Citation:
	            
		            Anita  Routaray, Nibedita  Nath, Somanath  Mantri, Tungabidya  Maharana, Alekha  Kumar Sutar. Synthesis and structural studies of copper(II) complex supported by -ONNO- tetradentate ligand: Efficient catalyst for the ring-opening polymerization of lactide[J]. Chinese Journal of Catalysis,
							;2015, 36(5): 764-770.
						
							doi:
								10.1016/S1872-2067(14)60293-X
						
					
				
					
				
	        
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	                	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.
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								Keywords:
								
 - Ring-opening polymerization,
 - Lactide,
 - Copper complex,
 - Polylactic acid
 
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