The Microwave Spectrum of C8H13Br and C8H13Cl

Abstract

The spectrum and structure of the molecules C₈H₁₃Br and C₈H₁₃Cl have been determined. Despite the large size of these molecules, the spectra can be analyzed with the exception of the quadrupole hyperfine splittings which cannot be resolved. The B values are 1090.9 Mc for Cl³⁵, 1065.9 for Cl³⁷, 725.9 for Br⁷⁹, and 718.5 for Br⁸¹. The value of the normal single bond carbon‐carbon distance is found to be d_c—c=1.545±0.004A. The angle of twist about the symmetry axis is φ=0°±4°, and the angle between the carbon‐carbon and carbon‐halide bonds is θ=109°50′±10′.