Question

IR Spectrum of Benzophenone and Triphenylmethanol

I have partly labeled these two IR spectrums but need help making sure I did it correct and if I need to label any other important peaks corresponding to the structures. See underneath each picture for the labeled peaks and if they are correct/if I should label any others.

Benzophenone:

C-H stretch (aromatics) at around 3000-3100?

C=O strecth (ketone) at around 1700?

Any others that I missed that are important for me to label?

Triphenylmethanol:

O-H stretch at around 3400-3500?

C-H strecth (aromatics) at around 3000-3100?

Any others that I missed that are important for me to label?

Answer 1

Concepts and reason

The concept used is to interpret the IR spectra of benzophenone and triphenylmethanol.

Fundamentals

IR spectroscopy is the spectroscopy that involves the interaction of the infrared radiation with the substances.

This technique is used to identify the functional groups in chemical compounds.

Each functional group exhibits a characteristic absorption frequency.

The frequency of a vibration is directly proportional to the force constant and inversely proportional to the mass of the atoms.

Consider the IR spectrum of benzophenone.

A broad band of peak at corresponds to stretching of alkenes.

A strong sharp intense peak at corresponds to $C=0 $ stretching.

Medium intense peaks at (fingerprint region) correspond to aromatic benzene ring.

Consider the IR spectrum of triphenylmethanol.

A broad band of peak at corresponds to stretching (free).

A medium intense peaks at corresponds to alkyl stretching.

Medium intense peaks at (fingerprint region) correspond to aromatic benzene ring.

Ans:

The interpretation of the IR spectrum of benzophenone is as follows:

The interpretation of the IR spectrum of triphenylmethanol is as follows: