Sum Frequency Generation Spectrum of a Self-Assembled Monolayer Containing Two Different Methyl Group Orientations

2012 ◽  
Vol 3 (22) ◽  
pp. 3276-3280 ◽  
Author(s):  
P. J. N. Kett ◽  
M. T. L. Casford ◽  
P. B. Davies
Keyword(s):  
Sum Frequency Generation ◽  
Self Assembled Monolayer ◽  
Methyl Group ◽  
Sum Frequency ◽  
Generation Spectrum ◽  
Self Assembled ◽  
Frequency Generation

Chemisorption of Self Assembled Alkyl Thiol on Au(111)

1994 ◽  
Vol 366 ◽  
Author(s):  
M. S. Yeganeh ◽  
S. M. Dougal ◽  
R. S. Polizzotti ◽  
P. Rabinowitz
Keyword(s):  
Azimuthal Angle ◽  
Sum Frequency Generation ◽  
Interfacial Structure ◽  
Single Type ◽  
Gold Substrate ◽  
Self Assembled Monolayer ◽  
Sum Frequency ◽  
Self Assembled ◽  
Frequency Generation

ABSTRACTWe have used infrared-visible sum-frequency generation (SFG) to spectroscopically probe the interfacial structure of a self assembled monolayer (SAM) of alkyl thiol on a Au(111) surface. The SFG spectra of the CH3 group measured as a function of azimuthal angle indicates that sulfur atoms cannot be situated at sites of a single type, e.g., hollow or bridge, but must be in a mixed arrangement. SFG is also used to study the reconstruction of the gold substrate by alkyl thiol.

scholarly journals Sum frequency generation spectroscopy probing of formation of self-assembled monolayers from thiols with terminal phenylalanine ring and intrachain amide groups

Chemija ◽  
2018 ◽  
Vol 29 (4) ◽  
Author(s):  
Marija Špandyreva ◽  
Ilja Ignatjev ◽  
Ieva Matulaitienė ◽  
Zenonas Kuodis ◽  
Gediminas Niaura
Keyword(s):  
Low Frequency ◽  
Sum Frequency Generation ◽  
Self Assembled Monolayer ◽  
Sum Frequency ◽  
Sum Frequency Generation Spectroscopy ◽  
Assembled Monolayers ◽  
Stretching Vibration ◽  
Polycrystalline Gold ◽  
Self Assembled ◽  
Frequency Generation

Formation of a self-assembled monolayer onto the polycrystalline gold substrate from thiols containing a terminal phenylalanine (Phe) ring and intrachain amide groups (HS-(CH2)7-CONH-(CH2)2-C6H5) was characterized by vibrational sum frequency generation (SFG) spectroscopy. The temporal evolution of the characteristic Phe ring stretching vibration ν(=C–H) near 3069 cm–1 and the Amide A mode were monitored by nonlinear vibrational spectroscopy. The SFG data revealed the complete ordering of the terminal Phe rings after about 60 min of adsorption. Formation of a strong hydrogen bonding between the adjacent chains of adsorbed molecules was evident by appearance of the Amide A mode at the relative low frequency (3280–3308 cm–1). The well-ordered and strongly hydrogen bonded SAM with the terminal Phe ring functionality is a promising platform for the analysis of interactions and the function of aromatic rings in biomolecular processes.

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