Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Methyl Triacetylene

  • William M. Irvine
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_5104-1



Methyl triacetylene is the heaviest methyl polyyne (organic molecule with two or more sets of alternating single and triple bonds) thus far detected by radio astronomers in interstellar molecular clouds.


Methyl triacetylene joins a number of other carbon chain molecules identified in interstellar molecular clouds or the envelopes of carbon stars. These include nitriles up to H(C≡C)5CN, methyl polyynes, bare carbon chains up to C5, radicals up to C8H and the corresponding anions, and related species such as C4Si, C3O, and C3S (see Molecules in Space, where references to many initial detections are given). Polyacetylenes such as HC6H are also present, but, since their symmetry precludes a permanent electric dipole moment and hence pure rotational transitions accessible to radio astronomers, they have been observed through their vibrational transitions in the infrared.

See Also


Dipole Moment Bioorganic Chemistry Vibrational Transition Electric Dipole Carbon Chain 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of AstronomyUniversity of Massachusetts, Lederle Graduate Research Tower B 619EAmherstUSA