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4) What component of the caffeine structure allows it to be classified as an alkaloid? 5) What...

Question:

4) What component of the caffeine structure allows it to be classified as an alkaloid?

5) What bond vibrations and stretching frequencies should you observe in the IR spectrum of caffeine?

6) A 12 fl. oz can of coke has 46 mg of caffeine. If you extracted caffeine from 125 ml of coke, how much caffeine, in grams, would you expect to collect? (1fl. Oz 29.5 ml)

Infrared Spectroscopy and NMR

Infrared spectroscopy (IR) involves the interaction of infrared radiation with matter. Functional groups will behave (vibrate, stretch, flex, wiggle, basically move around) at different ranges on the spectra based on the type of functional group. This can be used to identify and study chemical substances.

The width and location of the peak in an IR is indicative of what functional group caused it. Alcohol and carboxylic acid peaks are very broad verses carbonyl peaks which are very narrow and sharp. Substituted benzene rings have peaks that correspond to the substitution pattern (Mono, para, meta, etc) in the fingerprint and overtone regions of the IR.

Answer and Explanation:

4)The caffeine structure contains nitrogens and having the properties of an organic amine base allows it to be classified as an alkaloid.

5)

...

Caffeine

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Infrared Spectroscopy & Molecule Identification
Infrared Spectroscopy & Molecule Identification

from AQA A-Level Chemistry: Practice and Study Guide

Chapter 2 / Lesson 13
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