期刊文献+
共找到8篇文章
< 1 >
每页显示 20 50 100
A Diphenoxo-bridged Ferromagnetic Copper(Ⅱ) Dimer Based on N-(2-Hydroxybenzyl)salicylaldimine
1
作者 杨春 王庆伦 +3 位作者 唐国涛 孙平 许公峰 廖代正 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2009年第5期636-640,共5页
A new dinuclear copper(Ⅱ) complex, [Cu(L)(py)]2 1 (H2L = N-(2-hydroxybenzyl)- salicylaldimine, py = pyridine), has been synthesized and characterized by elemental analysis, IR and UV spectra. 1 crystallizes... A new dinuclear copper(Ⅱ) complex, [Cu(L)(py)]2 1 (H2L = N-(2-hydroxybenzyl)- salicylaldimine, py = pyridine), has been synthesized and characterized by elemental analysis, IR and UV spectra. 1 crystallizes in space group P2 1/n with a = 8.2106, b = 10.715, c = 17.864A, β = 99.365°, V = 1550.7A3, Z = 4, C19H16CuN2O2, Mr = 367.88, Dc = 1.576 g/cm3,μ(MoKα) = 1.422 mm-1, F(000) = 756, the final R = 0.0280 and wR = 0.0746. Complex 1 is a centrosymmetric dimer with two copper(H) centers, two py ligands and two L2- ligands. Each L2- ligand donates its azomethine nitrogen and one of the phenolate groups to one copper(Ⅱ) ion and shares the other phenolate group between the two copper(H) ions, affording a Cu2O2 plane. Each copper(Ⅱ) center has a slightly distorted square pyramidal geometry with a bridging phenolate group at the apex. Magnetic studies suggest the presence of a weak ferromagnetic interaction Via two phenoxo bridges. The magnetic susceptibility data (2-300 K) of complex 1 were analyzed by means of H = -2JS1S2 -DSz. The least-squares fitting of the data to the theoretical equation leads to J = 10.3 cm-1, g = 2.03, D = 0.67 cm-1 and R = ∑(Xobsd -Xcalcd)2/∑Xobsd2= 2.76 × 10^-3. 展开更多
关键词 copper(Ⅱ) dimer N-(2-hydroxybenzyl)salicylaldimine tridentate Schiff baseligand crystal structure ferromagnetic interaction
下载PDF
A“Catalyst+Support”Strategy for Salicylaldimine Nickel Catalyzed Ethylene Polymerization and Copolymerization with Polar Monomers
2
作者 WANG Zihao YANG Lei +2 位作者 XU Mengli TAN Chen CHEN Changle 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2023年第5期726-730,共5页
Polyolefins,as one of the most productive synthetic polymer materials,have been widely used in industry and daily life[1-2].However,due to their"non-polar"nature,polyolefins have poor compatibility and adhes... Polyolefins,as one of the most productive synthetic polymer materials,have been widely used in industry and daily life[1-2].However,due to their"non-polar"nature,polyolefins have poor compatibility and adhesion to polar materials,limiting their application in many fields[3-5]. 展开更多
关键词 NICKEL salicylaldimine Polar monomer POLYOLEFIN Heterogeneous
原文传递
Self-assembly as a route to one-dimensional lanthanum(Ⅲ) salicylaldimine coordination polymer 被引量:1
3
作者 Wanda Radecka-Paryzek Izabela Pospieszna-Markiewicz Maciej Kubicki 《Journal of Rare Earths》 SCIE EI CAS CSCD 2010年第S1期51-55,共5页
The self-assembled formation of a one-dimensional lanthanum salicylald imine coordination polymer was proved by the X-ray diffraction analysis of new l anthanum(Ⅲ) nitrate complex containing N,N’-bis(salicylidene)-1... The self-assembled formation of a one-dimensional lanthanum salicylald imine coordination polymer was proved by the X-ray diffraction analysis of new l anthanum(Ⅲ) nitrate complex containing N,N’-bis(salicylidene)-1,5-pentanediami ne ligand(H2L) . It was obtained in situ in a one-step,metal-templated condensa tion of salicylaldehyde with 1,5-pentanediamine(cadaverine,biogenic polyamine) and characterized by microanalysis and spectroscopic(IR,ESI-MS,UV-Vis,and 1 H NMR) data. The [La(NO3) 3(μ-H2L) 2]∞ complex displayed 10-coordinate distorted bicapped dodecahedron geometry with unusual coordination pattern of undeprotonat ed salicylaldimines which acted as μ-bridging ditopic ligands using exclusivel y the oxygens as donor atoms with the nitrogen atoms not being involved in the c oordination environment. 展开更多
关键词 self assembly LANTHANUM salicylaldimine crystal structure coordina tion polymer rare earths
原文传递
Copper-catalyzed Ullmann-type synthesis of diaryl ethers assisted by salicylaldimine ligands
4
作者 Cun-Wei Qian Wen-Lin Lv +2 位作者 Qian-Shou Zong Mao-Yuan Wang Dong Fang 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第2期337-340,共4页
A series of salicylaldimine ligands were designed to promote the copper-catalyzed Ullmann cross- coupling reaction. After a screening process, 2-((2-isopropylphenylimino)methyl)phenol was found to serve as a good ... A series of salicylaldimine ligands were designed to promote the copper-catalyzed Ullmann cross- coupling reaction. After a screening process, 2-((2-isopropylphenylimino)methyl)phenol was found to serve as a good supporting ligand for this reaction. Employing this Schiff-base ligand as a new supporting ligand, the copper-catalyzed coupling reactions of aryl bromides and aryl iodides with various phenols successfully proceeded in good yields under mild conditions. Various diaryl ethers were obtained with excellent yields in dioxane in the presence of K3P04 and a catalytic amount of copper(I) salt. 展开更多
关键词 Copper catalyst salicylaldimine ligands Ullmann coupling Diaryl ethers
原文传递
Synthesis and Characterization of {2-Formyl-6-[1-(2,4,6-trimethylphenyl)]-4- chlorophenoxy}_2Ni and Its Ethylene Oligomerization
5
作者 ZHANG Dong-Heng DU Jian-Long +1 位作者 HAN Ling-Qin SUN Wen-Hua 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2005年第8期930-934,共5页
The title nickel complex (C34H3oCl2N2NiO4, Mr = 660.21) has been synthesized and its crystal structure was determined by single-crystal X-ray structure analysis. It crystallizes in the monoclinic system, space group... The title nickel complex (C34H3oCl2N2NiO4, Mr = 660.21) has been synthesized and its crystal structure was determined by single-crystal X-ray structure analysis. It crystallizes in the monoclinic system, space group P21/n with a = 11.026(8), b = 11.491(8), c = 12.119(9) A°, β=91.328(13)°, Z= 2, V= 1535.0(19) ,A°^3, Dc = 1.428 g/cm^3, F(000) = 684 andμ(MoKa) = 0.848 mm^-1 The structure was refined to R = 0.0544 for 1813 observed reflections with I 〉 2σ(I) and wR =0.0867 for 3132 unique reflections. The molecule of the complex is high symmetrical. Ni(Ⅱ) atom is located in the symmetric center and coordinated to two phenolic oxygen and two imino nitrogen atoms, forming two six-membered rings. Upon activation with methylaluminoxane (MAO), it is active for ethylene oligomerization. 展开更多
关键词 nickel complex salicylaldimine ethylene oligomerization
下载PDF
Ni(acac)_(2)Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands:An Effective Strategy to Access Soluble Polynorbornenes
6
作者 Liang Fang Chun-Yu Zhang +3 位作者 Xue-Quan Zhang Xian-De Shen Heng Liu Toyoji Kakuchi 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第3期356-364,I0006,共10页
Late transition metals have long served as workhorses for vinyl polymerization of norbornene derivatives.Nevertheless,for such catalytic systems,insoluble polynorbornene(PNB)products are often produced which hampers t... Late transition metals have long served as workhorses for vinyl polymerization of norbornene derivatives.Nevertheless,for such catalytic systems,insoluble polynorbornene(PNB)products are often produced which hampers their further detailed characterizations,such as molecular weights,polydispersities,stereoregularities,etc.In this work,we surprisingly found that for a traditional Ni(acac)_(2)/MAO system that was previously reported to give insoluble PNBs,incorporation of highly bulk salicylaldiminate ligands could significantly improve the solubility of the PNBs in common organic solvents,which allowed for subsequent thorough detailed analysis of the polymer products.Moreover,it was also observed that high-temperature polymerization was beneficial for further improving the PNB’s solubilities due to the decreased molecular weights and stereoregularities.Different ligand skeletons and ligand equivalents were also investigated to give a comprehensive view of their influences on the polymers’solubilities,and based on these results,a plausible mechanism that caused such a big difference was tentatively proposed. 展开更多
关键词 POLYNORBORNENE Salicylaldiminate ligand Vinyl polymerization
原文传递
Spectral Characterization and Antimicrobial Activity of Some Schiff Bases Derived from 4-Chloro-2-aminophenol and Various Salicylaldehyde Derivatives 被引量:1
7
作者 Cinarli, Adem Gurbuz, Demet +1 位作者 Tavman, Aydin Birteksoz, A. Seher 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第2期449-459,共11页
A series of N-(5-chloro-2-hydroxyphenyl)-(3/4/5-substituted)-salicylaldimines (I--XI) were synthesized using appropriate synthetic route. Their structures were characterized by FT-IR, UV-Visible, ESI-MS, 1H and ... A series of N-(5-chloro-2-hydroxyphenyl)-(3/4/5-substituted)-salicylaldimines (I--XI) were synthesized using appropriate synthetic route. Their structures were characterized by FT-IR, UV-Visible, ESI-MS, 1H and 13C NMR spectroscopic techniques and analytical methods. The crystal structure of N-(5-chloro-2-hydroxyphenyl)-5-bromo- salicylaldimine (V) was determined by X-ray diffraction at room temperature. Relationship between the melting points and the structures of the compounds was examined. Antimicrobial activity of the compounds was evaluated against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus mirabilis. Antifungal activities were reported for Candida albicans. Schiff bases showed considerable antimicrobial activity against S. aureus, S, epidermidis and C. albicans. N-(5-Chloro-2-hydroxyphenyl)-3-hydroxy-salieylaldimine (II) has the broadest and highest antimicrobial activity according to the others. 展开更多
关键词 salicylaldimine SCHIFFBASES X-ray diffraction spectroscopy ANTIMICROBIAL
原文传递
Highly Efficient and Thermal Robust Cobalt Complexes for 1,3-Butadiene Polymerization 被引量:2
8
作者 Liang Fang Wen-Peng Zhao +4 位作者 Chun-Yu Zhang Xue-Quan Zhang Xian-De Shen Heng Liu Toyoji Kakuchi 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2022年第11期1369-1379,共11页
A family of highly bulky bis(salicylaldiminate)Co(Ⅱ)complexes bearing cavity-like conformations are disclosed herein.Due to their unique bulky nature around the cobalt atoms that are reflected from space-filling mode... A family of highly bulky bis(salicylaldiminate)Co(Ⅱ)complexes bearing cavity-like conformations are disclosed herein.Due to their unique bulky nature around the cobalt atoms that are reflected from space-filling models and the buried volume percentages,obviously longer bond distances of Co―N and Co―O are revealed from those complexes.Moreover,because of these well-protected active species,the cobalt complexes are able to catalyze 1,3-butadiene polymerization in high yields at extreme low catalyst concentrations,revealing a ultra high catalytic efficiency.At a ratio of 50000,all the complexes can afford polybutadiene with yields higher than 90%.Furthermore,the highly steric bulkiness of the ligand can also significantly enhance the thermostability of the active species.At temperature of 80-120°C,the complexes are able to successfully maintain high activities,giving polymer yields up to 90%. 展开更多
关键词 Butadiene polymerization Bis(salicylaldiminate)Co(Ⅱ)complexes Ultra high catalytic efficiency
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部