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I need to compare the IR SPECTRA for benzophenone and triphenylmethanol. The image below is from the IR spectra of my product ( supposed triphenylmethanol) that i got at the experiment. ......... ADVERTISEMENT ......... ..8..
♦ Relevant knowledge
Triphenylmethanol is a crucial chemical compound that can be used as an reagent in chemical labs. The most important application of this reagent is in production of triarylmethane-based dyes. The compound can also be used as an anti-proliferative drug.
Below is the IR spectrum for benzophenone
C=O at 1660 cm-1 is the main feature.
Below is the IR spectrum for triphenylmethanol
The O-H measuring 3470 cm-1 is the main feature.
Due to the same structural unit in triphenylmethanol and benzophenone, other peaks are very similar in both spectra. These include the aryl C=H stretching at 3060cm-1, the C=C ring stretching between 1440-1600cm-1, and the C-H bending modes at below 1000cm-1.
The IR spectrum of the precursor benzophenone, the alkyl-benzoate ester starting material (methyl oder ethyl) should be considered. Below is an example of the typical IR spectrum. The C=O stretching at 1726cm-1 is the main distinguishing feature.
The IR spectrum of your product shows a large C=O stretching peak at 1750 cm-1. Although it is not as high as the C=O stretching in benzophenone (1660cm-1) but it is close to that of alkyl benzoate ester (1726cm-1). This indicates that your product contains significant amounts of unreacted alkylbenzate ester.
Your product may also contain some benzophenone (C=O stretching peak of 1660 cm-1) and triphenylmethanol (3470 cm-1).