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Very low energy vibrational modes as a fingerprint of H-bond network formation: L-cysteine on Au(111) (Articolo in rivista)

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Very low energy vibrational modes as a fingerprint of H-bond network formation: L-cysteine on Au(111) (Articolo in rivista) (literal)

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De Renzi, V; Lavagnino, L; Corradini, V; Biagi, R; Canepa, M; del Pennino, U (2008)
Very low energy vibrational modes as a fingerprint of H-bond network formation: L-cysteine on Au(111)
in Journal of physical chemistry. C
(literal)

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De Renzi, V; Lavagnino, L; Corradini, V; Biagi, R; Canepa, M; del Pennino, U (literal)

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\"[De Renzi, V.; Biagi, R.; del Pennino, U.] Univ Modena & Reggio Emilia, Dipartimento Fis, Modena, Italy; [De Renzi, V.; Corradini, V.; Biagi, R.; del Pennino, U.] INFM, CNR, Ctr Nanostruct & Biosyst Surface, Modena, Italy; [Lavagnino, L.; Canepa, M.] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy; [Lavagnino, L.; Canepa, M.] Univ Genoa, CNISM, I-16146 Genoa, Italy (literal)

Titolo

Very low energy vibrational modes as a fingerprint of H-bond network formation: L-cysteine on Au(111) (literal)

Abstract

The ultrahigh vacuum adsorption of cysteine layers on the Au(111) surface has been studied by means of X-ray photoelectron (XPS) and high-resolution energy loss spectroscopies (HREELS). Room-temperature deposition determined the formation of a quite heterogeneous first layer, where both weakly and strongly bound molecules coexist. Deposition at a slightly higher temperature (330 K) led instead to the formation of a homogeneous, self-assembled monolayer made of molecules chemisorbed through a thiolate bond. In the latter case, HREELS measurements have been interpreted in terms of a well-organized H-bond network made of zwitterionic molecules. Two vibrational modes, denoted as N and H modes, respectively, have been identified as distinguishing features of the homogeneous monolayer obtained at 330 K. The N mode lies at 3350 cm(-1) and is attributed to a stretching vibration of the N-H center dot center dot center dot O bond. The H mode, observed at 74 cm(-1) for full monolayer coverage, is assigned to a collective vibration of the two-dimensional H-bond network. At half-monolayer coverage, the H mode has been observed at 55 cm(-1). This red-shift indicates a coverage dependence of the H-mode frequency, which clearly supports its intermolecular origin. This finding is a nice example of the extreme sensitivity of low-frequency vibrational modes to the details of molecule-molecule interactions. (literal)

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