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Self‐assembled monolayers of inositol hexaphosphate on the roughened surface of an iron electrode: investigation by surface‐enhanced Raman scattering spectroscopy
Author(s) -
Yang Haifeng,
Feng Jie,
Liu Yanli,
Yang Yunhui,
Wu Jing,
Zhang Zongrang,
Shen Guoli,
Yu Ruqin
Publication year - 2005
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1369
Subject(s) - monolayer , chemistry , raman scattering , raman spectroscopy , adsorption , molecule , electrochemistry , self assembled monolayer , inorganic chemistry , electrode , analytical chemistry (journal) , organic chemistry , biochemistry , physics , optics
Inositol hexaphosphate (IP 6 ) molecules as an environmentally friendly inhibitor were self‐assembled at a bare iron surface forming monolayers from a low concentration solution. Roughening of the iron surface by a special oxidation–reduction cycle makes it possible to obtain surface‐enhanced Raman scattering (SERS) mapping spectra of the self‐assembled monolayers (SAMs) of IP 6 . Using the recorded SERS spectra and quantum chemistry calculations for the vibrational modes of the IP 6 molecule with the PM3 method, the adsorption configurations of IP 6 SAMs formed at the roughened iron surface in bulk solutions under various pH conditions were deduced. At pH 5, the IP 6 molecules are assumed to be located at the surface via four coplanar phosphates to form SAMs, whereas at pH 11.27, value of the IP 6 solution it is assumed that only one phosphate is adsorbed on the iron surface. The results of electrochemical polarization measurements indicated that the inhibition efficiency of IP 6 SAMs formed at pH 5 was higher than at pH 11.27, which was related to their different interactions with the iron surface. Copyright © 2005 John Wiley & Sons, Ltd.