What is "heptazine"

n. (context chemistry English) A chemical compound consisting of a planar triangular core group, C₆N₇, or three fused triazine rings, with three substituents at the corners of the triangle.

A heptazine, or tri-s-triazine or cyamelurine, is a type of chemical compound that consist of a planar triangular core group, CN, or three fused triazine rings, with three substituents at the corners of the triangle.

The general form is 1,3,4,6,7,9,9b-heptaazaphenalene. The parent compound CNH, where the three substituents are hydrogens, is called 1,3,4,6,7,9-hexaazacyc1[3.3.3]azine or tri-s-triazine proper.

Heptazines were discovered in the 19th century but their study has long been hampered by their general insolubility. They are used as flame retardants and have been the object of interest recently for potential applications in electronics materials, explosives, and more.