MICROWAVE SPECTROSCOPY OF TWO ISOELECTRONIC RADICALS: 2,4,6-HEPTATRIYNYL, $H_{2}C-C\equiv C-C\equiv C-C\equiv C-H$, AND 2,4-HEXADIYNYLNITRILE, $H_{2}C-C\equiv C-C\equiv C-C\equiv N$
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Date
1999
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Publisher
Ohio State University
Abstract
The isoelectronic pair of radicals 2,4,6-heptatriynyl, $H_{2}C-C\equiv C-C\equiv C-C\equiv C-H$, and 2,4-hexadiynylnitrile, $H_{2}C-C\equiv C-C\equiv C-C\equiv N$, were produced in a pulsed discharge supersonic jet and detected by Fourier transform microwave spectroscopy. Seven rotational transitions of the heptatriynyl radical from $N^{\prime} = 4$ to 10 and six rotational transitions of the hexadiynyl-nitrile radical from $N^{\prime} = 4$ to 9 in the $K_{a} = 0$ ladder were observed between 6 and 17 GHz. For each species, over 50 hyperline components were measured and assigned with an uncertainty of 5 kHz. Precise rotational, centrifugal distortion, spin-rotation, and various hyperfine coupling constants were determined for both $H_{2}C_{7}H$ and $H_{2}C_{6}N$.
Description
Author Institution: Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138; Division of Engineering and Applied Sciences, Harvard, Cambridge, MA; Department of Chemistry, Wesleyan University, Middletown, CT