Bimetallic aluminum complexes bearing novel spiro-phenanthrene-monoketone/OH derivatives: synthesis, characterization and the ring-opening polymerization of ε-caprolactone. Issue 22 (8th April 2021)

• Record Type: Journal Article
• Authors: Yue, Erlin; Cao, Furong; Zhang, Jun; Zhang, Wenjuan; Jiang, Youshu; Liang, Tongling; Sun, Wen-Hua
• Is Part Of: RSC advances. Volume 11:Issue 22(2021)
• Page Start: 13274
• Page End: 13281
• Publication Date: 2021-04-08
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra01288f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Bimetallic aluminum complexes bearing novel spiro-phenanthrene-monoketone/OH derivatives were synthesized, and displayed good activity toward the ring-opening polymerization of ε-caprolactone. Abstract : A series of spiro-phenanthrene-monoketone/OH derivatives (L1–L6 ) were synthesized and fully characterized with 1 H/ 13 C NMR spectroscopy and elemental analyses. By treating ligands with AlMe3, oxygen-bridged binuclear aluminum complexes (Al1–Al6 ) were isolated and characterized by 1 H/ 13 C 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 ε-caprolactone (ε-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 i Pr at the ortho -position of the arylamines demonstrated better catalytic activities than the analogs. Moreover, substituents on the backbone also affected catalytic behaviors.