Cobalt(II) and cobalt(III) complexes of tripodal tetradentate diamino-bis(phenolate) ligands: Synthesis, characterization, crystal structures and evaluation in radical polymerization processes

Autor: Maxime Michelas, Yasmine K. Redjel, Jean-Claude Daran, Meriem Benslimane, Rinaldo Poli, Christophe Fliedel
Přispěvatelé: Laboratoire de chimie de coordination (LCC), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale (CHEMS), Université frères Mentouri Constantine I (UMC), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Ministère de l’Enseignement Supérieur et de la Recherche Scientifique, France, Centre National de la Recherche Scientifique (CNRS, France), Institut Universitaire de France (IUF, France), ANR-19-CE07-0031,POLYSWITCH,Commutation de mécanisme de polymérisation par des complexes de coordination(2019)
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Inorganica Chimica Acta
Inorganica Chimica Acta, 2023, 549, pp.121408. ⟨10.1016/j.ica.2023.121408⟩
ISSN: 0020-1693
Popis: International audience; The synthesis and characterization of cobalt(II) (3, 4) and acetato cobalt(III) (5) complexes with two tripodal tetradentate diamino-bis(phenolate) ligands (L1 and L2) are reported. The solid-state structures of proligand H2L1 and complexes 4 and 5 were determined by X-ray crystallography. Complex 4 crystallizes as a dimer via the formation of a Co2O2 core. Complex 5 is monomeric with a six-coordinated cobalt(III) center bearing a chelating acetate ligand. In both structures, the diamino-bis(phenolate) ligand (L1 or L2) is acting as a tetradentate dianionic κ4-(O2,N2) chelating ligand. The diamagnetic nature of complex 5 allowed its characterization by multinuclear NMR spectroscopic techniques. Complex 5 is not a competent unimolecular initiator for the radical polymerization of methyl acrylate or methyl methacrylate. Its cobalt(II) analog (3) did not act as an efficient OMRP moderator for the radical polymerization of activated (styrene, tert-butyl acrylate) and non-activated (vinyl acetate) monomers.
Databáze: OpenAIRE