Synthesis of cobalt(II)-a-diimines complexes and their activity as mediators in organometallic mediated radical polymerization of vinyl acetate.
RIGA, Beatriz A.; NEVES, Marina D.; MACHADO, Antonio E. H.; ARAÚJO, Diesley M. S.; SOUZA, Jhonathan R.; NASCIMENTO, Otaciro Rangel; SANTANA, Vinícius T.; CAVALHEIRO, Carla Cristina Schmitt; CARVALHO JUNIOR, Valdemiro P.; GOI, Beatriz E.
RIGA, Beatriz A.; NEVES, Marina D.; MACHADO, Antonio E. H.; ARAÚJO, Diesley M. S.; SOUZA, Jhonathan R.; NASCIMENTO, Otaciro Rangel; SANTANA, Vinícius T.; CAVALHEIRO, Carla Cristina Schmitt; CARVALHO JUNIOR, Valdemiro P.; GOI, Beatriz E.
 Abstract: This study describes the synthesis and characterization of three a-diimine-cobalt complexes of the type [CoCl2(R-DAB)] (R-DAB = RAN@CHACH@NAR; R = Mes, Dipp and Dipp/) and their application as mediators for the cobalt-mediated radical polymerization (CMRP) of vinyl acetate (VAc) using 2,20-Azobis(2- methylpropionitrile) (AIBN) as initiator. The complexes were characterised by elemental analyses, FTIR, UV-Vis, electron paramagnetic resonance spectroscopy, cyclic voltammetry, and computational methods. The systematic variation of the reaction conditions, such as [initiator]/[Co] and [monomer]/[Co] molar ratios at 65 °C, affected the polymerization rates and the molecular weights, reaching a certain level of control. The VAc polymerization was initiated by AIBN in the presence of DMSO using the a-diiminecobalt complexes as mediators with [DMSO]/[Co] = 1 at 65 °C. The control over the polymer produced was not improved after the addition of DMSO. Kinetics studies and computational investigations support a tailorable cobalt complex reactivity mainly altered by steric factors of the a-diimine ligands. | |
| Inorganica Chimica Acta |
| v. 471, p. 620-629 - Ano: 2018 |
| Fator de Impacto: 2,002 |
| http://dx.doi.org/10.1016/j.ica.2017.11.041 |  @article={002863755,author = {RIGA, Beatriz A.; NEVES, Marina D.; MACHADO, Antonio E. H.; ARAÚJO, Diesley M. S.; SOUZA, Jhonathan R.; NASCIMENTO, Otaciro Rangel; SANTANA, Vinícius T.; CAVALHEIRO, Carla Cristina Schmitt; CARVALHO JUNIOR, Valdemiro P.; GOI, Beatriz E.},title={Synthesis of cobalt(II)-a-diimines complexes and their activity as mediators in organometallic mediated radical polymerization of vinyl acetate},journal={Inorganica Chimica Acta},note={v. 471, p. 620-629},year={2018}} |
