FO5-13/PII.061 Synthesis of a new RuII/NiII heterobimetallic complex as a bifunctional catalyst for mechanistically distinct polymerization reactions - Romp and addition polymerization.

Resumo

With the need for new polymeric materials that could satisfy the advances in technology, the search for polymers with sophisticated properties and architectures has become increasingly attractive. Heterobimetallic catalysts have been gaining great ascension in recent years due to their multifunctionality in catalysis, as well as the mechanistic synergism that such systems can provide1. In this work, a ruthenium(II) and nickel(II) heterobimetallic catalyst [RuCl2(n⁶-p-cymene)][(u-Schiff-pip)Ni(Aryl-NBE)(PPh₃)] (Ru- Ni) and its catalytic activity was evaluated in ROMP and addition polymerization reactions using norbornene (NBE) as monomer. Ru-Ni was shown to be active for metathesis ring opening polymerizations (ROMP), reaching a yield of 40% at 50 °C, using a molar ratio [NBE]/[Ru] = 5000, 3 mL of EDA and a reaction time of 60 minutes. The heterobimetallic complex was also active against NBE polymerization reactions via addition, using methylaluminoxane (MAO) as cocatalyst, obtaining a yield of 92% using the molar ratio [Al]/[Ni] = 2500 at 30°C, with a TOF (turnover frequency) of 6.96.