Copolymer of 2-vinylpyridine and vinylacetate coordinated with dicarbonylrhodium used as a catalyst for carbonylation of methanol to acetic acid and anhydride has been studied. The structural characteristics of the co...Copolymer of 2-vinylpyridine and vinylacetate coordinated with dicarbonylrhodium used as a catalyst for carbonylation of methanol to acetic acid and anhydride has been studied. The structural characteristics of the copolymer ligand and complex, and the influences of the reaction conditions on the carbonylation catalyzed by this polymer complex have been investigated. In comparison with small molecule catalyst of Rh complex, the bidentate copolymer coordinated complex has better thermal stability. The reaction mechanism of the carbonylation reaction is also illustrated.展开更多
The title complex N,O-bis{[2-[（2,4-dimethylphenyl）imino]-5-methoxyl]-phenol}-palladium（Ⅱ）（CC_（32）H_（32）N_2O_4Pd） has been synthesized by the reaction of 2-[（2,4-dimethylphenyl）imino]-5-methoxyl-phenol wit...The title complex N,O-bis{[2-[（2,4-dimethylphenyl）imino]-5-methoxyl]-phenol}-palladium（Ⅱ）（CC_（32）H_（32）N_2O_4Pd） has been synthesized by the reaction of 2-[（2,4-dimethylphenyl）imino]-5-methoxyl-phenol with Pd（CH_3COO）_2,and characterized by elemental analysis,IR spectrum and single-crystal X-ray diffraction analysis.The crystal belongs to the monoclinic system,space group P2_1/c with a = 12.058（2）,b = 8.3624（17）,c = 14.735（3） ？,β = 107.66（3）°,V = 1415.7（5）？~3,C_（32）H_（32）N_2O_4Pd,Mr = 615,Z = 2,D_c = 1.443 Mg/m^3,μ = 0.695 mm^（-1）,F（000） = 632,T = 293（2） K,the final R = 0.0514 and w R = 0.1356（I 〉 2s（I））.Under the co-catalysis of methylaluminoxane（MAO）,the palladium compound exhibited favorable catalytic activity for the polymerization of norbornene（NB）.展开更多
The catalytic property of propylene dimerization by several nickel (Ⅱ), cobalt (Ⅱ) complexes containing N-P bidentate ligands was studied in combination with organoaluminum co-catalysts. The effects of the type of a...The catalytic property of propylene dimerization by several nickel (Ⅱ), cobalt (Ⅱ) complexes containing N-P bidentate ligands was studied in combination with organoaluminum co-catalysts. The effects of the type of aluminum co-catalysts and its relative amount, the nature of precursors in terms of ligand backbone and metal center were investigated. The results indicated that precursor I (N,N-dimethyl-2-(diphenylphosphino)aniline nickel (Ⅱ) dichloride) exhibited high activity in propylene dimerization in the presence of the strong Lewis acid Et3Al2Cl3, whereas low productivity by its cobalt analogues was observed under identical reaction conditions.展开更多
The scalar and vector running coupling constants are derived using the renormalization group method in the σ-ω model. The numerical values of the two running coupling constants are obtained and the physical meaning ...The scalar and vector running coupling constants are derived using the renormalization group method in the σ-ω model. The numerical values of the two running coupling constants are obtained and the physical meaning of the result is discussed.展开更多
The N-N <sup>1</sup>S<sub>0</sub> scattering length differences Δα<sub>CSB</sub> and Δα<sub>CIH</sub> of the charge symmetrybreaking and charge independence breaking...The N-N <sup>1</sup>S<sub>0</sub> scattering length differences Δα<sub>CSB</sub> and Δα<sub>CIH</sub> of the charge symmetrybreaking and charge independence breaking are calculated by a resonating group method with aquark cluster model.By adding the QED-QCD interference effect to the quark mass differenceand the electromagnetic interaction,the Δα<sub>CSH</sub> and Δα<sub>CIH</sub> can be reproduced with modelparameters constrained by the hadron isomultiplet masses.展开更多
文摘Copolymer of 2-vinylpyridine and vinylacetate coordinated with dicarbonylrhodium used as a catalyst for carbonylation of methanol to acetic acid and anhydride has been studied. The structural characteristics of the copolymer ligand and complex, and the influences of the reaction conditions on the carbonylation catalyzed by this polymer complex have been investigated. In comparison with small molecule catalyst of Rh complex, the bidentate copolymer coordinated complex has better thermal stability. The reaction mechanism of the carbonylation reaction is also illustrated.
基金Supported by the Natural Science Foundation of Fujian Province(2010J01026)the Ministry of Education of China(No.208066)+1 种基金the Education Department of Fujian Province(JA07029)the State Key Laboratory of Structural Chemistry(No.20130013)
文摘The title complex N,O-bis{[2-[（2,4-dimethylphenyl）imino]-5-methoxyl]-phenol}-palladium（Ⅱ）（CC_（32）H_（32）N_2O_4Pd） has been synthesized by the reaction of 2-[（2,4-dimethylphenyl）imino]-5-methoxyl-phenol with Pd（CH_3COO）_2,and characterized by elemental analysis,IR spectrum and single-crystal X-ray diffraction analysis.The crystal belongs to the monoclinic system,space group P2_1/c with a = 12.058（2）,b = 8.3624（17）,c = 14.735（3） ？,β = 107.66（3）°,V = 1415.7（5）？~3,C_（32）H_（32）N_2O_4Pd,Mr = 615,Z = 2,D_c = 1.443 Mg/m^3,μ = 0.695 mm^（-1）,F（000） = 632,T = 293（2） K,the final R = 0.0514 and w R = 0.1356（I 〉 2s（I））.Under the co-catalysis of methylaluminoxane（MAO）,the palladium compound exhibited favorable catalytic activity for the polymerization of norbornene（NB）.
文摘The catalytic property of propylene dimerization by several nickel (Ⅱ), cobalt (Ⅱ) complexes containing N-P bidentate ligands was studied in combination with organoaluminum co-catalysts. The effects of the type of aluminum co-catalysts and its relative amount, the nature of precursors in terms of ligand backbone and metal center were investigated. The results indicated that precursor I (N,N-dimethyl-2-(diphenylphosphino)aniline nickel (Ⅱ) dichloride) exhibited high activity in propylene dimerization in the presence of the strong Lewis acid Et3Al2Cl3, whereas low productivity by its cobalt analogues was observed under identical reaction conditions.
文摘The scalar and vector running coupling constants are derived using the renormalization group method in the σ-ω model. The numerical values of the two running coupling constants are obtained and the physical meaning of the result is discussed.
基金The project supported by the NSF(19675018)SEDC of ChinaSSTC of China
文摘The N-N <sup>1</sup>S<sub>0</sub> scattering length differences Δα<sub>CSB</sub> and Δα<sub>CIH</sub> of the charge symmetrybreaking and charge independence breaking are calculated by a resonating group method with aquark cluster model.By adding the QED-QCD interference effect to the quark mass differenceand the electromagnetic interaction,the Δα<sub>CSH</sub> and Δα<sub>CIH</sub> can be reproduced with modelparameters constrained by the hadron isomultiplet masses.
