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Aminophenolates of aluminium, gallium and zinc: Synthesis, characterization and polymerization activity
Author(s) -
Basiak Dariusz,
Dobrzycki Łukasz,
Socha Paweł,
Rzepiński Patryk,
Plichta Andrzej,
Bujnowski Krzysztof,
Synoradzki Ludwik,
Orłowska Natalia,
Ziemkowska Wanda
Publication year - 2017
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3748
Subject(s) - chemistry , gallium , zinc , alkyl , polymerization , aluminium , monomer , polymer chemistry , metal , phenol , crystal structure , medicinal chemistry , stereochemistry , crystallography , polymer , organic chemistry
Complexes containing aminophenolate ligands are considered as very efficient initiators of ring‐opening polymerization (ROP). Our systematic studies of the reactions of two selected aminophenols, 2‐[( p ‐tolylamino)methyl]‐4‐(2,4,4‐trimethylpentan‐2‐yl)phenol (L'H 2 ) and 2‐cyclohexylaminomethyl‐4‐methylphenol (L″H 2 ), with alkyl compounds of aluminium, gallium and zinc resulted in the formation of a variety of products depending on the type of metallic centre and alkyl groups bonded to metal atoms. New trinuclear aluminium complexes (Me 5 Al 3 (L′) 2 ( 1 ) and Me 5 Al 3 (L″) 2 ( 2 )), monomeric aluminium ( t Bu 2 Al(L'H) ( 3 ) and t Bu 2 Al(L″H) ( 5 )) and gallium ( t Bu 2 Ga(L'H) ( 4 ) and t Bu 2 Ga(L″H) ( 6 )) compounds, and dinuclear gallium (Et 2 Ga(L″H)·Et 3 Ga ( 7 )) and zinc ( t BuZn(L″H)] 2 ( 8 )) complexes were isolated and characterized. The molecular and crystal structures of 7 and 8 were determined on the basis of an X‐ray diffraction study. Polymerization tests showed that only three complexes ( 6 – 8 ) had activity in the ROP of ε ‐caprolactone, whereas 1 – 5 were inactive in ROP.