Inorganic chemistry,diazines are a group oforganic compounds having themolecular formulaC₄H₄N₂. Each contains abenzene ring in which two of the C-H fragments have been replaced byisolobal nitrogen.^[1] There are threestructural isomers:

• pyridazine (1,2-diazine)
• pyrimidine (1,3-diazine)
• pyrazine (1,4-diazine)

• 6-membered rings with one nitrogen atom:pyridines
• 6-membered rings with three nitrogen atoms:triazines
• 6-membered rings with four nitrogen atoms:tetrazines
• 6-membered rings with five nitrogen atoms:pentazines
• 6-membered rings with six nitrogen atoms:hexazines

• Diazines
• Simple aromatic rings

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