...Structure and other Chemical Properties...

Blue = Nitrogen
Red= Oxygen
Gray= Carbon

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Above is the 3-D structure of quinine
Below is the 2-D structure of quinine

As seen above, the technical make-up of quinine is fairly complicated, with two benzene rings, including one nitrogen as one of the bonds. A string of carbon then connects it to another group of carbons. The bonds are all covalent.

Quinine is generally a white powder used in the form of a salt or sulfate. 

Obtaining Pure Quinine: 

To get pure quinine, the cinchona bark must first be mixed with lime juice (acidic), and then extracted with paraffin oil. It is filtered a few times, and then mixed and shaken with sulfuric acid. It is then mixed with sodium carbonate to neutralize the solution. Quinine sulfate as a crystal is the product. Ammonia is added to get the pure quinine by itself. 

Reaction Tendencies: 

Quinine is fairly stable, but it can do a few things...

• sublime in a high vacuum 

• give off a bluish luminescent light in diluted H₂SO₄

• Does not dissolve easily in water (1 gram dissolves in 1900 ml H₂O or 760 ml boiling H₂O) 

• It does, however, easily break down in alcohol and other carbon-based solutions

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