Prototype carbon nitrides similar to the symmetric triangular form of melon

Solid polymerization of 2,5,8-tricarbodiimide-tris-s-triazine potassium salt (potassium melonate) and 2,5,8-trichloro-tris-s-triazine (cyameluryl trichloride) gave a symmetric triangular form of a prototype carbon nitride which is deammonation-polycondensed with fifteen 2,5,8-triamino-tris-s-triazine molecules.