Synthesis,structures,and catalytic activity of aluminum and zinc complexes chelated by 2-((2,6-dimethylphenyl)amino)ethanolate
Treatment of ArNHCH2CH2OH(HL,Ar=2,6-Me2C6H3)with AlMe3 and ZnEt2 resulted in the formation of a bi-aluminum complex,[(Me2Al)(L)]2(1),and a tetra-zinc complex,[EtZn2(L)3]2(2),respectively.They were charac-terized by elemental analysis,NMR,and single-crystal X-ray diffraction analysis.Complex 1 is a crystallographically centrosymmetric dimer with an Al2O2 core in the solid state,while a Zn4O6 core is observed in 2,which can be viewed as two side-by-side cubes missing a pair of opposite vertices.Preliminary catalytic activity tests indicated that the aluminum complex 1 was inactive for the ring-opening polymerization(ROP)of ε-caprolactone,while the zinc complex 2 was a highly active initiator for the ROP of ε-caprolactone and could control the molecular weight distribution of the resulted polymers in narrow ranges.CCDC:2304200,1;2304201,2.
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