761456-48-8Relevant academic research and scientific papers
A Series of Novel Dendritic Salicylaldimine Iron Catalysts: Synthesis, Characterization, and Application in Ethylene Oligomerization
Jun Wang,Shang, Yiteng,Zhang, Na,Li, Cuiqin,Shi, Weiguang
, p. 2618 - 2627 (2018)
Abstract: A series of novel dendritic salicylaldimine ligands and their corresponding iron complexes have been synthesized using 1.0 generation (1.0 G) dendritic macromolecules, salicylaldehyde and FeCl2 · 4H2O as raw materials. The structures of the ligands and iron complexes were characterized by FT-IR, 1H NMR, UV, ESI-MS, and elemental analysis. The dendritic salicylaldimine iron complexes presented moderate catalytic activity in ethylene oligomerization and selectivity for higher carbon number olefins products (≥C8) when they were activated with methylaluminoxane (MAO). The catalytic activity and product selectivity were related to the co-catalyst, solvent, bridged group length and reaction parameters such as reaction temperature, Al/Fe molar ratio and ethylene pressure. The complex C3 showed the highest catalytic activity (up to 13.75 × 104 g (mol Fe h)–1) and the selectivity of higher carbon number olefins (35.31%) at the optimized conditions. Moreover, the catalytic properties of dendritic salicylaldimine iron complex C3 was better than non-dendritic iron complex.
Preparation and mimic enzyme catalytic kinetics of dendritic copper complex
Wang, Jun,Yang, Guang,Li, Cuiqin,Zhangi, Peng
, p. 407 - 412 (2015/01/30)
A new kind of dendritic-salicylaldehydeimine ligand was synthesized using 1.0G polyamidoamine and salicylaldehyde as raw materials through Schiff reaction and further formed dendritic copper complex by Cu complex ion. The structures of dendritic ligand and its copper complex were characterized by elemental analysis, IR, NMR, UV and XRD. With H2O2 as the oxidant, the oxidation reaction performance of dendritic copper complex catalyzing ascorbic acid was determinated by spectrophotometry and catalytic kinetic model was established. The influences of catalytic reaction order, pH value of buffer and complexes concentration on catalytic reaction rate constant were investigated. Results showed that the dendritic copper complex had good mimic enzyme activity. The catalytic reactions had the same features of pseudo-first-order reaction to enzymatic reaction. The catalytic reaction rate obviously imcreased under the conditions of higher concentration of mimic enzyme complex and pH = 7-7.5.
