Graphyne

Graphyne is an allotrope of carbon. Its structure is one-atom-thick planar sheets of sp and sp2-bonded carbon atoms arranged in crystal lattice. It can be seen as a lattice of benzene rings connected by acetylene bonds. The material is called graphyne-n when benzene rings are connected by n sequential acetylene molecules, and graphdiyne for a particular case of n = 2 (diacetylene links).

Not to be confused with Graphene, Grapheme, or Graphane.
Graphyne

Chemical structure of graphyne-1
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Depending on the content of acetylene groups, graphyne can be considered a mixed hybridization, spk, where 1 < k < 2, and thus differs from the hybridization of graphene (considered pure sp2) and diamond (pure sp3).

First-principles calculations showed that periodic graphyne structures and their boron nitride analogues are stable. The calculations used phonon dispersion curves and ab-initio finite temperature, quantum mechanical molecular dynamics simulations.

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