K. Nair, David A. Dewald, D. Wachsmuth
May 1, 2017
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Journal
Journal of Molecular Spectroscopy
Abstract
Abstract The microwave spectrum of the cis form of aromatic 2,4-difluorophenol (DFP) has been recorded and analyzed in the frequency range of 5–25 GHz using a pulsed-jet Fourier transform microwave spectrometer. Rotational transitions were measured for the parent and all unique single 13 C substituted isotopologues and 18 O in natural abundance and on enriched deuterium species on the hydroxyl group. The rotational (MHz), centrifugal distortion (kHz), and quadrupole coupling constants (MHz) in deuterium species were determined. The rotational constants for the parent species are obtained as A = 3125.04158(43) MHz, B = 1290.154481(54) MHz, C = 913.197424(36) MHz, D J = 0.020899(162) kHz, D K = 0.9456(100) kHz, D JK = 0.09273(65) kHz, d 1 = −0.00794(14) kHz, d 2 = −0.002356(93) kHz and for the deuterated species A = 3125.38579(44) MHz, B = 1261.749784(48) MHz, C = 898.927184(27) MHz, D J = 0.02096(19) kHz, D K = 0.379(74) kHz, D JK = 0.0880(11) kHz, d 1 = −0.00691(11) kHz, d 2 = −0.00183(11) kHz. The deuterium quadrupole coupling constants are χ aa = −0.0109(33) MHz, and ( χ bb − χ cc ) = 0.2985(59) MHz. The r s substitution structure was determined using the measured rotational constants of the isotopologues, a nonlinear least squares fit was performed to obtain the best fit gas phase r 0 effective structure. Supporting ab initio (MP2) and density functional calculations provided consistent values for the rotational parameters, and molecular structure.