INVESTIGADORES
SCHMIDT Luciana Carina
congresos y reuniones científicas
Título:
Visible Light Photoredox Catalysis Using Water-Soluble Quantum Dots: Aerobic Hidroxylation Of Arylboronic Acids
Autor/es:
CASTRO GODOY, WILBER D.; SCHMIDT, LUCIANA C; FLORES-OÑAS DIEGO R.; JULIA PÉREZ PRIETO; ALICIA B. PEÑÉÑORY; RAQUEL E. GALIAN; JUAN E. ARGÜELLO
Lugar:
Cordoba
Reunión:
Congreso; Tercera Reunión NanoCórdoba 2014; 2014
Resumen:
Quantum Dots (QDs) are semiconductor nanoparticles with unique size-dependent optical and electronic properties.
The QDs have interest in the photocatalytic production of superoxide anion by electron transfer from the
conduction band to molecular oxygen under visible light irradiation.
Herein, we report the preparation of water-dispersible CdS QDs capped with mercaptopropionic and mercaptosuccinic
acids as ligands. The QDs were synthesized following a previously described methodology with some
modifications.[1],[2] The use of these organic ligands prevents the QD aggregation, provides their aqueous dispersibility
and allow their support on TiO2 nanoparticles (CdS/TiO2. Moreover, the photocatalytic performance of
CdS and CdS/TiO2 where tested in the aerobic oxidative hydroxylation of arylboronic acids under visible lamps
irradiation. In this reaction, the superoxide radical anion generated from the exciton of the QDs react with arylboronic
acids because of its Lewis acidity, followed by a series of rearrangements to provide aryl alcohols. [3]
This represents the first example of the use of QDs nanoparticle driven chemical transformation under environmental
friendly conditions.
[1] Kaur, G.; Tripathi, S. Mater. Chem. Phys. 2014, 2, 514-523.
[2] Kumar, P.; Kukkar, D.; Deep, A.; Sharma, S.; Bharadwaj, L. Adv. Mat. Lett. 2012, 3 (6), 471-475.
[3] Zou, Y-Q.; Chen, J-R.; Lui, X-P.; Lu, L-Q.; Davis, R. L.; Jorgensen, K. A.; Xiao, W-J. Angew. Chem. Int. Ed.
2012, 51, 787-788.