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Structure Data of Free Polyatomic Molecules
268
MW
C 2 H 4 F4
Difluoromethane dimer
(weakly bound complex)
r0
C(α)...C(β)
H(1)...F(1)
H(2)...F(2)
H(3)...F(3)
Å a)
3.5469(19)
2.6462(83)
2.7715(45)
2.7715(45)
rs
C(α)–C(β)
Å
3.542(7)
θ0
b
α )
β b)
deg a)
7.91(43)
9.27(10)
Cs
(effective symmetry class)
(large-amplitude motion)
(CH2F2)2
The derived structure is consistent with a cooperative union in the dimer formed by three
hydrogen bonds.
a
) Estimated standard errors.
) See figure for the definition.
b
Blanco, S., López, J.C., Lesarri, A., Alonso, J.: J. Mol. Struct. 612 (2002) 255.
See also: Caminati, W., Melandri, S., Moreschini, P., Favero, P.G.: Angew. Chem. 111 (1999)
3105; Angew. Chem., Int. Ed. Engl. 38 (1999) 2924.
Landolt-Börnstein
New Series II/28B