Journal
RSC ADVANCES
Volume 11, Issue 22, Pages 13274-13281Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra01288f
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Funding
- National Natural Science Foundation of China [51973005, 21871275]
- Yan'an High-level Talents Special Foundation [2019-33]
- Doctoral Scientific Research Startup Project of Yan'an University [YDBK2019-22]
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A series of novel compounds were synthesized and their catalytic properties for ring-opening polymerization were studied, showing that some complexes exhibited high catalytic activities. The type and position of substituents on the complexes could influence their catalytic behaviors.
A series of spiro-phenanthrene-monoketone/OH derivatives (L1-L6) were synthesized and fully characterized with H-1/C-13 NMR spectroscopy and elemental analyses. By treating ligands with AlMe3, oxygen-bridged binuclear aluminum complexes (Al1-Al6) were isolated and characterized by H-1/C-13 NMR spectroscopy. The molecular structures of ligands (L2, L4 and L5) and complex Al1 were determined by single crystal X-ray diffraction. In the presence of benzyl alcohol (BnOH), these aluminum complexes demonstrated high efficiency towards the ring-opening polymerization of epsilon-caprolactone (epsilon-CL), resulting in PCL in a linear manner with the BnO-end group. In addition, complexes Al1 and Al5 exhibited good catalytic activities even without BnOH. Moreover, complexes Al3 and Al6 with the bulkier substituent of Pr-i at the ortho-position of the arylamines demonstrated better catalytic activities than the analogs. Moreover, substituents on the backbone also affected catalytic behaviors.
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