only 5 min of microwave irradiation.展开更多
Room temperature molten salt 1-methyl-3-（trimethylsilyl）methyl-imidazolium iodide （MSII） was used for io-dide sources in dye-sensitized solar cells with an organic sensitizer 2-cyano-3-[5-[4-[3-[4-（4-（N,N-bis（4...Room temperature molten salt 1-methyl-3-（trimethylsilyl）methyl-imidazolium iodide （MSII） was used for io-dide sources in dye-sensitized solar cells with an organic sensitizer 2-cyano-3-[5-[4-[3-[4-（4-（N,N-bis（4-methoxy-phenyl）amino）phenyl）phenyl]-2,5-di-n-butyl-pyrrolo[3,4-c]pyrrole-1,4-dione]phenyl] furan-2-yl] acrylic acid （DPP-I） as light harvester. With an optimized electrolyte （MSII ： I2 ： BI ： GuNCS=24 ： 2 ： 2 ： 0.4, BI and GuCNS are short for benzimidazole and guanidine thiocyanate, respectively）, photovoltaic parameters （Jsc, Voc, and ff） of device are 8.97 mA·cm^-2, 600 mV and 0.61, respectively, yielding a maximum overall photo-to-energy con-version efficiency （17） of 3.23%. And then the charge-transfer mechanism of devices was deeply analyzed with elec- trochemical impedance spectroscopy （EIS） in the dark.展开更多
基金supported by National Basic Research 973 Program (No.2006CB806200) and Scientific Committee of Shanghai.
文摘A new benzoimidazole-naphthalimide derivative 4 was synthesized and its photophysical properties were studied. This compound showed highly selectively and sensitive colorimetric and ratiometric sensing ability for fluoride anion.
基金Supported by the National Natural Science Foundation of China under Grant Nos 60508011, 60878019, 10821062, 10934001, 60677002 and 10828407, and the National Basic Research Program of China under Grant Nos 2009CB930504, 2007CB307001, 2006CB921601 and 2006CB806007.
文摘Mono- and dual-branched molecules, { 4-[2-（4-benzothiazol-2-yl-phenyl）-vinyl]-phenyl}-（4-methoxy-phenyl）-phenyl- amine （BS1） and bis-{4-[2- （4-benzothiazol-2-yl-phenyl）-vinyI]-phenyl}-（4-methoxy-phenyI）-phenyl-amine （BS2）, are investigated with one- and two-photon static spectroscopy, and the femtosecond fluorescence up-conversion technique. The molecules show branch-based fluorescence emission at low quantum yield. U1trafast non-radiative decay on a picosecond time scale is found and is attributed to intramolecular charge-transfer bridged by the central triphenylamine. The two-photon absorption cross-sections of BS1 and BS2 are 19.1 and 19.4 GM, respectively.
基金Project supported by Shanghai Municipal Committee of Science and Technology （No. 08dj1400100-2）, National Basic Research Program of China （973） （No. 2009CB825300） and the National Natural Science Foundation of China （Nos. 21072206, 20472096, 20872162, 20672127, 20821002 and 20732008）.
文摘Aminochlorination of methylenecyclopropanes （MCPs） 1 can be achieved under CO2 atmosphere using N,N-dichlorotoluenesulfonamine （TsNCl2） as the nitrogen and halogen sources at room temperature to give the corresponding normal ring-remaining aminochlorinated products 2 along with/without the ring-opened aminochlorinated products 3 in moderate to good total yields. The present process takes the advantage of the green benign reaction conditions in the absence of any metal catalyst and solvent.
基金Project supported by the National Natural Science Foundation of China （No. 20902020）, the Shanghai Pujiang Talent Program （No. 09PJ1403500） and the Fundamental Research Funds for the Central Universities.
文摘The microwave-assisted substitution of β-dicarbonyl compounds with secondary alcohols has been achieved efficiently, using very cheap fluoroboric acid （HBF4） as the catalyst. For various β-dicarbonyl compounds and a series of secondary alcohols, the direct substitution gives high yields after only 5 min of microwave irradiation.
基金This work was supported by the National Natural Science Foundation of China （Nos. 61006048 and 21172073）, the Fundamental Research Funds for the Central Universities （Nos. WJ 1014025 and W J0913001）, and Ph. D. Programs Foundation of Ministry of Educa-tion of China （No. 20090074110004） and Scientific Committee of Shanghai （No. 10520709700）.
文摘Room temperature molten salt 1-methyl-3-（trimethylsilyl）methyl-imidazolium iodide （MSII） was used for io-dide sources in dye-sensitized solar cells with an organic sensitizer 2-cyano-3-[5-[4-[3-[4-（4-（N,N-bis（4-methoxy-phenyl）amino）phenyl）phenyl]-2,5-di-n-butyl-pyrrolo[3,4-c]pyrrole-1,4-dione]phenyl] furan-2-yl] acrylic acid （DPP-I） as light harvester. With an optimized electrolyte （MSII ： I2 ： BI ： GuNCS=24 ： 2 ： 2 ： 0.4, BI and GuCNS are short for benzimidazole and guanidine thiocyanate, respectively）, photovoltaic parameters （Jsc, Voc, and ff） of device are 8.97 mA·cm^-2, 600 mV and 0.61, respectively, yielding a maximum overall photo-to-energy con-version efficiency （17） of 3.23%. And then the charge-transfer mechanism of devices was deeply analyzed with elec- trochemical impedance spectroscopy （EIS） in the dark.
