Advanced NHC-Based First-Row Metal Photocatalysts for Photopolymerization and 3D Printing
Palavras-chave:
iron, manganese, nickel, NHC, photopolymerization, 3D printingResumo
First-row transition metal complexes have gained attention as alternatives to noble metals in various reactions, particularly as
efficient redox-active photocatalysts in photopolymerization reactions. In this study, FeII, MnII, and NiII complexes bearing Nheterocyclic carbene (NHC) ligands were evaluated as photocatalysts in free-radical photopolymerization (FRP). A threecomponent system composed of the photocatalyst (PC), di-tert-butyl-diphenyliodonium hexafluorophosphate (Iod), and ethyl
dimethylaminobenzoate (EDB) was employed for FRP of ethoxylated trimethylolpropane triacrylate (TMPETA) under violet
LED irradiation. The NHC-metal complexes exhibited promising photocatalytic performance under LED@405 nm. Moreover,
the emissive nature of these complexes allowed for a comparative analysis of the influence of both the NHC ligand and the metal
center, establishing a relationship between their optical properties and catalytic activity. The optimal condition was successfully
applied in 3D printing, yielding well-defined 3D patterns.
Referências
1 M. L. B. Figueiredo, C. Bignardi, N. M. Pesqueira, A. E. H. Machado, V. P. Carvalho-Jr, O. R. Nascimento, and B. E. Goi, J. Photochem. Photobiol. A Chem., 2024, 452, 115567.
2 N. M. Pesqueira, F. Morlet-Savary, M. Schmitt, V. P. Carvalho-Jr, B. E. Goi and J. Lalevée, Polym. Chem., 2025, 16, 2436-2448.
3 C. Bignardi, N. M. Pesqueira, Y. M. Shimizo, A. E. H. Machado, D. M. S. Araújo, O. R. Nascimento, V. P. Carvalho-Jr, J. Lalevée, and B. E. Goi, ACS Appl. Polym. Mater., 2025, 7, 7429– 7439.
