New Co(III) organometallic complexes coordinated with non-symmetric Schiff bases to mediate photo-OMRP

Author(s)

Larissa Fazioni de Oliveira

• Document type: Master's Dissertation
• Press: São José do Rio Preto. 2021-02-12.
• Institution: Universidade Estadual Paulista (Unesp). Instituto de Biociências Letras e Ciências Exatas. São José do Rio Preto
• Defense date: 2021-02-11
• Advisor: Beatriz Eleutério Goi; Valdemiro Pereira de Carvalho Júnior

Abstract

In recent years there has been a growing increase in the development of new techniques of controlled radical polymerization (CRP). In view of this, this work provides a synthetic of a new non-symmetrical cobalt (II) complex, [CoII(Salen-tert-butyl)]. The precursor, the ligand and the complex were characterized by absorption spectroscopy in the UV-Vis region, vibrational spectroscopy in the infrared region (FTIR), cyclic voltammetry and Nuclear Magnetic Resonance (1H and 13C NMR). The [CoII(Salen-tert-butyl)] complex was used as a mediator in the photo-OMRP (Radical Polymerization Mediated by Organometallic Complexes) of vinyl acetate (VAc) and butyl acrylate (BA) in different molar types [BA ] / [CoII] / [TPO]. With the kinetic study it was noted that all systems based on a pseudo-first order kinetic profile. Systems with smaller TPO offer less control, with polydispersity indexes (Ð) below 1.5. The photo-OMRP mediated by the symmetric complex [CoII(Salen-di-tertbutyl)] shows greater control in polymerization. (AU)

• FAPESP's process: 19/03354-4 - New organometallic complexes Co (III) coordinated to asymmetric schiff bases to mediate photo-OMRP
• Grantee: Larissa Fazioni de Oliveira
• Support Opportunities: Scholarships in Brazil - Master