title: Microwave spectra and structure of the argon-cyclopentanone and neon-cyclopentanone van der Waals complexes.
abstract: The rotational spectra of cyclopentanone and its van der Waals complexes with argon and neon have been observed with a Balle-Flygare type pulsed jet Fourier transform microwave spectrometer in the 6 to 20 GHz region. This work improves the rotational constants and quartic centrifugal distortion constants for cyclopentanone and its five (13)C and the (18)O isotopologues. The argon-(12)C5H8(16)O van der Waals complex has rotational constants of A = 2611.6688, B = 1112.30298, and C = 971.31969 MHz. The (20)Ne-(12)C5H8(16)O complex has rotational constants of A = 2728.8120, B = 1736.5882, and C = 1440.4681 MHz. In addition, the five unique, singly substituted (13)C and (18)O isotopologues of the argon complex are reported. The five single-substituted (13)C of the (20)Ne complex and the (22)Ne-(12)C5H8(16)O complex are reported. The rare gases are in van der Waals contact with the carbonyl α carbon and nearly in contact with the hydrogen on β and γ carbons toward the back of the ring.
authors.affiliation: Department of Chemistry and Environmental Sciences, University of Texas at Brownsville , One West University Blvd., Brownsville, Texas 78520, United States.
authors.forename: Wei
authors.initials: W
authors.lastname: Lin
authors.forename: Andrew H
authors.initials: AH
authors.lastname: Brooks
authors.forename: Andrea J
authors.initials: AJ
authors.lastname: Minei
authors.forename: Stewart E
authors.initials: SE
authors.lastname: Novick
authors.forename: Wallace C
authors.initials: WC
authors.lastname: Pringle