Structure Data of Free Polyatomic Molecules
521
MW
C4H5FS
r0
S...H
Thiophene – hydrogen fluoride (1/1)
Cs
(weakly bound complex)
(effective symmetry class)
(large-amplitude motion)
Å a)
2.98(5)
θ0
ϕ b)
β b)
deg a)
65(1)
34(6)
Interpretation of the spectroscopic constants suggests
that the complex has a geometry of Cs symmetry, with
a long, weak hydrogen bond formed by HF to the
π-electron density in the region of the S atom.
a
) Uncertainties include that of αaz = 30 ± 5°.
) See figure for the definition.
b
Cooke, S.A., Corlett, G.K., Legon, A.C.: Chem. Phys. Lett. 291 (1998) 269.
Landolt-Börnstein
New Series II/28C
S . HF