4-羟基苯甲酰肼的红外光谱研究  

Theoretical Study on Infrared Spectrum of 4-Hydroxybenzhydrazide

作　　者：李会学[1] 王晓峰[1] 潘素娟[1] 唐惠安[1] 刘新文[1] 左国防[1] 武宇涛[1] 

机构地区：[1]甘肃省新型分子材料设计与功能重点实验室天水师范学院生命科学与化学学院,天水741001

出　　处：《分析化学》2013年第9期1378-1384,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.21103021);甘肃省教育厅科研基金(No.1108-03);天水师范学院中青年教师科研基金(No.TSA1116)资助项目

摘　　要：基于密度泛函理论(Density functional theory,DFT)B3LYP/6-311+G(d,p)及二级微扰理论(Second-order Mller-Plesset,MP2)MP2/6-311+G(d,p)对4-羟基苯甲酰肼分子进行了构型优化,得到了该分子的稳定几何构型,在此基础上对其频率进行了计算和指认,与4-羟基苯甲酰肼的实验谱图比较分析发现,真空分子的羟基、胺基及CH的特征振动频率与实验值相差较大。因此在单晶数据的基础上,增加一个氨气分子,模拟相邻分子对该分子的影响,MP2的计算结果表明,羟基的振动频率与实验值吻合很好,说明相邻分子之间的相互作用不能忽略以及MP2理论在解释该类分子的振动光谱方面具有较高的可靠性。The geometry of 4-hydroxybenzhydrazide was optimized using DFT/B3LYP and MP2 with 6-311＋G（d,p） basis set,the vibration frequency was calculated based on the stable structure at the same level,the normal modes were analyzed and the vibration frequencies were assigned.Compared with the experimental spectrum,it was found that the vibrational frequencies of hydroxyl,amino and C—H have significant differences between the experimental and the computational values.In order to explain the differences,a compound was obtained,in which a 4-hydroxybenzhydrazide molecule was substituted with ammonia molecule,to simulate the effect from neighbor molecules employing MP2.The results of calculation are in agreement with the experiment,which indicates that the interaction between molecules can not be ignored and MP2 is reliable on the investigating the vibration spectrum of the title compound.

关 键 词：4-羟基苯甲酰肼 红外光谱 简正振动分析 振动归属 

分 类 号：TQ421[化学工程] O657.33[理学—分析化学]