Features of 1,1-Difluoroethylene

Item Name: 1,1-Difluoroethylene
Molecular Formula: C2H2F2
CAS No.: 75-38-7
Features of 1,1-Difluoroethylene:
mw   64.03
mp  −144 °C(lit.)
bp  −83 °C(lit.)
density  0,617 g/cm3
vapor density  2.2 (vs air)
vapor pressure  518 psi ( 21 °C)
Fp  <-60°C

1,1-Difluoroethylene is a hydrofluoroolefin. Global production in 1999 was approximately 33,000 metric tons. It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride. Laser Stark spectra are given for 1,1difluoroethylene (H2CCF2) using laser λ = 337 μm. Three families of resonances are analyzed, two of them being the related transitions J(Ka, Kc) = 47(40, 8) ← 46(40, 7) and 47(40, 7) ← 46(40, 6). Relationships between the two transitions permit the calculation of both the zero-field transition frequencies and the effective dipole moment. A third family is assigned as 38(32, 7) ← 37(30, 8). The Stark shift is quasi-linear with E field, dominated by near-degenerate doublet interactions. Extended measurements and a reanalysis of the microwave spectrum are reported, in connection with the analysis of the far infrared spectrum.

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