Effect of the Metal-Ligand Interface on the Chiroptical Activity of Cysteine-Protected Nanoparticles
Por:
Rodriguez-Zamora, Penelope, Cordero-Silis, Cedric A., Garza-Ramos, Georgina R., Salazar-Angeles, Benjamin, Luque-Ceballos, Jonathan C., Fabila, Jorge C., Buendia, Fernando, Paz-Borbon, Lauro Oliver, Diaz, Gabriela, Garzon, Ignacio L.
Publicada:
1 jul 2021
Ahead of Print:
1 ene 2021
Resumen:
Gold, silver, and copper small nanoparticles (NPs), with average size
approximate to 2 nm, are synthesized and afterward protected with l- and
d-cysteine, demonstrating emergence of chiroptical activity in the
wavelength range of 250-400 nm for all three metals with respect to the
bare nanoparticles and ligands alone. Silver-cysteine (Ag-Cys) NPs
display the higher anisotropy factor, whereas gold-cysteine (Au-Cys) NPs
show optical and chiroptical signatures slightly more displaced to the
visible range. A larger number of circular dichroism (CD) bands with
smaller intensity, as compared to gold and silver, is observed for the
first time for copper-cysteine (Cu-Cys) NPs. The manifestation of
optical and chiroptical responses upon cysteine adsorption and the
differences between the spectra corresponding to each metal are mainly
dictated by the metal-ligand interface, as supported by a comparison
with calculations of the oscillatory and rotatory strengths based on
time-dependent density functional theory, using a metal-ligand interface
motif model, which closely resembles the experimental absorption and CD
spectra. These results are useful to demonstrate the relevance of the
interface between chiral ligands and the metal surfaces of Au, Ag, and
Cu NPs, and provide evidence and further insights into the origin of the
transfer mechanisms and induction of extrinsic chirality.
Filiaciones:
Rodriguez-Zamora, Penelope:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Cordero-Silis, Cedric A.:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Garza-Ramos, Georgina R.:
G. R. Garza-Ramos, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Fac Med, Mexico City 04510, DF, Mexico
Salazar-Angeles, Benjamin:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Luque-Ceballos, Jonathan C.:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Fabila, Jorge C.:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Buendia, Fernando:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Paz-Borbon, Lauro Oliver:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Diaz, Gabriela:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
Garzon, Ignacio L.:
P. Rodríguez-Zamora, C. A. Cordero-Silis, B. Salazar-Angeles, J. C. Luque-Ceballos, J. C. Fabila, F. Buendía, L. O. Paz- Borbón, G. Díaz, I. L. Garzón, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico
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