Autor(es)

Cruz, Thais R. ; Masson, Gustavo H. C. ; Amorim, Kelly A. E. ; Machado, Antonio E. H. ; Goi, Beatriz E. ; Carvalho-Jr, Valdemiro P.

• Tipo de documento: Artigo Científico
• Fonte: CATALYSTS; v. 12, n. 10, p. 16-pg., 2022-10-01.

Resumo

The [Ru(PPh3)(2)Cl-piperidine(4-aminomethyl)] complex (mono-Ru) was synthesized from [Ru(PPh3)(3)Cl-2] and 4-(aminomethyl)piperidine, whereas the [(PPh3)PdCl(Shiff-pip)] complex (mono-Pd) was obtained by reacting [Pd(PPh3)(2)Cl-2] with its respective Schiff base ligand, both at a 1:1 molar ratio. The heterobimetallic [RuCl2(PPh3)(2)](mu-Schiff)Pd(PPh3)Cl] complex (Ru/Pd) was synthesized via a one-pot, three-component reaction of mono-Ru, [(Pd(PPh3)(2)Cl-2] and salicylaldehyde. All complexes were fully characterized by FTIR, UV-Vis, and NMR spectroscopy, as well as elemental analysis, MALDI-TOF mass spectrometry, cyclic voltammetry, and computational studies. Ru/Pd was able to polymerize norbornene (NBE) by two different mechanisms: ROMP and vinyl polymerization. The Ru fragment was active for ROMP of NBE, reaching yields of 68 and 31% for mono-Ru and Ru/Pd, respectively, when the [NBE]/[Ru] = 3000 molar ratio and 5 mu L EDA addition were employed at 50 degrees C. The poly(norbornene) (polyNBE) obtained presented an order of magnitude of 10(4) g mol(-1) and <SIC> values between 1.48 and 1.79. For the vinyl polymerization of NBE, the Pd fragment was active using MAO as a cocatalyst, reaching a yield of 47.0% for Ru/Pd and quantitative yields for mono-Pd when [Al]/[Pd] = 2500 and [NBE]/[Pd] = 20,000 molar ratios were employed, both at 60 degrees C. (AU)

• Processo FAPESP: 21/13128-1 - Desenvolvimento de novos materiais poliméricos via acoplamento de reações mecanisticamente incompatíveis usando catalisadores heterobimetálicos de Ru/Pd e Ru/Ni
• Beneficiário: Valdemiro Pereira de Carvalho Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/06340-1 - Complexos bimetálicos de rutênio(II) e níquel(II): acoplamento de reações mecanisticamente incompatíveis usando catalisadores multifuncionais via catálise tandem
• Beneficiário: Valdemiro Pereira de Carvalho Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/11873-1 - Complexos organometálicos de Mn(II), Fe(II) e Ni(II) como fotocatalisadores redox da CRP2: nova estratégia para fotopolimerização com LEDs
• Beneficiário: Beatriz Eleutério Goi Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Regular