The molecular structure of cyclopropylgermane from the rotational spectra of 41 isotopomers

摘要: Abstract The microwave rotational spectra of 41 isotopomers cyclopropylgermane, C 3 H 5 GeH , many them multiply substituted, have been measured, mainly by mw-mw double resonance. ground state constants were determined least-squares fits to the with fourth order centrifugal distortion included. A number methods, some recent origin, employed determine molecular structure cyclopropylgermane from large collection substitution data. results are summarized and compared: structures types r 0 1, ϵ = Δ1 B α Δ s -fit, m ρ . detailed structure, which was obtained no assumptions other than symmetry, is reported. Significant evidence for CC bond length disparity, germyl group tilt deformation, methylene deformation given. endo GeH two neighboring CH bonds longer more inclined towards each they would be without departure local bonding symmetry. This presumably due interaction between cyclopropyl ring substituent. electric dipole moment, essentially directed along CGe bond, has Stark effect measurements parent isotopomer, | μ a 0.684(7) D, b 0, c 0.261(8) |μ| 0.732(9) D. From several doublet transitions first excited torsion internal rotation hindering potential calculated as V 5.58(20) kJ/mole.