Microwave spectrum and structure of ethylene ozonide-D4

Abstract

Rotational spectra of six isotopic species of ethylene ozonide-D4 have been assigned. The Op---Op distance was calculated six independent ways using Kraitchman's substitution equations, and values between 1.458 and 1.462 A were obtained. This is in contrast to a similar analysis for normal ethylene ozonide where the Op---Op distance varied between 1.455 and 1.502 A. This difference is associated with the greater value of Ib-Ia for the D4 species which markedly decreases the effect of axes rotations upon isotopic substitution. The structural parameters derived from the D4 data set are in excellent agreement with those extracted from the H4 analyses after minimization of axes rotation effects.