Multiple-angle-of-incidence polarization infrared reflection-absorption spectroscopy (MAI-PIRRAS) for investigation of 6-Mercaptopurine SAMs on smooth silver surface

被引：4
作者：
Bu, Yali [1 ]
Huan, Shuangyan [1 ]
Liu, Xiangjiang [1 ]
Shen, Guoli [1 ]
Yu, Ruqin [1 ]
机构：
[1] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China
来源：
VIBRATIONAL SPECTROSCOPY | 2009年 / 49卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Multiple-angle-of-incidence; Polarization infrared reflection-adsorption spectroscopy; 6-Mercaptopurine; Self-assembled monolayers; SELF-ASSEMBLED MONOLAYERS; TIME SAMPLING ELECTRONICS; IN-SITU SERS; FOURIER-TRANSFORM; GOLD SURFACES; THIN-FILMS; ORIENTATION; ACID; KINETICS;
D O I：
10.1016/j.vibspec.2008.04.011
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Multiple-angle-of-incidence polarization infrared reflection-absorption spectroscopy (MAI-PIRRAS) has been used to study the adsorption mode and structural properties of 6-Mercaptopurine (6MP) self-assembled monolayers (SAMs) on smooth silver surface. The in-plane vibrations of the 6MP SAMs show some enhancement compared with the spectrum of the solid powder of 6MP, while the out-of-plane vibrations are very weak. Assignments of the observed bands by DFT calculations show that both the thiol form and the tautomer of 6MP exist in the SAMs and adopt the S atom and the N7 or N1 atom anchoring the silver surface. In order to eliminate the influence of the angle of the incidence and obtain direct influence of the orientation of the 6MP to the spectral intensity, the adsorption intensity of the SAMs is multiplied by cos theta to obtain corrected spectra. The adsorption intensity attains to the maximum at 35-40 degrees other than near the grazing angle. The characteristics of the spectra suggest that the SAMs of 6MP are arranged orderly in a parallel fashion with a dihedral angle of 35-40 degrees between the ring plane and the silver surface. (C) 2008 Elsevier B.V. All rights reserved.
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页码：38 / 42
页数：5
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