Monometalic and bimetalic Schiff base Al complexes for Polymerization of -caprolactone: synthesis, characterization and catalysis behaviour.

A two of monomeric and dimeric Al(III) catalysts with substituted 4,4 -Methylenebis(2,6-diisopropylaniline) based Schiff base ligands with 3,5-Di-tert-butylsalicylaldehyde two equivalents and one equivalent to produce L1 and L2 respectively. When L1 was reacted with two mole of trimethyl aluminium dimetallic complex was isolated, while L2 reacted with one equivalent of trimethyl aluminium formed monometallic complex. All ligands and complexes have been synthesised and characterised.The polymerization of -caprolactone initiated by complexes 1and 2 in the presence of benzylalcohol showed living features, affording PCL with narrow(PDIs) was observed.

Keywords:

monomeric and dimeric Al(III) complexes , bis-schiffbase , ε-caprolactone , ring opening polymerization(ROP)