TY - JOUR
T1 - Synthesis and characterization of zinc ketoiminate and zinc alkoxide-/phenoxide-ketoiminate complexes
AU - Di Iulio, C.
AU - Middleton, M.
AU - Kociok-Kohn, Gabriele
AU - Jones, M.D.
AU - Johnson, A.L.
PY - 2013/3
Y1 - 2013/3
N2 - Dimeric methylzinc ketoiminate complexes bis{4-[(2,6-diisopropylphenyl) imido]pentan-1-one}methylzinc, [{L1}ZnMe]2, and bis{1-phenyl-3[(2,6-diisopropylphenyl)imido]butan-1-one}methylzinc, [{L 2}ZnMe]2 have been synthesized and completely characterized along with the homoleptic zinc complex bis{1-phenyl-3[(2,6- diisopropylphenyl)imido]butan-1-one}zinc, [{L2}2Zn] by means of single-crystal X-ray structure analysis and NMR spectroscopy. The related dimeric zinc phenoxide-ketoiminate complexes [{L3}Zn] 2·(dmso)2, [{L4}Zn]2· (dmso)2, [{L5}Zn]2·(dmso)2, [{L6}Zn]2·(dmso)2 and [{L 4}Zn]2·(hmpa)2 (dmso = dimethyl sulfoxide; hmpa = hexamethylphosphoramide) have also been synthesized along with the tetrameric zinc alkoxide-ketoiminate complex [{L7}Zn] 4. In preliminary studies the complexes described in this report were assessed for their activity in the ring-opening polymerization of rac-lactide, either in the solution state (in the presence of benzyl alcohol initiator), or under industrially preferred melt conditions (130 °C no solvent). It could be shown that these compounds are able to act as initiators for lactide polymerization, with molecular weights (Mn) of up to 102050 g/mol.
AB - Dimeric methylzinc ketoiminate complexes bis{4-[(2,6-diisopropylphenyl) imido]pentan-1-one}methylzinc, [{L1}ZnMe]2, and bis{1-phenyl-3[(2,6-diisopropylphenyl)imido]butan-1-one}methylzinc, [{L 2}ZnMe]2 have been synthesized and completely characterized along with the homoleptic zinc complex bis{1-phenyl-3[(2,6- diisopropylphenyl)imido]butan-1-one}zinc, [{L2}2Zn] by means of single-crystal X-ray structure analysis and NMR spectroscopy. The related dimeric zinc phenoxide-ketoiminate complexes [{L3}Zn] 2·(dmso)2, [{L4}Zn]2· (dmso)2, [{L5}Zn]2·(dmso)2, [{L6}Zn]2·(dmso)2 and [{L 4}Zn]2·(hmpa)2 (dmso = dimethyl sulfoxide; hmpa = hexamethylphosphoramide) have also been synthesized along with the tetrameric zinc alkoxide-ketoiminate complex [{L7}Zn] 4. In preliminary studies the complexes described in this report were assessed for their activity in the ring-opening polymerization of rac-lactide, either in the solution state (in the presence of benzyl alcohol initiator), or under industrially preferred melt conditions (130 °C no solvent). It could be shown that these compounds are able to act as initiators for lactide polymerization, with molecular weights (Mn) of up to 102050 g/mol.
UR - http://www.scopus.com/inward/record.url?scp=84875188960&partnerID=8YFLogxK
U2 - 10.1002/ejic.201201114
DO - 10.1002/ejic.201201114
M3 - Article
AN - SCOPUS:84875188960
SN - 1434-1948
VL - 2013
SP - 1541
EP - 1554
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 9
ER -