Haeckelites

Haeckelites are three-fold coordinated networks of carbon atoms generated by a periodic arrangement of pentagons, hexagons and heptagons. They were first proposed by Humberto and Mauricio Terrones and their colleagues in 2000.^[1] They were named in honour of Ernst Haeckel, whose diagrams of radiolaria contained similar structural features. They have not yet been synthesised in the laboratory, but have been the subject of a considerable amount of theoretical work.

References

↑ H Terrones; et al. (2000). "New Metallic Allotropes of Planar and Tubular Carbon". Physical Review Letters. 84 (8): 1716–1719. doi:10.1103/physrevlett.84.1716.

Allotropes of carbon

sp³ forms	Diamond (cubic) Lonsdaleite (hexagonal diamond)

sp² forms	Graphite Graphene Fullerenes (Buckminsterfullerene, C₇₀, Higher fullerenes, Lower fullerenes, Nanotubes, Nanobuds) Glassy carbon

sp forms	Linear acetylenic carbon

mixed sp³/sp² forms	Amorphous carbon Carbon nanofoam Carbide-derived carbon Q-carbon

other forms	C 1 C 2 C 3

hypothetical forms	C 3 C 6 C 8 Chaoite Haeckelites Cubic carbon Metallic carbon Penta-graphene

related	Activated carbon Carbon black Charcoal Carbon fiber Aggregated diamond nanorod

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