Mi-Sung Kang, Juhyun Cho, S. Nayab
Jan 1, 2019
Citations
0
Influential Citations
7
Citations
Journal
Polyhedron
Abstract
Abstract A series of Zn(II) and Cu(II) complexes based on (chiral substituent)(diethyl)-ethanediamine derivatives, [LnMCl2] (where Ln = [(R)-N1,N1-diethyl-N2-(1-phenylethyl)ethane-1,2-diamine] (LA), [(R)-N1-(1-cyclohexylethyl)-N2,N2-diethylethane-1,2-diamine] (LB) and [N1,N1-diethyl-N2-(((1R)-6,6-dimethylbicyclo[3.1.1]hept-2-en-2-yl)methyl)ethane-1,2-diamine] (LC)) were synthesised and characterised by X-ray crystallography. The isopropoxide derivatives, [LnM(OiPr)2] generated in situ, effectively polymerised rac-lactide (rac-LA) and yielded heterotactic polylactide (PLA). The Cu(II) initiators exhibited better catalytic activities and mediated stereoselective ring-opening polymerisation (ROP) of rac-LA in a living manner to furnish PLA with higher heterotacticity compared with their Zn(II) analogous. The ROP activity of the current system largely relies on steric hindrance imposed by the substituents attached to the amine moiety of the (diethyl)-ethanediamine backbone.