A novel coordination polymer, [Co3 （bta）2（dib）2]·4H2O （1, H3bta=benzene-1,3,5-triacetic acid, and dib=1,4-di（1H-imidazol-1-yl）benzene）, has been hydrothermally prepared and characterized by IR spectroscop...A novel coordination polymer, [Co3 （bta）2（dib）2]·4H2O （1, H3bta=benzene-1,3,5-triacetic acid, and dib=1,4-di（1H-imidazol-1-yl）benzene）, has been hydrothermally prepared and characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The crystal is of triclinic system, space group Pī, with a=9.141（2）, b=9.667（2）, c=13.855（2）, α=100.83（3）, β=90.81（3）, γ=100.94（3）°, V=1179.0（4）3 , C48H46N8O16Co3 , Mr=1167.72, Dc=1.645 g/cm 3 , F（000）=599, μ=1.127 mm-1 and Z=1. The final R=0.0634 and wR=0.1703 for 4291 observed reflections （I 〉 2σ（I））. In the title complex, the bta ligand acts as a four-dentate bridging ligand to link up cobalt atoms into a lamellar framework, which are further interlinked by the dib ligands to generate a binodal （3,8）-connected tfz-d net.展开更多
We report an electrochemically assisted mechanically controllable break junction （EC-MCBJ） approach to investigating single molecule conductance. Electrode pairs connected with a gold nanobridge were fabricated by e...We report an electrochemically assisted mechanically controllable break junction （EC-MCBJ） approach to investigating single molecule conductance. Electrode pairs connected with a gold nanobridge were fabricated by electrochemical deposition and then mounted on a homebuilt MCBJ platform. A large number of Au- molecule-Au junctions were produced sequentially by repeated breaking and reconnecting of the gold nanobridge. In order to measure their single molecule conductance, statistical conductance histograms were generated for benzene-l,4-dithiol （BDT） and 4,4＇-bipyridine （BPY）. The values extracted from these histograms were found to be in the same range as values previously reported in the literature. Our method is distinct from the ones used to acquire these previously reported literature values, however, in that it is faster, simpler, more cost-effective, and changing the electrode material is more convenient.展开更多
A facile and convenient synthesis method has been developed for substituted quinoxalines and 2H-benzo[b][1,4]oxazines from the reactions of a-bromoketones with benzene-1,2-diamine and 2-aminophenol, respectively, whic...A facile and convenient synthesis method has been developed for substituted quinoxalines and 2H-benzo[b][1,4]oxazines from the reactions of a-bromoketones with benzene-1,2-diamine and 2-aminophenol, respectively, which were catalyzed by tetrabutylammonium bromide（TBAB） in aqueous basic media.展开更多
基金supported by the National Natural Science Foundation of China(Nos.20971004,21171097)the Key Project of the Chinese Ministry of Education (No.210102)
文摘A novel coordination polymer, [Co3 （bta）2（dib）2]·4H2O （1, H3bta=benzene-1,3,5-triacetic acid, and dib=1,4-di（1H-imidazol-1-yl）benzene）, has been hydrothermally prepared and characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The crystal is of triclinic system, space group Pī, with a=9.141（2）, b=9.667（2）, c=13.855（2）, α=100.83（3）, β=90.81（3）, γ=100.94（3）°, V=1179.0（4）3 , C48H46N8O16Co3 , Mr=1167.72, Dc=1.645 g/cm 3 , F（000）=599, μ=1.127 mm-1 and Z=1. The final R=0.0634 and wR=0.1703 for 4291 observed reflections （I 〉 2σ（I））. In the title complex, the bta ligand acts as a four-dentate bridging ligand to link up cobalt atoms into a lamellar framework, which are further interlinked by the dib ligands to generate a binodal （3,8）-connected tfz-d net.
文摘We report an electrochemically assisted mechanically controllable break junction （EC-MCBJ） approach to investigating single molecule conductance. Electrode pairs connected with a gold nanobridge were fabricated by electrochemical deposition and then mounted on a homebuilt MCBJ platform. A large number of Au- molecule-Au junctions were produced sequentially by repeated breaking and reconnecting of the gold nanobridge. In order to measure their single molecule conductance, statistical conductance histograms were generated for benzene-l,4-dithiol （BDT） and 4,4＇-bipyridine （BPY）. The values extracted from these histograms were found to be in the same range as values previously reported in the literature. Our method is distinct from the ones used to acquire these previously reported literature values, however, in that it is faster, simpler, more cost-effective, and changing the electrode material is more convenient.
基金Supported by the National Natural Science Foundation of China(Nos.20572013 and 20711130229)the Department of Science and Technology of Jilin Province, China(No.20050309-2).
文摘A facile and convenient synthesis method has been developed for substituted quinoxalines and 2H-benzo[b][1,4]oxazines from the reactions of a-bromoketones with benzene-1,2-diamine and 2-aminophenol, respectively, which were catalyzed by tetrabutylammonium bromide（TBAB） in aqueous basic media.
