Article (Scientific journals)
Synthesis and characterization of aromatic self-assembled monolayers containing methylene and ethyleneglycol entities by means of sum-frequency generation spectroscopy
Dreesen, Laurent; Sartenaer, Y.; Peremans, A. et al.
2006In Thin Solid Films, 500, p. 268-277
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Abstract :
[en] We use infrared-visible sum-frequency generation (SFG) spectroscopy in order to investigate the adsorption properties on Pt(111) of molecules having CH3–C6H4–(O–CH2–CH2)n –O–(CH2)m –SH as general chemical formula. We synthesized three molecules defined by the values m=5 n =4, m =11 n =4, m=11 n =8 and characterized them by Nuclear Magnetic Resonance spectroscopy. Thanks to spectroscopic measurements, we show that these molecules build self-assembled monolayers on Pt(111). First, the weak SFG signals arising from the ad-layer indicate low order and surface coverage of the substrate by these molecules. Next, the vibrational fingerprints of the aforementioned molecules are determined between 2825 and 3125 cm 1 and the observed SFG spectral features are ascribed on the basis of the analysis of shorter and simpler molecules (1- dodecanethiol, 4-methylbenzenethiol and CH3–C6H4–O–(CH2)11–SH) also adsorbed on Pt(111). The occurrence of methylene vibration modes indicates a significant amount of chain defects whatever the n and m numbers are. Finally, the identification of a particular vibration mode, characteristic of the aromatic ring, enables us to qualitatively discuss the effect of the number of methylene and ethylene glycol entities on its orientation. More precisely, higher these numbers, more tilted (with respect to the substrate normal) the aromatic ring plane is.
Disciplines :
Physics
Author, co-author :
Dreesen, Laurent ;  Université de Liège - ULiège > Département de physique > Biophotonique
Sartenaer, Y.
Peremans, A.
Thiry, P. A.
Humbert, C.
Grugier, J.
Marchant-Brynaert, J.
Language :
English
Title :
Synthesis and characterization of aromatic self-assembled monolayers containing methylene and ethyleneglycol entities by means of sum-frequency generation spectroscopy
Publication date :
2006
Journal title :
Thin Solid Films
ISSN :
0040-6090
Publisher :
Elsevier Science
Volume :
500
Pages :
268-277
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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