Meet diamondiyne, the new diamond-like carbon allotrope predicted 35 years ago

Porous diamond is the latest addition to the growing list of carbon allotropes. The new structure, termed diamondiyne, expands diamond’s rigid 3D lattice by incorporating alternating single and triple bonds between the connection points and is the only other carbon form capable of covalently bonding across all three dimensions. The unusual mix of sp and sp³ carbon centres may lead to unique optical and electronic properties, the full range of which have yet to be explored, say the authors.