Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Bis(8-quinolinolato)aluminum ethyl complexes: Iso-Selective Initiators for rac-Lactide Polymerization
AU - Bakewell, Clare
AU - Platel, Rachel H.
AU - Cary, Samantha K.
AU - Hubbard, Steven M.
AU - Roaf, Joshua M.
AU - Levine, Alex C.
AU - White, Andrew J. P.
AU - Long, Nicholas J.
AU - Haaf, Michael
AU - Williams, Charlotte K.
PY - 2012/7/9
Y1 - 2012/7/9
N2 - The synthesis and characterization of a series of bis(8-quinolinato)aluminum ethyl complexes, substituted at the 2-, 5-, and 7-positions on the 8-quinolinol ligand, are presented. These complexes are viable initiators for the ring-opening polymerization of rac-lactide in the presence of 1 equiv of isopropyl alcohol. The polymerization control is good, it shows a linear evolution of molecular weight as the polymerization progresses, the polylactide molecular weights are in close agreement with those determined on the basis of the reaction stoichiometry, and the polydispersity indices are narrow. The polymerization kinetics have been monitored, and the influence of the site of ligand substitution has been related to the rates. Some of the initiators show stereocontrol, producing PLA with a good probability of isotactic enchainment (P-i = 0.76).
AB - The synthesis and characterization of a series of bis(8-quinolinato)aluminum ethyl complexes, substituted at the 2-, 5-, and 7-positions on the 8-quinolinol ligand, are presented. These complexes are viable initiators for the ring-opening polymerization of rac-lactide in the presence of 1 equiv of isopropyl alcohol. The polymerization control is good, it shows a linear evolution of molecular weight as the polymerization progresses, the polylactide molecular weights are in close agreement with those determined on the basis of the reaction stoichiometry, and the polydispersity indices are narrow. The polymerization kinetics have been monitored, and the influence of the site of ligand substitution has been related to the rates. Some of the initiators show stereocontrol, producing PLA with a good probability of isotactic enchainment (P-i = 0.76).
KW - ALKYL COMPLEXES
KW - OPTICAL-PROPERTIES
KW - STEREOSELECTIVE POLYMERIZATION
KW - YTTRIUM COMPLEXES
KW - ALUMINUM COMPLEXES
KW - FLUXIONAL BEHAVIOR
KW - EPSILON-CAPROLACTONE
KW - RACEMIC LACTIDE
KW - GROUP-4 SALALEN COMPLEXES
KW - RING-OPENING POLYMERIZATION
U2 - 10.1021/om300307t
DO - 10.1021/om300307t
M3 - Journal article
VL - 31
SP - 4729
EP - 4736
JO - Organometallics
JF - Organometallics
SN - 0276-7333
IS - 13
ER -