Issue 4, 2013
From the journal:

New Journal of Chemistry

Imino phenoxide complexes of group 4 metals: synthesis, structural characterization and polymerization studies†

Tanmoy Kumar Saha,a   Mrinmay Mandal,a   Debashis Chakraborty*a  and  Venkatachalam Ramkumara  

* Corresponding authors

a Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
E-mail: dchakraborty@iitm.ac.in
Fax: +91 44 2257 4202
Tel: +91 44 2257 4223

Abstract

A complete library of new alkoxides containing group 4 metals and the imino phenol ligand were synthesized in high yields and purity. These compounds showed catalytic activity towards the polymerization of L-lactide (L-LA), rac-lactide (rac-LA), ε-caprolactone (CL), δ-valerolactone (VL), rac-β-butyrolactone (rac-BL), ethylene and propylene. The zirconium catalysts were found to yield better polymerization results in comparison to the titanium and hafnium analogues. The number average molecular weight (Mn) values of the polymers are very high for LA and CL with controlled molecular weight distributions (MWDs). Analyses of MALDI-TOF and 1H NMR spectra of low Mn oligomers reveal that the ligand initiates the ring-opening polymerization (ROP). For ethylene and propylene polymerization, we have achieved moderate to good activity using MAO as a co-catalyst.

Graphical abstract: Imino phenoxide complexes of group 4 metals: synthesis, structural characterization and polymerization studies

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Article information

DOI
https://doi.org/10.1039/C3NJ40916C
Article type
Paper
Submitted
11 Oct 2012
Accepted
08 Jan 2013
First published
09 Jan 2013

New J. Chem., 2013,37, 949-960

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Imino phenoxide complexes of group 4 metals: synthesis, structural characterization and polymerization studies

T. K. Saha, M. Mandal, D. Chakraborty and V. Ramkumar, New J. Chem., 2013, 37, 949 DOI: 10.1039/C3NJ40916C

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