A heptazine, or tri-s-triazine or cyamelurine, is a chemical compound that consist of a triangular core group, C6N7, or three fused triazine rings.The general form is 1,3,4,6,7,9,9b-Heptaazaphenalene. The specific compound with three amino substituents is called melem. When heptazine is polymerized with the tri-s-triazine units linked through an amine (NH) link, it is called melon. The other melamine homologue, but not a heptazine, is the dimer melam, the fused product of 2,4-diamino-6-chloro-s-triazine with melamine. Melem, melon, and melam are effective flame retardant compounds. The compounds have in common that they melt or decompose at very high temperatures and that they are insoluble in any solvent. This makes characterisation difficult.J├Âns Jakob Berzelius first mentioned the heptazines in the 1830s when he discovered a polymeric substance after mercury thiocyanate ignition. Justus von Liebig named the polymer melon. Much later in 1937 Linus Pauling showed by x-ray crystal
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