Highly efficient iron(II) catalysts toward ring opening polymerization of ε-caprolactone through in situ initiation
| Autor: | Shengdong Wang, Qiuyue Zhang, Wang Rui, Wen-Hua Sun, Dou Jinxi, Xiuqin Zhang, Dongzhi Zhu, Wenjuan Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Denticity
010405 organic chemistry Tetrahedral molecular geometry 010402 general chemistry 01 natural sciences Ring-opening polymerization 0104 chemical sciences Catalysis Inorganic Chemistry chemistry.chemical_compound chemistry Polymerization Alkoxide Polymer chemistry Materials Chemistry Proton NMR Physical and Theoretical Chemistry Caprolactone |
| Zdroj: | Inorganica Chimica Acta. 488:299-303 |
| ISSN: | 0020-1693 |
| DOI: | 10.1016/j.ica.2019.01.040 |
| Popis: | A series of N,N'-bidentate iron(II) complexes (Fe1-Fe5) bearing 4-arylimino-1,2,3-trihydroacridines were prepared by one pot reaction of 2,3-dihydroacridin-4-one, corresponding anilines and FeCl2·4H2O. All these complexes were characterized by FT-IR spectroscopy and elemental analysis, while single crystal of Fe5 was the interest for X-ray analysis, revealed tetrahedral geometry around iron center. In the presence of tetradecanol, the catalysts system Fe1-Fe5/2LiCH2SiMe3 exhibited high efficiency toward ring opening polymerization of e-CL at room temperature; a rare example of iron(II) complexes for ROP of cyclic ester at such lower temperature compared to common efficient iron(III) precatalysts. The 1H NMR spectra and MALDI-TOF analysis of the resultant PCL displayed as an evident for linear structure capped with tetradecylalkoxy. Therefore, polymerization proceeded through coordination-insertion mechanism in which the iron(II) alkoxide generated in situ acted as the active species. |
| Databáze: | OpenAIRE |
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