Microwave Spectrum, Barrier to Internal Rotation, and Quadrupole Coupling Constants of Cis-1-Chloropropylene
- 1 May 1964
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 40 (9) , 2705-2715
- https://doi.org/10.1063/1.1725584
Abstract
The microwave spectrum of CH3CH=CH35Cl and CH3CH=CH37Cl was studied in the region from 8–35 kMc/sec. The height of the potential barrier hindering the internal rotation of the methyl top is 620 cal/mole; the Cl quadrupole coupling constants are χaa35Cl= —19.66 Mc/sec and χbb35Cl=31.05. The dipole moments are μa=1.47 D and μb=0.72 D. The even greater lowering of the barrier, trans to cis, for the chlorine compounds as compared with the fluorine analogs supports the hypothesis of a nonbonded interaction between the halogen and the methyl hydrogen atoms.Keywords
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