Comparing a series of 8-quinolinolato complexes of aluminium, titanium and zinc as initiators for the ring-opening polymerization of rac-lactide.
The preparation and characterization of a series of 8-hydroxyquinoline ligands and their complexes with Ti(IV), Al(III) and Zn(II) centres is presented. The complexes are characterized using NMR spectroscopy, elemental analysis and, in some cases, by single crystal X-ray diffraction experiments. The complexes are compared as initiators for the ring-opening polymerization of racemic-lactide; all the complexes show moderate/good rates and high levels of polymerization control. In the case of the titanium or aluminium complexes, moderate iso-selectivity is observed (Pi = 0.75), whereas in the case of the zinc complexes, moderate hetero-selectivity is observed (Ps = 0.70).
Department of Chemistry, Imperial College London, London SW7 2AZ, UK. c.k.williams@imperial.ac.uk n.long@imperial.ac.uk.
Clare
C
Bakewell
Giovanna
G
Fateh-Iravani
Daniel W
DW
Beh
Dominic
D
Myers
Sittichoke
S
Tabthong
Pimpa
P
Hormnirun
Andrew J P
AJ
White
Nicholas
N
Long
Charlotte K
CK
Williams