The highly polar ring-chain carbenes and formed by substituting either CN or CCCN HC 4 N HC 6 N, for a hydrogen atom in cyclopropenylidene were detected in a supersonic molecular beam with (c-C 3 H 2), a Fourier transform microwave spectrometer. Seven a-and four b-type rotational transitions of HC 4 N and 11 a-type transitions of each with resolved nitrogen nuclear quadrupole hyperÐne structure, HC 6 N, were measured between 6 and 21 GHz, yielding precise values for the three rotational constants, the leading centrifugal distortion constants, and the quadrupole coupling constants. Like the hydrocarbon carbenes and both new molecules have a planar ring-chain structures and singlet C 5 H 2 , C 7 H 2 , C 9 H 2 , electronic ground states. The strongest lines of can be detected with a signal-to-noise ratio HC 4 N exceeding 10 in a total integration time of less than 1 s, but the lines of were nearly 100 times HC 6 N weaker.
CITATION STYLE
McCarthy, M. C., Grabow, J. ‐U., Travers, M. J., Chen, W., Gottlieb, C. A., & Thaddeus, P. (1999). Laboratory Detection of the Ring‐Chain Carbenes HC 4 N and HC 6 N. The Astrophysical Journal, 513(1), 305–310. https://doi.org/10.1086/306851
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