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Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide

ABSTRACT: Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV–Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phe...

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Autores principales: Mandal, Mrinmay, Oppelt, Kerstin, List, Manuela, Teasdale, Ian, Chakraborty, Debashis, Monkowius, Uwe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Vienna 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5063905/
https://www.ncbi.nlm.nih.gov/pubmed/27795584
http://dx.doi.org/10.1007/s00706-016-1830-7
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author Mandal, Mrinmay
Oppelt, Kerstin
List, Manuela
Teasdale, Ian
Chakraborty, Debashis
Monkowius, Uwe
author_facet Mandal, Mrinmay
Oppelt, Kerstin
List, Manuela
Teasdale, Ian
Chakraborty, Debashis
Monkowius, Uwe
author_sort Mandal, Mrinmay
collection PubMed
description ABSTRACT: Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV–Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes. All complexes are able to catalyze the ring-opening polymerization of rac-lactide yielding polymers with moderate molecular weights and moderately broad molecular weight distributions. GRAPHICAL ABSTRACT: [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00706-016-1830-7) contains supplementary material, which is available to authorized users.
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spelling pubmed-50639052016-10-28 Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide Mandal, Mrinmay Oppelt, Kerstin List, Manuela Teasdale, Ian Chakraborty, Debashis Monkowius, Uwe Monatsh Chem Original Paper ABSTRACT: Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV–Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes. All complexes are able to catalyze the ring-opening polymerization of rac-lactide yielding polymers with moderate molecular weights and moderately broad molecular weight distributions. GRAPHICAL ABSTRACT: [Image: see text] ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00706-016-1830-7) contains supplementary material, which is available to authorized users. Springer Vienna 2016-09-05 2016 /pmc/articles/PMC5063905/ /pubmed/27795584 http://dx.doi.org/10.1007/s00706-016-1830-7 Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Original Paper
Mandal, Mrinmay
Oppelt, Kerstin
List, Manuela
Teasdale, Ian
Chakraborty, Debashis
Monkowius, Uwe
Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
title Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
title_full Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
title_fullStr Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
title_full_unstemmed Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
title_short Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
title_sort copper(ii) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5063905/
https://www.ncbi.nlm.nih.gov/pubmed/27795584
http://dx.doi.org/10.1007/s00706-016-1830-7
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