120th General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Exhibition Hall 2+3
Time 10월 20일 (금요일) 13:00~14:30
Code PHYS.P-92
Subject Structure and adsorption behavior depending on various pH conditions of 4’,4’’’-(diazene-1,2-diyl)bis(([1,1’-biphenyl]-4-carbonitrile)) on silver surfaces
Authors So Young Eom, Hong Lae Kim*, Chan Ho Kwon*
Department of Chemistry, Kangwon National University, Korea
Abstract Adsorption behavior of 4',4'''-(diazene-1,2-diyl)bis(([1,1'-biphenyl]-4-carbonitrile)) (DDBBC) on silver surfaces was investigated depending on pH conditions to understand the surface-induced photoconversion between the amino group and the azo compound. The surface-enhanced Raman scattering (SERS) spectra of DDBBC on Ag surfaces were measured in various pH conditions as well as the ordinary Raman spectra of neat sample in solid state for comparison. Spectral assignments were provided with an aid of density functional theory calculations. In the SERS spectra, the up-shifted and the broadening of the CN stretching vibrational peak indicate that the adsorption takes pace via the CN bond on the metal surface. However, the appearance of the C-H stretching bands and the disappearance of the N=N stretching (azo) bands in the acidic condition suggest that DDBBC should be converted to 4,4’-aminocyanobiphenyl adsorbed on the Ag surface with vertical orientation. In the present work, it is worth noting that the molecular structure and orientation against the Ag surface could be reversibly controlled by pH in solution.
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