Bibliographic Details
| Title: |
ANGLE-RESOLVED X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF THE THIOUREA DERIVATIVE ADSORPTION ON AU(111) FROM ETHANOLIC SOLUTION. |
| Alternate Title: |
ESTUDIO DE LA ADSORCIÓN SOBRE AU(111) DE UN DERIVADO DE TIOUREA EN DISOLUCIÓN ETANÓLICA MEDIANTE ESPECTROSCOPIA DE ELECTRONES. |
| Authors: |
HERNÁNDEZ, M. P.1 mayrap@imre.uh.cu, NAVARRO-MARÍN, G.1, ESTÉVEZ-HERNÁNDEZ, O.1, FARÍAS-SÁNCHEZ, M. H.2 |
| Source: |
Revista Cubana de Física. dic2017, Vol. 34 Issue 2, p108-111. 4p. |
| Subjects: |
THIOUREA, X-ray photoelectron spectroscopy, ADSORPTION (Chemistry), ETHANOL, GOLD isotopes, FLUORINE, FLUORIDES |
| Abstract (English): |
The adsorption of 1-(2-Furoyl)-3-[3-(trifluoromethyl)phenyl] thiourea on Au(111) from ethanolic solution, was studied by means of angle-resolved X-ray photoelectron spectroscopy (ARXPS). The AR-XPS spectra were obtained at different take-off angles with respect to substrate surface: (50°, 70°, 90° and 110°). The spectra of the C1s at different take-off angles indicated the degradation of the CF3 in CF2 and CF entities. This degradation is due to damages provoked for the effect of the electrons induced by X-ray excitation. High resolution spectra of F1s at these angles, showed two peaks at 687.6 and 688.4 eV, confirming the presence of the organic fluorine (-F-C-) and inorganic fluoride (F-). The X-ray-photoelectron angular measurements were capable of yielding thickness-to-mean free path ratios for the adsorbed layer. Despite of the fluorine lost, such measurements demonstrate the permanence of the CF3 groups in the meta-phenyl position at 10 Å of the inorganic fluoride. A preferential orientation of the species (CFx=1,2,3) at 50° respect to the substrate's surface was observed. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): |
La adsorción de 1-(2-Furoil)-3-[3-(trifluorometil)fenil]tiourea sobre Au(111) en una disolución etanólica, se estudió mediante la distribución angular de fotoelectrones de rayos X (AR-XPS). Los espectros de AR-XPS se obtuvieron a diferentes ángulos de detección con respecto a la superficie del sustrato: 50°, 70°, 90° y 110°. En los espectros angulares de C1s se observa la degradación del grupo CF3 en las especies CF2 y CF. Esta degradación es provocada por el efecto de los electrones inducidos por la excitación de los rayos X. Los espectros de alta resolución de F1s en estos ángulos, mostraron dos picos a 687,6 y 688,4 eV, confirmando la presencia de flúor orgánico (-F-C-) y flúor inorgánico (F-). Las mediciones angulares de fotoelectrones permitieron determinar la relación entre el espesor de la capa de moléculas y el recorrido libre medio de los electrones en la capa adsorbida. A pesar de las pérdidas de flúor, tales mediciones demostraron que los grupos CF3 permanecen en la posición meta del anillo bencénico a una distancia 10 Å del flúor inorgánico. Las especies (CFx=1,2,3) mostraron una orientación preferencial a 50° respecto a la superficie del sustrato [ABSTRACT FROM AUTHOR] |
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| Database: |
MedicLatina |
