Premium
Synthesis and Structural Characterisation of Dinuclear Aluminium Complexes Supported by NNO‐Tridentate Schiff‐Base Ligands and Their Catalysis in the Ring‐Opening Polymerisation of ϵ‐Caprolactone
Author(s) -
Yu Xiaofeng,
Wang Zhongxia,
Han Zhiyong
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202100635
Subject(s) - chemistry , polymerization , schiff base , monomer , polymer chemistry , benzyl alcohol , catalysis , caprolactone , ligand (biochemistry) , ring opening polymerization , ring (chemistry) , medicinal chemistry , polymer , organic chemistry , biochemistry , receptor
In this study, we prepared a series of dinuclear aluminium complexes {Bis{2‐OAlMe 2 ‐3‐CH=N[CH 2 CH 2 N(CH 3 ) 2 ]‐5‐CH 3 C 6 H 2 }CH 2, Bis[2‐OAlMe 2 ‐3‐CH=N(2‐PyCH 2 )‐5‐CH 3 C 6 H 2 ]CH 2, and Bis{2‐OAlMe 2 ‐3‐CH=N[2‐N(CH 3 ) 2 C 6 H 4 ]‐5‐CH 3 C 6 H 2 }CH 2 } as well as their corresponding mononuclear aluminium compounds derived from NNO‐tridentate Schiff‐base ligands. The compounds were characterised by 1 H and 13 C spectroscopy and elemental analyses. Complexes 4 and 7 were additionally characterised by single‐crystal X‐ray diffraction. Their activities toward the ring‐opening polymerisation (ROP) of ϵ‐caprolactone (ϵ‐CL) were investigated. In the presence of benzyl alcohol (BnOH), these complexes are catalytically active for the ROP of ϵ‐CL. The kinetic studies for the polymerisation catalysed by these complexes indicated that the polymerisation was well controlled and produced polymers within a narrow molecular weight distribution. At low monomer concentrations, the catalytic activity of binuclear complexes is considerably greater than that of mononuclear complexes.