The discovery of linear SiC4 was reported in 1989 by
Ohishi et al. It was observed in
IRC+10216, where numerous other carbon-chain molecules
have been found, using the
Nobeyama Radio Observatory.
While pure carbon cluster species and their Si-terminated analogs
each form linear and cyclic structures, the cyclic forms of the latter have been easier to detect to date with
cyclic silicon dicarbide and
bicyclic silicon tricarbide both observed.
The only other linear SiCn species identified so far is simple diatomic
SiC, though species as large as
SiC8 have been created and studied in the laboratory.