Microwave Spectrum, Internal Barrier, Molecular Structure, and Dipole Moment of Disilanyl Fluoride

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Abstract
The microwave spectra of five isotopic species of disilanyl fluoride (Si2H5F) have been studied in the region 12–38 Gc/sec. Several of the ground‐state transitions are split into doublets, some into triplets, due to the coupling of internal and over‐all rotation. Analysis of the splittings gives a barrier value V 3 = 1048±40 cal/mole. Rotational constants have been determined for molecules containing silicon−28, −29, and −30 isotopes in each position and have been used to calculate the following structure: Si – F =1.598±0.008 Å, Si – Si =2.332±0.005 Å, Si – H =1.483 ( assumed ), Si – H ( F )=1.477 Å ( assumed ), ∠ HSiH =180 ∘ 20 ′ ( assumed ), ∠ HSiH ( F )=110 ∘ 2 ′ ( assumed ), ∠ SiSiF =109 ∘ 30 ′ ±30 ′ , ∠ SiSiH ( F )=110 ∘ 22 ′ ±2 ∘ . Stark‐effect measurements yield μ A = 0.934 D, μ B = 0.850 D, and a total dipole moment μ = 1.26±0.01 D inclined at an angle of 10° to the SiF bond.