Open AccessSynthesis, Characterization of Zinc Complexes with Neutral ?-Diimine Ligands and Application in Ring-opening Polymerization of ?-Caprolactone
Author(s) -
Xiaodan Wang,
Xuehong Liu,
Ju Huang
Publication year - 2017
Publication title -
chimia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.387
H-Index - 55
eISSN - 2673-2424
pISSN - 0009-4293
DOI - 10.2533/chimia.2017.773
Subject(s) - diimine , chemistry , monomer , steric effects , zinc , polymerization , caprolactone , polymer chemistry , ring opening polymerization , amine gas treating , polar effect , diacetyl , medicinal chemistry , catalysis , organic chemistry , polymer
A series of neutral ?-diimine ligands with diacetyl and acenaphthenequinone skeletons were prepared by the reaction between diacetyl and the corresponding aromatic amine. These ligands reacted with ZnCl2 to generate symmetric ?-diimine zinc complexes C1–C10. Experimental results indicated that the ?-diimine zinc complexes with a diacetyl skeleton (C1–C4) were active in ring-opening polymerization (ROP) of ?-caprolactone (?-CL). The complexes with an acenaphthenequinone skeleton showed a small steric effect (C5, C8 and C9) but the complex substituted with an electron-withdrawing group (C10) showed high activity in the monomer conversion rate during ROP of ?-CL. The ROP catalysts of ?-CL demonstrated the mechanism of monomer activation in the presence of benzyl alcohol.