Open AccessSum frequency generation spectroscopy probing of formation of self-assembled monolayers from thiols with terminal phenylalanine ring and intrachain amide groups
Author(s) -
Marija Špandyreva,
Ilja Ignatjev,
Ieva Matulaitienė,
Zeas Kuodis,
Gediminas Niaura
Publication year - 2018
Publication title -
chemija
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.16
H-Index - 15
eISSN - 2424-4538
pISSN - 0235-7216
DOI - 10.6001/chemija.v29i4.3837
Subject(s) - sum frequency generation spectroscopy , chemistry , amide , spectroscopy , monolayer , ring (chemistry) , hydrogen bond , sum frequency generation , phenylalanine , molecule , infrared spectroscopy , molecular vibration , crystallography , self assembled monolayer , stereochemistry , organic chemistry , amino acid , nonlinear optics , optics , laser , biochemistry , physics , quantum mechanics
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.