Electron‐Diffraction Study of the Structures of C2H4 and C2D4

摘要: The structures of ethylene and deuteroethylene were investigated by electron diffraction to resolve apparent discrepancies between earlier spectroscopic studies. Satisfactory agreement with the previous study was found for five six molecular parameters determined but a difference standard deviations encountered C–H bond length. Mean lengths errors C2H4 obtained in present investigation rg(CH)=1.1030±0.0018 A rg(CC)=1.3369±0.0016 A. Corresponding C2D4 rg(CD)=1.099±0.003 rg(CC)=1.338±0.003 Bond angles, corrected shrinkage effects, ∠CCH=121.4±0.6° ∠CCD=121.4±0.8°. new results are compared mean angles calculated from rotational constants taking rotation—vibration interactions into account. Excellent is found. Significant differences exist, however, conventional bond‐length derived spectroscopy an...