  The presence in the graphyne sheets of a variable amount of sp2/sp1 atoms,
which can be transformed into sp3-like atoms by covalent binding with one or
two fluorine atoms, respectively, allows one to assume the formation of
fulorinated graphynes (fluorographynes) with variable F/C stoichiometry. Here,
employing DFT band structure calculations, we examine a series of
fluorographynes, and the trends in their stability, structural and electronic
properties have been discussed as depending on their stoichiometry: from C2F3
(F/C= 1.5) to C4F7 (F/C= 1.75).
