Disilyne is a low valent silicon compound with the chemical formula Si2R2 where oxidation state of Si is +1.

Substituted disilynes contain a formal silicon–silicon triple bond and as such are sometimes written R2Si2 (where R is a substituent group).

[3] The term polysilyne can refer to the layer polymer (SiH)n or substituted derivatives.

The structure R′2R′′Si−Si≡Si−SiR′′R′2, where R′ = HC(SiMe3)2 and R′′ = HCMe2, is an emerald green crystalline compound reported in 2004.

Triple bonded compounds of the heavier members of group 14 have also been prepared; lead, [10] and tin[11] and germanium (digermyne)[12] The cores of the disilyne, digermyne, distannyne, and diplumbyne have similarly bent geometries.