April 2016


Cyanotriacetylene or cyanohextriyne (HC7N) was initially detected by Kroto et al. in 1978 toward Heiles cloud 2, more frequently known as TMC-1 (Taurus Molecular Cloud 1). The observations were performed with the 46m telescope at the Algonquin Radio Observatory in Ontario, Canada. The initial detection was quickly confirmed by Little et al., who observed HC7N in TMC2, and by Winnewisser & Walmsley, who observed it in IRC+10216. Subsequent observations by Gardner et al., Rodriguez & Chaisson, Snell et al., and Cernicharo et al. extended the number of observed lines of HC7N and added new sources, including Sgr B2 and Ll544.

Cyanotriacetylene is the third member of the HC2n+1N family, which includes the cyanopolyynes (n≥2). Species in this family detected to date in space include: cyanoacetylene, HC3N, cyanodiacetylene, HC5N, cyanotriacetylene, HC7N, cyanotetraacetylene, HC9N, and cyanopentaacetylene, HC11N. Three more members of the series have been characterized only in the lab: cyanohexaacetylene, HC13N, cyanoheptaacetylene, HC15N, and cyanooctaacetylene, HC17N.

The Astrochymist homepage
Maintained by DE Woon