Ruthenium complexes bearing N-heterocyclic carbene and dimethylsulphoxide as dual catalyts in simultaneous polymerization ROMP/ATRP

• Grant number: 15/01165-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2015
• End date: April 30, 2017
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Valdemiro Pereira de Carvalho Júnior
• Grantee: Rodolpho Alessandro Nesta Silva
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
• Associated research grant: 13/10002-0 - Development of ruthenium complexes as dual catalytic systems in simultaneous polymerization ROMP/ATRP, AP.JP

Abstract

New ruthenium complexes will be synthesized to promote the ring opening metathesis polymerization (ROMP) and atom transfer radical polymerization (ATRP) simultaneously. The proposal is to systematically evaluate different combinations of ancillary ligands in the coordination sphere of ruthenium complexes and then, reach a fine tuning through the variation of the electronic and steric contributions, which have the task of driving the reactivity of these complexes to operate efficiently in the tandem catalysis ROMP/ATRP. The investigated ligands will be different N-heterocyclic carbenes and dimethylsulfoxides simultaneously coordinated to the ruthenium center to polymerize cyclic olefin monomers via ROMP and vinyl monomer via ATRP in order to obtain block copolymers composed of mechanically incompatible monomers. Initially, the research will focus on the catalytic activity of the complexes in ROMP and ATRP reactions separately, considering that a wide understanding of individual reactions will be a key step towards to the development of dual catalysts for tandem catalysis ROMP/ATRP. The intension is to provide base for understanding the performance of the catalysts, as well as the formation of reaction intermediates involved in each catalyse, and then, design dual catalytic systems that combine reactivity and selectivity for synthesis of new materials with different architecture by tandem polymerization ROMP/ATRP.