octatetraynyl radical

{{Short description|Organic radical (HC≡CC≡CC≡CC≡C•)}}

{{Chembox

|Watchedfields = changed

|verifiedrevid = 444112302

|ImageFile = Octatetraynyl radical.png

|ImageFile_Ref = {{chemboximage|correct|??}}

|ImageSize = 244

|ImageName = Skeletal formula of the octatetraynyl radical with the explicit hydrogen added

|PIN = Octa-1,3,5,7-tetrayn-1-yl

|Section1={{Chembox Identifiers

| index1_label=anion

|ChemSpiderID = 10809239

|ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

|PubChem = 57417316

| PubChem1 = 100986430

|SMILES = [C]#CC#CC#CC#C

|SMILES1 = [C-]#CC#CC#CC#C

| InChI1=1S/C8H/c1-3-5-7-8-6-4-2/h1H/q-1

| InChIKey1 = JPYHXIJMECKQLV-UHFFFAOYSA-N

|StdInChI = 1S/C8H/c1-3-5-7-8-6-4-2/h1H

|StdInChI_Ref = {{stdinchicite|correct|chemspider}}

|StdInChIKey = GTEOCQSGHJLKQX-UHFFFAOYSA-N

|StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

}}

|Section2={{Chembox Properties

|C=8 | H=1

}}

}}

Octatetraynyl radical ({{chem2|C8H}}) is an organic free radical with eight carbon atoms linked in a linear chain with alternating single bonds and triple bonds ({{chem2|H\sC\tC\sC\tC\sC\tC\sC\tC•}}).

In 2007 negatively charged octatetraynyl was detected in Galactic molecular source TMC-1, making it the second type of anion to be found in the interstellar medium (after hexatriynyl radical) and the largest such molecule detected to date.{{cite journal| journal=The Astrophysical Journal| volume=664 | issue=1 | pages=L47–L50 | date= July 20, 2007| title=Detection of C₈H⁻ and Comparison with C₈H toward IRC +10 216| first=Anthony J.| last= Remijan|author2=J. M. Hollis |author3=F. J. Lovas |author4=M. A. Cordiner |author5=T. J. Millar |author6=A. J. Markwick-Kemper |author7=P. R. Jewell |doi=10.1086/520704 |bibcode=2007ApJ...664L..47R|doi-access=free }}{{cite journal | journal= The Astrophysical Journal | issue=1 | volume=664 | pages=L43–L46 | date=July 20, 2007 | title=Detection of the Carbon Chain Negative Ion C₈H⁻ in TMC-1| first=S.| last= Brünken|author2=H. Gupta |author3=C. A. Gottlieb |author4=M. C. McCarthy |author5=P. Thaddeus |doi=10.1086/520703 |bibcode=2007ApJ...664L..43B| s2cid=120912943 | doi-access= }}