title: Monomeric and dimeric Al(iii) complexes for the production of polylactide.
abstract: A series of monometallic and bimetallic Al(iii) complexes with substituted naphthyl based Schiff base ligands have been prepared and characterised. When 1-aminonaphthalene based ligands were reacted with AlMe3 monometallic complexes were isolated, however, with 1,5 and 1,8-diaminonaphthalene based ligands bimetallic complexes were formed. In all cases 4-coordinate tetrahedral Al(iii) centres were observed in the solid state and in solution. There was little difference in rate of polymerisation of rac-lactide between the monometallic and bimetallic complexes based on 1,5-diaminonaphthalene. However, for the 1,8-diaminonaphthalene the complex was an order of magnitude faster than the monometallic and the analogous 1,5-system. Moreover, this complex was active at room temperature, which is rare for aluminium initiators, and PLA with a high degree (Pm = 0.82) of isotacticity was observed.
authors: Doctoral Training Centre in Sustainable Chemical Technologies, University of Bath, Bath BA2 7AY, UK.
authors: Sarah M
authors: SM
authors: Kirk
authors: Helena C
authors: HC
authors: Quilter
authors: Antoine
authors: A
authors: Buchard
authors: Lynne H
authors: LH
authors: Thomas
authors: Gabriele
authors: G
authors: Kociok-Kohn
authors: Matthew D
authors: MD
authors: Jones
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D008024:Ligands; D015394:Molecular Structure; D009281:Naphthalenes / Q000138:chemical synthesis* / Q000737:chemistry; D011091:Polyesters / Q000138:chemical synthesis* / Q000737:chemistry; D058105:Polymerization; D012545:Schiff Bases / Q000737:chemistry*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D056831:Coordination Complexes; D008024:Ligands; D009281:Naphthalenes; D011091:Polyesters; D012545:Schiff Bases; C033616:poly(lactide); D000535:Aluminum