Novel aluminum, zinc and titanium complexes supported by diamino-bis(benzotriazole phenoxide) ligands for ring-opening polymerization of e-caprolactone
| Autor: | Zheng-Tang Liu, 劉正堂 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 Two novel diamino-bis(benzotriazole phenoxide) ligands(amineDiBTP-H2), C8MEADiBTP-H2 (A) and C8BEADiBTP-H2 (B) have been prepared by the Mannich condensation of 2-(2H-benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol with the mixtures of excess paraformaldehyde and primary diamine in ethanol under reflux conditions. Catalysts bearing the C8MEADiBTP and C8BEADiBTP ligands have been synthesized and structurally characterized. The reaction of amineDiBTP-H2 with Ti(OiPr)4 (1.0 mol equiv.) produced the mono-adduct complexes [(C8MEADiBTP)Ti(OiPr)2] (1) and [(C8BEADiBTP)Ti(OiPr)2] (2),. Further reaction of C8BEADiBTP-H2 with AlMe3 produced the tetra-coordinated dinuclear aluminum complex [(C8BEADiBTP)Al2Me4] (3).And [(C8BEADiBTP)Zn2Et2] (4) can be obtained by the treatment of ZnEt2 with 2.0 molar equiv of C8BEADiBTP-H2 in CH2Cl2, respectively. Experimental results indicate that complex 4 is efficient catalyst for polymerization of -caprolactone in a controlled manner, yielding polymers with the expected molecular weights and narrow polydispersity indices (PDIs) values (Mw/Mn < 1.14). |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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