科研之友
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摘要
The –ONNO– tetradentate Schiff base ligand N,N’-bis(2-hydroxy-3- methoxybenzaldehyde) benzene-1,2-diamine(HMBBD) has been synthesized. The ligand was attached to copper(Cu-HMBBD) in methanol under N2 atmosphere to give a mononuclear complex. The reactivity of this complex in the ring-opening polymerization(ROP) of lactide has been studied. The complex has a square planner geometry, as determined by X-ray diffraction studies. The copper complex is highly active towards the ring-opening polymerization of lactide, and the rate of polymerization is heavily dependent on the initiator used. The copper complex allows controlled ring-opening polymerization, as shown by the linear relationship between the percentage conversion and the number average molecular weight. Based on the literature, a mechanism for the ROP of lactide has been proposed.
