A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All ...A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All new compounds were fully characterized by IR, 1H NMR, 13 C NMR , 31 P NMR , MALDI TOFMS and elemental analyses.展开更多
以二苯基-1-甲基咪唑膦(dpim)为配体制备了一种新型的配合物催化剂Ni(dpim)_2Cl_2.循环伏安研究表明,Ni(dpim)2Cl2配合物在氮气气氛下表现出两步还原的电化学行为,在-0.7 V下为两电子的不可逆还原,在-1.3 V下为单电子准可逆还原.向电解...以二苯基-1-甲基咪唑膦(dpim)为配体制备了一种新型的配合物催化剂Ni(dpim)_2Cl_2.循环伏安研究表明,Ni(dpim)2Cl2配合物在氮气气氛下表现出两步还原的电化学行为,在-0.7 V下为两电子的不可逆还原,在-1.3 V下为单电子准可逆还原.向电解液中通入CO_2后,在-1.3 V下的还原峰变得不可逆,且其峰电流从0.48 m A·cm^(-2)增大到0.55 m A·cm^(-2).在质子源(CH3OH)存在的条件下,该还原峰电流可继续增大到0.72 m A·cm^(-2).该研究结果表明,Ni(dpim)_2Cl_2配合物对CO_2还原具有良好的电催化性能,且其电催化还原过程符合ECE机理.在-1.3 V下恒电位电解得到的还原产物主要为CO,催化转换频率(Turnover of Frenquency,TOF)为0.17 s^(-1).展开更多
A novel triphenylphosphine-contained poly(ether ether ketone ketone) was synthesized from bis[4-(p-fluorobenzoyl)-phenyl]phenylphosphine oxide and hydroquinone by nucleophilic copolycondensation with sulfolane as the ...A novel triphenylphosphine-contained poly(ether ether ketone ketone) was synthesized from bis[4-(p-fluorobenzoyl)-phenyl]phenylphosphine oxide and hydroquinone by nucleophilic copolycondensation with sulfolane as the solvent. The structure was confirmed via FTIR, 31P NMR and 1H NMR. Electrical property, mechanical property, heat-resistance property, flame resistance and solubility were also evaluated. The results show that the polymer has an excellent heat-resistance, the glass transition temperature(Tg) is 212.6 ℃. The 5% mass loss of the polymer in nitrogen atmosphere took place at 476 ℃. The polymer is soluble in many organic solvents, such as CH2Cl2, CHCl3, Cl2(CH)2Cl2, Cl(CH2)2Cl, DMF, and NMP at room temperature, the polymer possesses well film ability, good mechanics property, electrical property, and the LOI is 44 which indicates that it possesses an excellent flame retardancy.展开更多
文摘A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All new compounds were fully characterized by IR, 1H NMR, 13 C NMR , 31 P NMR , MALDI TOFMS and elemental analyses.
文摘以二苯基-1-甲基咪唑膦(dpim)为配体制备了一种新型的配合物催化剂Ni(dpim)_2Cl_2.循环伏安研究表明,Ni(dpim)2Cl2配合物在氮气气氛下表现出两步还原的电化学行为,在-0.7 V下为两电子的不可逆还原,在-1.3 V下为单电子准可逆还原.向电解液中通入CO_2后,在-1.3 V下的还原峰变得不可逆,且其峰电流从0.48 m A·cm^(-2)增大到0.55 m A·cm^(-2).在质子源(CH3OH)存在的条件下,该还原峰电流可继续增大到0.72 m A·cm^(-2).该研究结果表明,Ni(dpim)_2Cl_2配合物对CO_2还原具有良好的电催化性能,且其电催化还原过程符合ECE机理.在-1.3 V下恒电位电解得到的还原产物主要为CO,催化转换频率(Turnover of Frenquency,TOF)为0.17 s^(-1).
文摘A novel triphenylphosphine-contained poly(ether ether ketone ketone) was synthesized from bis[4-(p-fluorobenzoyl)-phenyl]phenylphosphine oxide and hydroquinone by nucleophilic copolycondensation with sulfolane as the solvent. The structure was confirmed via FTIR, 31P NMR and 1H NMR. Electrical property, mechanical property, heat-resistance property, flame resistance and solubility were also evaluated. The results show that the polymer has an excellent heat-resistance, the glass transition temperature(Tg) is 212.6 ℃. The 5% mass loss of the polymer in nitrogen atmosphere took place at 476 ℃. The polymer is soluble in many organic solvents, such as CH2Cl2, CHCl3, Cl2(CH)2Cl2, Cl(CH2)2Cl, DMF, and NMP at room temperature, the polymer possesses well film ability, good mechanics property, electrical property, and the LOI is 44 which indicates that it possesses an excellent flame retardancy.
