The Pyridine reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Pyridine

Pyridine is one of the simplest heterocyclic aromatic molecules, with the Hill system formula C₅H₅N.

Pyridine is structurally similar to benzene, with a single nitrogen atom substituting in the six-member aromatic ring for one of the carbon and one of the hydrogen atoms, as follows:

Pyridine is a base. Its conjugate acid is a unipositive polyatomic ion called pyridinium, C₅H₅NH⁺.

Under conditions of standard temperature and pressure, pyridine is a liquid with a strong odor.

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