Aza-crown_ether
Aza-crown ether
Ring molecule with several amine (–N– or >N–) groups
In organic chemistry, an aza-crown ether is an aza analogue of a crown ether (cyclic polyether).[2][3] That is, it has a nitrogen atom (amine linkage, −NH− or >N−) in place of each oxygen atom (ether linkage, −O−) around the ring. While the parent crown ethers have the formulae (CH2CH2O)n, the parent aza-crown ethers have the formulae (CH2CH2NH)n, where n = 3, 4, 5, 6. Well-studied aza crowns include triazacyclononane (n = 3), cyclen (n = 4),[4] and hexaaza-18-crown-6 (n = 6).[5]
- 1,4,7-Trimethyl-1,4,7-triazacyclononane, a tridentate ligand used in coordination chemistry.
- 2.2.2-Cryptand is an aza-crown of the mixed ether-amine variety.