Rotational spectra and conformational analysis of 2-bromobutane
- Authors
- Jang, Heesu; Kim, Jihyun; Ka, Soohyun; Obenchain, Daniel A.; Peebles, Rebecca A.; Peebles, Sean A.; Oh, Jung Jin
- Issue Date
- 15-Mar-2022
- Publisher
- ELSEVIER
- Keywords
- 2-bromobutane; Chirped-pulse microwave spectroscopy; Conformational compositions; Relative intensity; Nuclear quadrupole coupling; Dipole moments
- Citation
- JOURNAL OF MOLECULAR STRUCTURE, v.1252
- Journal Title
- JOURNAL OF MOLECULAR STRUCTURE
- Volume
- 1252
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/145855
- DOI
- 10.1016/j.molstruc.2021.132148
- ISSN
- 0022-2860
1872-8014
- Abstract
- Y The rotational spectra of 2-bromobutane were obtained by using a chirped-pulse Fourier-transform microwave (CP-FTMW) spectrometer in the frequency range 8-18 GHz. Hyperfine structures of both bromine isotopologues (I = 3/2) for the three conformers (G+, A, and G-) have been investigated to determine the rotational constants, centrifugal distortion constants, and nuclear quadrupole coupling constants of bromine (Br). The conformational compositions for G+, A, and G- in the supersonic jet, estimated by relative intensity measurements, are 55%, 28%, 17%, respectively, for the Br-79 species, and 52%, 33%, 15%, respectively, for the Br-81 species. However, the small zero-point energy differences of isotopomers can be negligible and can be considered as an average value instead of individual values, which is 54%, 30%, 16% for G+, A, and G- species. The nuclear quadrupole coupling tensors (chi(xx), chi(yy), and chi(zz)) of Br and the quadrupolar angles were obtained, and the chi(zz) value of 2-bromobutane is compared with those of other alkyl bromides. The spectroscopic constants, r(s) coordinates of Br and the dipole moments of the most stable G+ conformer are predicted well from the ab initio calculations at the MP2/6-311++G(2d,2p) level. (C) 2021 Elsevier B.V. All rights reserved.
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