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Hexaaza-18-crown-6 is the macrocyclic ligand with the formula (CH2CH2NH)6. A white solid, this compound has attracted attention as the N6-analogue of 
Its protonated derivatives bind anions via multiple hydrogen bonds.{{cite journal , doi=10.1016/j.inoche.2008.01.028, title=Binding of Fluoro-Containing Anions to Hexaazamacrocyclic Ligand: Competitive Interactions of Fluoride and Tetrafluoroborate Anions with Hexaprotonated [18]aneN6, year=2008, last1=Fonari, first1=Marina S., last2=Ganin, first2=Eduard V., last3=Gelmboldt, first3=Vladimir O., last4=Basok, first4=Stepan S., last5=Luisi, first5=Brian S., last6=Moulton, first6=Brian, journal=Inorganic Chemistry Communications, volume=11, issue=5, pages=497–501
18-crown-6
18-Crown-6 is an organic compound with the formula 2H4O and the IUPAC name of 1,4,7,10,13,16-hexaoxacyclooctadecane. It is a white, hygroscopic crystalline solid with a low melting point. Like other crown ethers, 18-crown-6 functions as a li ...
. It functions as a hexadentate ligand in coordination chemistry
A coordination complex consists of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of bound molecules or ions, that are in turn known as ''ligands'' or complexing agents. Many ...
. It is the parent hexa aza-crown ether.
Its protonated derivatives bind anions via multiple hydrogen bonds.{{cite journal , doi=10.1016/j.inoche.2008.01.028, title=Binding of Fluoro-Containing Anions to Hexaazamacrocyclic Ligand: Competitive Interactions of Fluoride and Tetrafluoroborate Anions with Hexaprotonated [18]aneN6, year=2008, last1=Fonari, first1=Marina S., last2=Ganin, first2=Eduard V., last3=Gelmboldt, first3=Vladimir O., last4=Basok, first4=Stepan S., last5=Luisi, first5=Brian S., last6=Moulton, first6=Brian, journal=Inorganic Chemistry Communications, volume=11, issue=5, pages=497–501
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