NaNbO3/Eumelanin composite: A new photocatalyst under visible light

Fernandes, Daiane; Raubach, Cristiane W.; Ferrer, Mateus M.; Jardim, Pedro Lovato Gomes; Graeff, Carlos Frederico de Oliveira; Moreira, Mário L.; Moreira, Eduardo Ceretta; Mastelaro, Valmor Roberto; Cava, Sergio da S.

doi:10.1016/j.ceramint.2022.12.094

Cited by 7 publications

(2 citation statements)

References 55 publications

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“…Accordingly, we repeated our model reaction for the dehalogenation of 1‐Br in the presence of selected additives. In particular, we added disodium ethylenediaminetetraacetate (Na 2 EDTA) and silver nitrate, respectively, which are known for their activity as electron and hole scavengers, respectively [12a] . Scheme 2 shows that the two additives have markedly different effects on the reaction outcome.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, while the reaction under optimized conditions delivers 90 % 1‐H with no starting material left, a limited yield drop occurs in the presence of Na 2 EDTA (70 % yield of 1‐H with 20 % remaining 1‐Br ). On the other hand, product formation is dramatically hampered by the presence of silver nitrate (10 % yield of 1‐H , with 80 % unreacted 1‐Br ), clearly indicating the role of electrons as charge carriers in the observed reactivity [12a] …”

Section: Resultsmentioning

confidence: 99%

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Exploring the Reactivity of Melanins as Photocatalysts for Reductive Dehalogenations

Capucciati,

Foli,

Lioniello

et al. 2024

Eur J Org Chem

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Four melanin polymers prepared from different precursors (5,6‐dihydroxyindole, 5,6‐dihydroxyindole 2‐carboxylic acid, 1,8‐dihydroxynaphthalene and dopamine) have been adopted as photocatalysts in the reductive dehalogenation of a series of model a‐halogen carbonyl derivatives. The best performing melanin was that obtained from 5,6‐dihydroxyindole 2‐carboxylic acid, which allowed to dehalogenate efficiently both bromomalonate esters and phenacyl bromide; on the other hand, chloromalonate esters were almost unreactive under the same reaction conditions. Electrochemical and control experiments enabled to elucidate the reaction mechanism, demonstrating the key role of electrons as charge carriers in the observed photocatalytic process.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%