Table 1. Selected Geometrical Parameters of Parent and Brominated [2.2]Paracyclophanes 1–2a.
cyclophane | method | d (d′) (Å) | α/β (deg) | Φ (deg) |
---|---|---|---|---|
PCPb | calc | 3.08 (2.78) | 11.9/11.0 | 7.1 |
[3.08 (2.77)] | [12.2/11.5] | [17.6] | ||
expc | 3.10 (2.78) | 12.5/11.0 | 12.6 | |
1 | calc | 3.08 (2.78) | 12.0/11.3 | 17.0/11.0 |
p-2 | calc | 3.08 (2.77) | 12.0/11.5 | 17.9 |
m′-2 | calc | 3.08 (2.77) | 11.9/11.3 | 18.3/8.6 |
expd | 3.09 (2.76) | 13.6/10.0 | 20.6/10.1 | |
o′-2 | calc | 3.08 (2.77) | 12.0/11.5 | 18.0 |
expe | 3.08 (2.77) | 11.5/11.8 | 19.4 |
Selected structural parameters: d, the interplanar distance between the mean planes defined by the unbridged atoms of the (bromo)benzene unit; d′, the averaged distance of the two sets of the facing bridgehead atoms; α, the averaged deformation angle between the mean plane and the bridgehead atom; β, the additional deformation angle of the linker atom from the mean plane; Φ, the dihedral angle around bridgehead and linker atoms. Geometries were optimized at the DFT-D3(BJ)-TPSS/def2-TZVPP level. The values for SCS-MP2 geometry are within brackets.13
Parent [2.2]paracyclophane.
Ref (13).
Ref (22).
Ref (23).