New organometallic complexes Co (III) coordinated to asymmetric schiff bases to mediate photo-OMRP

• Grant number: 19/03354-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: August 01, 2019
• End date: February 28, 2021
• Field of knowledge: Physical Sciences and Mathematics - Chemistry
• Principal Investigator: Beatriz Eleutério Goi Carvalho
• Grantee: Larissa Fazioni de Oliveira
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil

Abstract

Organometallic complexes CoIII will be synthesized to mediate/control organometallic-mediated radical photopolymerization reactions - Photo-OMRP (Organometallic-Mediated Radical Polymerization). The proposal is to systematically evaluate different combinations of coordinate ancillary ligands to different transition metals and, consequently, to achieve a fine adjustment through the variation of the electronic and steric contributions in the metallic center, directing the reactivity of these organometallic complexes to act efficiently in the photo-OMRP. The ligands evaluated will be different unpublished asymmetric Schiff bases coordinated to the metal center of Co versus the polymerization of vinyl monomers via photo-OMRP. The proposal extends in three stages, which are completely interconnected in the development process. Initially, the attention will be focused on the synthesis of tetradentate asymmetric Schiff bases. The second step will be focused on the synthesis of the Co (II) complexes coordinated with the different Schiff base ligands. The third step will be dedicated to the evaluation of the efficiency Co (II) complexes in the photo-OMRP reaction. The final step will be to select the Co (II) complexes with the best performances and submit them to an addition reaction with the radical generated by the photochemical cleavage of a symmetric primer for obtain the organometallic complexes (III). It is intended, therefore, to establish fundamentals for the understanding of the performance of the mediators, as well as the formation of the reaction intermediates involved in each reaction, allowing the planning of systems that combine reactivity and selectivity for the synthesis of new materials with differentiated architecture via photo-OMRP. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

OLIVEIRA, LARISSA F.; BIGNARDI, CAMILA; PESQUEIRA, NARALYNE M.; RIGA-ROCHA, BEATRIZ A.; MACHADO, ANTONIO E. H.; CARVALHO-JR, VALDEMIRO P.; GOI, BEATRIZ E.. Photocontrolled reversible-deactivation radical polymerization of butyl acrylate mediated by Salen-type Co-II complexes. EUROPEAN POLYMER JOURNAL, v. 159, OCT 5 2021. (18/06340-1, 19/03354-4, 18/19395-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

OLIVEIRA, Larissa Fazioni de. New Co(III) organometallic complexes coordinated with non-symmetric Schiff bases to mediate photo-OMRP. 2021. Master's Dissertation - Universidade Estadual Paulista (Unesp). Instituto de Biociências Letras e Ciências Exatas. São José do Rio Preto São José do Rio Preto.