MICROWAVE SPECTRA OF THE 2,4-PENTADIYNE RADICAL, $H_{2}C-C\equiv C-C\equiv C-H$

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1998

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Ohio State University

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The H2C−C≡C−C≡C−H radical was produced in a pulsed discharge supersonic jet and studied by Fourier transform microwave spectroscopy. Four rotational transitions of the radical from Nupper=2 to 5 in the Ka=0 ladder were observed between 8 and 21 GHz. A total of 36 hyperfine components were measured and assigned. Seven spectroscopic constants, including rotational and centrifugal distortion constants, the spin-rotation constant, and hyperfine coupling constants for the methylenic and acetylenic hydrogens, were determined. These spectroscopic constants of 2,4-pentadiyne will be compared with those of its isoelectronic analog, H2C−C≡C−C≡N, and with those of the propargyl radical, H2C−C≡C−H.

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Author Institution: Harvard-Smithsonian Center for Astrophysics; Department of Chemistry, Wesleyan University; Harvard-Smithsonian Center for Astrophysics, Wesleyan University; Division of Engineering and Applied Sciences, Harvard University; Division of Engineering and Applied Sciences, Harvard University

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http://hdl.handle.net/1811/19172

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1990-1999