Well-defined non-symmetric NHC-iron(III) catalyst for photoinduced atom-transfer radical polymerization of methyl methacrylate

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade Federal de Uberlândia (UFU)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorFigueiredo, Maria L.B.-
Autor(es): dc.creatorBignardi, Camila-
Autor(es): dc.creatorPesqueira, Naralyne M.-
Autor(es): dc.creatorMachado, Antonio E.H.-
Autor(es): dc.creatorCarvalho-Jr, Valdemiro P.-
Autor(es): dc.creatorNascimento, Otaciro R.-
Autor(es): dc.creatorGoi, Beatriz E.-
Data de aceite: dc.date.accessioned2025-08-21T20:05:13Z-
Data de disponibilização: dc.date.available2025-08-21T20:05:13Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-07-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jphotochem.2024.115567-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/300359-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/300359-
Descrição: dc.descriptionPhotoinduced atom transfer radical polymerization (photo-ATRP) has emerged as a prominent technique in contemporary polymer chemistry, offering a potent means to create precisely structured materials. Well-defined catalysts are essential for controlling the growth of polymers with reproducible results; however, most photo-ATRP catalytic systems involve mixing the metal salt with the ligand. Herein we present a well-defined iron(III) based photo-ATRP catalyst bearing bidentate NHC ligand, 3-Methyl-1-phenyl-1H-3,1-benzimidazol-3-ium iodide (Pmb). The [FeBr(Pmb)2] was successfully synthesized and fully characterized by FTIR, UV–Vis, and EPR spectroscopic studies, elemental analysis, MALDI-TOF mass spectrometry, and computational studies. [FeBr(Pmb)2] was employed as the catalyst for photo-ATRP of methyl methacrylate (MMA) under ultraviolet light irradiation (365 nm). The catalytic activity of [FeBr(Pmb)2] in the photo-ATRP of MMA was evaluated under different conditions using EBPA as the initiator. The polymerizations showed robust activity, yelding in polymers with controlled molecular weights and a narrow molecular weight distribution (MWD). Remarkably, this was achieved with low catalysts loading (102.6 ppm), mainly at the molar ratio [MMA]/[EBPA]/[Fe] = 200/1/0.04. Well-defined polyMMA was synthesized and temporal control over photo-ATRP was successfully demonstrated through “on/off” experiments. For example, photo-ATRP of MMA with a molar ratio of [200/1/0.04] after 12 h at T = 25 °C in bulk resulted in PMMA with a polydispersity (Ð) of 1.15 at 50 % monomer conversion.-
Descrição: dc.descriptionFaculdade de Ciências e Tecnologia UNESP – Univ. Estadual Paulista, SP-
Descrição: dc.descriptionInstituto de Química Universidade Federal de Uberlândia, P.O. Box 593, Minas Gerais-
Descrição: dc.descriptionInstituto de Física de São Carlos USP Universidade de São Paulo, SP-
Descrição: dc.descriptionFaculdade de Ciências e Tecnologia UNESP – Univ. Estadual Paulista, SP-
Idioma: dc.languageen-
Relação: dc.relationJournal of Photochemistry and Photobiology A: Chemistry-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectMethyl methacrylate-
Palavras-chave: dc.subjectN-heterocyclic carbine-
Palavras-chave: dc.subjectTemporal control-
Título: dc.titleWell-defined non-symmetric NHC-iron(III) catalyst for photoinduced atom-transfer radical polymerization of methyl methacrylate-
Tipo de arquivo: dc.typelivro digital-
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