A new two-dimensional （2D） manganese（II） coordination polymer {[Mn（bidc）（H2O）2]· 2H2O}n （H2bidc = benzimidazole-5,6-dicarboxylic acid） was synthesized, and characterized by X-ray crystallography and oth...A new two-dimensional （2D） manganese（II） coordination polymer {[Mn（bidc）（H2O）2]· 2H2O}n （H2bidc = benzimidazole-5,6-dicarboxylic acid） was synthesized, and characterized by X-ray crystallography and other measurements. The complex crystallizes in the orthorhombic system, space group Pbca with a = 7.0218（7）, b = 17.9701（18）, c = 19.0697（19）, V = 2406.3（4）3, Z = 8, Dc = 1.823 g/cm3, Mr = 330.14, F（000） = 1344, μ（MoKα） = 1.140 mm-1, S = 1.055, R = 0.0305 and wR = 0.1012 for 2130 observed reflections （I 2σ（I））. The title complex consists of a novel 2D network with a topology of short symbol （4.82）（4.82）.展开更多
Poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) is an aromatic polyester with molecular structure similar to that of poly(ethylene terephthalate)(PET). In this paper, the space charge storage ability and its stabil...Poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) is an aromatic polyester with molecular structure similar to that of poly(ethylene terephthalate)(PET). In this paper, the space charge storage ability and its stability in corona charged PEN were studied by measurement of surface potential decay under different storage conditions including dif- ferent temperatures and relative humidities, and analysis of open circuit thermally stimu- lated discharge (TSD) current spectra and charge TSD curves. The comparison between the charge stability of PEN and PET was carried out. The results point out that the charge stability of PEN is markedly better than that of PET under different environmental condi- tions. By means of isothermal depolarization program, the space charge lifetimes (effec- tive time constant) τ at room temperature of positively and negatively charged PEN are estimated to be 90 y. The results offer theoretical and technical support for the use of PEN as the chip of high quality electret condenser microphone due to its excellent dielectric, mechanical and thermal properties.展开更多
基金supported by the National Natural Science Foundation of China (No. 40743017)the Open Foundation of Jiangsu Key Laboratory of Precious Metals Chemistry (SYGK0706)
文摘A new two-dimensional （2D） manganese（II） coordination polymer {[Mn（bidc）（H2O）2]· 2H2O}n （H2bidc = benzimidazole-5,6-dicarboxylic acid） was synthesized, and characterized by X-ray crystallography and other measurements. The complex crystallizes in the orthorhombic system, space group Pbca with a = 7.0218（7）, b = 17.9701（18）, c = 19.0697（19）, V = 2406.3（4）3, Z = 8, Dc = 1.823 g/cm3, Mr = 330.14, F（000） = 1344, μ（MoKα） = 1.140 mm-1, S = 1.055, R = 0.0305 and wR = 0.1012 for 2130 observed reflections （I 2σ（I））. The title complex consists of a novel 2D network with a topology of short symbol （4.82）（4.82）.
基金supported by the National Natural Science Foundation of China(Grant No.50503018)the Volkswagen Foundation(Grant No.I/77365).
文摘Poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) is an aromatic polyester with molecular structure similar to that of poly(ethylene terephthalate)(PET). In this paper, the space charge storage ability and its stability in corona charged PEN were studied by measurement of surface potential decay under different storage conditions including dif- ferent temperatures and relative humidities, and analysis of open circuit thermally stimu- lated discharge (TSD) current spectra and charge TSD curves. The comparison between the charge stability of PEN and PET was carried out. The results point out that the charge stability of PEN is markedly better than that of PET under different environmental condi- tions. By means of isothermal depolarization program, the space charge lifetimes (effec- tive time constant) τ at room temperature of positively and negatively charged PEN are estimated to be 90 y. The results offer theoretical and technical support for the use of PEN as the chip of high quality electret condenser microphone due to its excellent dielectric, mechanical and thermal properties.
