484062-92-2Relevant academic research and scientific papers
Preparation of zirconium and hafnium complexes containing chiral N atoms from asymmetric tertiary amine ligands, and their catalytic properties for polymerization of rac-lactide
Hu, Minggang,Han, Fuzhong,Zhang, Wenzhi,Ma, Wenhui,Deng, Qigang,Song, Weiming,Yan, Hailong,Dong, Guohua
, p. 1394 - 1403 (2017)
A series of N-(2-pyridylmethyl)-N,N-bis(2′-hydroxy-benzyl) amine ligands were synthesized, and the new asymmetric tertiary amine ligands reacted with ZrCl4 and HfCl4 to give complexes 1-6. The chiral N atoms were created in the complexes upon coordination of the asymmetric tertiary amine ligands to the metal centers. The complexes were used as catalysts for ring-opening polymerization of rac-lactide. The results show that the substituents and structure of the ligands have effects on the activity and stereoselectivity of the catalyst. The stereoselectivity was promoted by the complex containing the ligand with the electron-withdrawing group. Complex 3, with bulkier cumyl groups on the ligand, possesses better stereoselectivity. The complexes are able to catalyze the living control ring-opening polymerization of rac-lactide to afford isotactic-rich polylactide with narrow molecular weight distribution. Kinetic studies reveal that polymerization is of the first order in both monomer and catalyst. The microstructure of the resulting polymer is determined by 1H NMR homonuclear decoupled spectra. The results show that the isotactic-rich chain is dominant in the prepared polylactide. The Pm value is in the range of 0.67-0.81.
Platinum(II) and Copper(II) complexes of asymmetric halogen-substituted [NN?O] ligands: Synthesis, characterization, structural investigations and antiproliferative activity
Amiri Rudbari, Hadi,Saadati, Arezoo,Aryaeifar, Mahnaz,Blacque, Olivier,Cuevas-Vicario, Jose V.,Cabral, Rui,Raposo, Luis R.,Fernandes, Alexandra R.
, (2021/12/27)
In order to better understand the effect of structure, halogen substitution, metal ions and ligand flexibility on antiproliferative activity, eight Cu(II) complexes and eight Pt(II) complexes were obtained of 2,4-X1,X2-6-((pyridine-2
Preparation method and application of Asymmetric N-O ligand and Ti, Zr and Hf complex
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Paragraph 0037, (2016/10/10)
The invention discloses a preparation method and application of asymmetric N-O ligand and Ti, Zr and Hf complex. The preparation method of the complex comprises the following steps: preparing asymmetric N-O ligand from substituted salicylaldehyde with 2-(
