Fourier transform infrared (FT-IR) and FT-Raman spectra of 4-ethyl-N-(2′-hydroxy-5′-nitrophenyl)benzamide were recorded and analyzed. A surface-enhanced Raman scattering (SERS) spectrum was recorded in silver colloid. The vibrational wavenumbers and corresponding vibrational assignments were examined theoretically using the Gaussian03 set of quantum chemistry codes. The red shift of the NH stretching wavenumber in the infrared spectrum from the computational wavenumber indicates the weakening of the NH bond resulting in proton transfer to the neighboring oxygen atom. The simultaneous IR and Raman activation of the CO stretching mode gives the charge transfer interaction through a π-conjugated path. The presence of methyl modes in the SERS spectrum indicates the nearness of the methyl group to the metal surface, which affects the orientation and metal molecule interaction. The first hyperpolarizability and predicted infrared intensities are reported. The calculated first hyperpolarizability is comparable with the reported values of similar derivatives and is an attractive subject for future studies of nonlinear optics. Optimized geometrical parameters of the title compound are in agreement with reported structures. Copyright © 2009 John Wiley & Sons, Ltd.
记录并分析了 4-乙基-N-(2′-羟基-5′-
硝基苯基)苯甲酰胺的傅立叶变换红外光谱(FT-IR)和傅立叶变换拉曼光谱。在
银胶体中记录了表面增强拉曼散射(
SERS)光谱。使用 Gaussian03 量子
化学代码集对振动波文数和相应的振动赋值进行了理论研究。红外光谱中的 NH 拉伸波文数与计算波文数相比发生了红移,这表明 NH 键的减弱导致质子转移到了邻近的氧原子上。红外光谱和拉曼光谱同时激活了 CO 拉伸模式,表明电荷转移相互作用是通过 π 共轭路径进行的。
SERS 光谱中出现的甲基模式表明甲基靠近
金属表面,从而影响了取向和
金属分子的相互作用。报告了第一超极化率和预测的红外强度。计算出的第一超极化率与报告中类似衍
生物的值相当,是未来非线性光学研究的一个有吸引力的课题。标题化合物的优化几何参数与报道的结构一致。Copyright © 2009 John Wiley & Sons, Ltd. All Rights Re
SErved.