Heat of Adsorption of Propyne on Cu(111) from Isotherms Measured by Reflection Absorption Infrared Spectroscopy

2021 ◽  
Vol 125 (34) ◽  
pp. 18786-18791
Author(s):  
Arephin Islam ◽  
Mohammed K. Abdel-Rahman ◽  
Michael Trenary
Keyword(s):  
Infrared Spectroscopy ◽  
Heat Of Adsorption ◽  
Reflection Absorption Infrared Spectroscopy

scholarly journals Reflection Absorption Infrared Spectroscopy Characterization of SAM Formation from 8-Mercapto-N-(phenethyl)octanamide Thiols with Phe Ring and Amide Groups

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5633
Author(s):  
Zenonas Kuodis ◽  
Ieva Matulaitienė ◽  
Marija Špandyreva ◽  
Linas Labanauskas ◽  
Sigitas Stončius ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Self Assembled Monolayers ◽  
Trans Conformation ◽  
Band Frequency ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Assembled Monolayers ◽  
Vibrational Bands ◽  
Induced Changes ◽  
Hydrogen Bonded

Multifunctional amide-containing self-assembled monolayers (SAMs) provide prospects for the construction of interfaces with required physicochemical properties and distinctive stability. In this study, we report the synthesis of amide-containing thiols with terminal phenylalanine (Phe) ring functionality (HS(CH2)7CONH(CH2)2C6H5) and the characterization of the formation of SAMs from these thiols on gold by reflection absorption infrared spectroscopy (RAIRS). For reliable assignments of vibrational bands, ring deuterated analogs were synthesized and studied as well. Adsorption time induced changes in Amide-II band frequency and relative intensity of Amide-II/Amide-I bands revealed two-state sigmoidal form dependence with a transition inflection points at 2.2 ± 0.5 and 4.7 ± 0.5 min, respectively. The transition from initial (disordered) to final (hydrogen-bonded, ordered) structure resulted in increased Amide-II frequency from 1548 to 1557 cm−1, which is diagnostic for a strongly hydrogen-bonded amide network in trans conformation. However, the lateral interactions between the alkyl chains were found to be somewhat reduced when compared with well-ordered alkane thiol monolayers.

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