红外谱图怎么鉴别是乙酸乙酯还是丙酸甲酯?

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The main ingredients of cellulose filter paper,filter paper from the infrared spectra of Figure 6 we can see that its display characteristics of a typical polysaccharide,containing a variety of complex functional groups,in the absorption peaks have been marked.In the 300 ° C when the product prepared by the infrared spectrum compared with the blank filter paper close to,but there have been some other product of functional groups,such as the wave number of 1583cm-1 when a hydroxy-(C = O) group of the overlapping absorption peaks,which is not fully decomposed acetate where the hydroxyl,in the wave number at 438cm-1 of zinc-oxygen bond absorption peak began to appear,but the intensity is very weak,indicating the temperature of the ZnO content is extremely low,which resulted in the adoption experiments and thermal analysis have also confirmed.
Curve can be seen from Figure 7,from the temperature reaches 400 ° C since the absorption peak of cellulose filter paper significant changes have taken place,some before reaching this temperature a strong peak,such as CO,CH,C-CH2-,-- CH2-has become very weak or completely disappeared,indicating at this time has been broken down cellulose ingredients.Temperature from 400 ° C to 1100 ° C process of change,in the wave number of 1583cm-1,has failed to appear carbonyl (C = O) group absorption peaks,indicating the carbonyl oxygen on the acetate group in the 400 ° C to has broken down completely.Temperature of 400 ° C to between 500 ° C when the wave number at 438cm-1 of zinc-oxygen bond absorption peaks become more obvious,but the strength is weak,the temperature raised to 600 ° C when the wave number at 438cm-1 of zinc oxide bond absorption peak significantly strengthened,in the heated to 700 ° C above the absorption peak intensity reached its peak and is basically the same,indicating 400 ° C to 500 ° C for the formation of ZnO,in the 600 ° C when the zinc oxide structure has basically taken shape,this zinc-oxygen bond absorption peak intensity changes show that as the temperature rises,zinc oxide group is gradually increasing.Wave number in the 3437cm-1,1631cm-1 absorption peak is the sample of water containing ingredients.

应该属于弯曲振动吧

3300cm-1左右有强峰----羟基缔合峰
1000-1200cm-1左右有强峰,为C-O伸缩峰

* 2724 cm-1显然不是sp3 C-H 伸缩振动峰.
* 没有羰基,不大可能是 Fermi 共振峰（一个低波数峰 + overtone）.
* 不是叠加峰（combination band).
剩下可能：
1.差值峰(difference band).

3400左右那个宽峰是羟基的氧氢伸缩振动.2900左右那组峰是sp2碳上的碳氢伸缩振动.1600左右那组峰是sp2碳碳伸缩振动.1030左右是碳氧伸缩振动.
苯酚.（也许有其他可能的）
你的谱图分辨率太差,精细结构都看不出来.建议你把样品仔细磨细一点重新做红外.

没有答案,真郁闷

在红外图上只出现677和2349两个基频峰,因为二氧化碳对称伸缩震动的偶极矩变化为零,不产生吸收,而面内变形和面外变形震动的吸收频率完全一样,发生简并.理论计算震动数为四,实际只有两个.3n－5=4