The microwave spectrum of 1,3-cycloheptadiene has been studied. The ground state and a number of excited vibrational states have been assigned and the rotational constants evaluated. A study of the Stark effect has yielded the dipole moment components for the ground state and two of the excited vibrational states. The total dipole moment for the ground state is 0.740 D. These data have been used to determine the conformation of 1,3-cycloheptadiene. The carbon skeleton is planar except for the C6 carbon atom (Cs form).

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Lowfrequency vibrational spectra and conformations of bicyclo [3.2.0] hept6ene and 2oxabicyclo [3.2.0] hept6 ene J. Chem. Phys. 68, 3298 (1978); 10.1063/1.436136Microwave spectrum, structure, and dipole moment of 2,3,4,5tetracarbahexaborane (6)