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The molecular structure and pseudorotational motion of Bromocyclopentane (cas 137-43-9) has been studied at a nozzle temperature of 333K. A pseudorotational potential function of the form V(φ)=(V1/2)(1+cosφ)+(V2/2)(1+cos2φ), where φ is the phase angle, and V1=0.74(40)kcal/mol and V2=0.42(85)kcal/mol gave the best agreement with the experimental data. The conformer with cyclopentane adopting an envelope form with the bromine atom located in the axial position is more stable than the form with the bromine located in the equatorial site by 0.74(40)kcal/mol. The thermal averaged puckering amplitude, ρ, for the five-membered ring and the averaged C–C bond length were found to be 0.37(2) and 1.540(2)Å, respectively.
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